There are yellow spots on the leaves of Chinese rose. White spots on Chinese rose leaves. If hibiscus is sick: Chinese rose diseases, treatment methods. Pest Control Measures

Hibiscus, which many indoor flower lovers keep in their home, is very pleasant and beautiful to look at. However, this plant, like any other, can suffer from diseases caused by pests, fungi or viruses, or improper care. The article will briefly describe the most common hibiscus diseases and their treatment at home.

The main mistakes in plant care

Hibiscus, also known as the Chinese rose, is not a very capricious plant, and it is rather unpretentious in its care. He forgives small flaws, but systematic violations of the temperature and water regime and other parameters he needs, of course, will not go in vain. The plant will begin to hurt, wither, and if nothing changes, it may even die.

To the most frequent mistakes hibiscus care include:

Violation of the watering regime, which can lead to rotting of the flower roots.
Watering the plant with contaminated or hard water that has not had time to settle properly.
Lack of spraying necessary for the flower, especially in the hot season.
Hot and dry indoor climate.
Leaves exposed to direct sunlight.
Bad light.
Drafts in the room.
Untimely transplant
Improper feeding - lack of nutrients or "overfeeding".
Dust and dirt on the plant.

Prolonged violation of the requirements for the care of the Chinese rose will certainly cause the development of home hibiscus diseases.

Diseases caused by improper care: sunburn

Yellow spots on the leaves may be due to sunburn. When choosing a place for a plant, you need to remember this. Usually the Chinese rose tolerates the sun's rays well, but if you put a flower accustomed to the shade in the bright sun, hibiscus leaf disease cannot be avoided. Dry patches appear on them. yellow color. They can also occur in those places that are pressed against the glass. To avoid this, experts recommend accustoming hibiscus to sunlight gradually. Affected leaves with dry patches will need to be removed.

It is also necessary to know that a change in the color of the leaves, the appearance of spots on them may be due to a lack of certain substances in the soil. For example, with a lack of an element such as zinc, the leaves can become speckled and crushed. If the edges turn brown, the plant lacks sulfur. Marbling of the leaves, in which white spots are noted between the veins, indicates a lack of magnesium. If the hibiscus lacks potassium, the leaves may begin to die off at the edges. In addition, the plant will not bloom well.

leaf chlorosis

Leaf spot, or chlorosis, can also be caused by a lack of nitrogen, magnesium, and their yellowing and falling off - a lack of iron in the soil. This is the so-called non-infectious chlorosis. The problem is solved by fertilizing, which should be regular, from spring to about mid-August, once every two to three weeks, and then, until the dormant period, once a month.

Iron deficiency can be compensated by adding iron chelate to the water for irrigation (5 g per 5 liters of water). The same solution is advised to spray the leaves. In total, it is desirable to carry out at least four treatments (every two weeks).

This hibiscus disease (photo can be seen below) can also be caused by pathogens - viruses, fungi, bacteria, which are often carried by pests.

In this case, the plant usually has an oppressed appearance. It is quite difficult to cure chlorosis in this case, since it is difficult to determine the causative agent of the disease. Therefore, it is easier to prevent it: provide good care, regularly wipe the leaves from dust and dirt, spray the hibiscus, replant it in a timely manner, changing the soil to a new one.

Vascular wilt hibiscus

It is impossible not to mention tracheomycosis when describing hibiscus diseases. This disease is quite dangerous and difficult to treat. It is called mushrooms. In this case, the branches first die off at the base, then the trunk is gradually affected, and the plant dies. How to save hibiscus? First of all, it is necessary to cut off all the affected areas, capturing a little and healthy tissue. After that, the plant is treated with one of the effective fungicides, for example, "Fundazol".

Diseases caused by pests: aphids

Describing the diseases and pests of hibiscus, it is necessary to mention the defeat of the plant by aphids. The leaves of the plant are deformed and become sticky. To get rid of insects, it is necessary to manually treat them with soapy water using a cotton swab, while making sure that it does not get into the soil if possible. After that, the hibiscus is sprayed with the Aktara solution. The treatment must be repeated at least once - in two weeks.

Spider mite damage

This is one of the main pests of hibiscus. Striking the leaves, he envelops them from below with a cobweb. Leaves curl and wilt. This pest feels great in dry, warm conditions, therefore, in order to prevent infection, it is necessary to monitor the cleanliness of hibiscus leaves and spray them regularly.

Help fight pests chemicals, such as "Aktellik", "Fitoverm", "Neoron". However, the peculiarity of this pest is that it quickly gets used to such drugs. Oddly enough, folk remedies can be more effective. Most often use soapy water, infusion of garlic, onion peel. To prepare the infusion, two heads of garlic are crushed and poured with water (1 l). Insist in a dark place for five days. Before use, the product is diluted in half with water and used to spray the plant.

For onion infusion, 100 grams of husk must be poured with five liters of water and infused for four to five days. Strain the infusion and use to spray the hibiscus.

It is advisable to periodically wipe the window sill on which the plant stands with a soapy solution as a preventive measure.

Whitefly defeat

This small flying insect should also be mentioned when describing ficus diseases and their treatment (a photo of the pest is presented below). It lives on the underside of hibiscus leaves. The leaves are covered with sticky spots and turn yellow.

To get rid of the whitefly, chemicals are usually used - Fufanon, Aktar, Iskra. Adult insects can be washed off with a stream of water, and the larvae, eggs and plaque can be removed with a swab of soapy water (100 g of crushed household, or better - tar soap for half a liter of water).

Why hibiscus doesn't bloom

The lack of flowering in hibiscus can be called a stretch of the eye, but it can spoil the mood of the grower for a long time. What can cause it?

The first reason is the lack of nutrients (in particular, potassium deficiency). The plant simply does not have enough resources to bloom. The second is the lack of lighting. Bright light is necessary for bookmarking buds. In order for the hibiscus to bloom, the time spent in the light must be at least four hours a day. The lack of flowers may be due to the fact that pruning was not carried out in a timely manner. It must be remembered that flowers form on young shoots. For their bookmarking, it will also be useful to replace the earth in the pot and carefully move the hibiscus to a more lit place.

In addition, the flower needs a dormant period from October to February. It is believed that in order for the Chinese rose to bloom, it is necessary to lower the temperature in the room to 15-18 degrees Celsius. Flower buds are laid under such conditions. Although cases of winter flowering of hibiscus are not uncommon. If the sun's rays penetrate well in the room, this is quite real.

In addition, hibiscus may begin to prepare for flowering and suddenly drop buds. Why is this happening? Experts note that during the flowering period, the Chinese rose should in no case be moved from place to place. Hibiscus generally does not tolerate permutations very well, and during flowering or preparation for it, when all the forces of the flower go to the formation of buds, and even more so.

Describing hibiscus diseases and their treatment (photos of some of them are presented in the article), it should be noted that the fall of the flower ovary can also be the result of damage to the hibiscus by a pest - gall midge, a miniature midge. She strikes the buds, laying her eggs in them. Naturally, the hibiscus will no longer bloom, the plant will shed its buds. If you can see that they have turned yellow, they must be carefully cut off and destroyed in order to prevent the spread of pests. The soil should be treated with Provotox, Grizzly or Mukhoed preparations, strictly following the instructions.

So, summing up, we can say that a dormant period in winter time, pruning, optimal lighting and timely top dressing. In addition, you should not often move the flower from place to place.

Finally

As you can see, indoor hibiscus diseases are quite diverse, and can affect all parts of the plant. Similar symptoms can be caused by both a violation of the rules for caring for a plant, and its damage by pests. In order to successfully treat hibiscus diseases (photos of some of them were presented in the article), you need to know what conditions should be provided to the flower, what drugs and in what dosage to use to get rid of pests, etc. This knowledge is the key to successfully growing a plant at home.

Foreword

Details about the ailments that affect hibiscus. Causes and symptoms of infection. Methods of prevention and effective ways control of diseases and pests.

Most of the diseases Chinese rose associated with improper care. And in second place in terms of the number of diseases and the frequency of their manifestation are cases of infection with fungi and pathogenic viruses. But, by the way, the defeat of a rose by most of these ailments also depends on the correctness of its cultivation. After all, when a plant does not receive proper care, it becomes weakened and, as a result, more susceptible to infection by fungi and viruses.

Chinese rose

Hibiscus is resistant to the vicissitudes of fate - it is not very dependent on how it is grown. It means that even serious flaws in caring for it cannot cause significant harm to the Chinese rose. However, this plant "forgives" such negligence only if they are allowed in a single amount. A systematic violation of any requirements of agricultural technology will certainly provoke certain troubles and diseases. Hibiscus will begin to feel bad at first (weaken), and then it will wither and get sick.

So, all currently known diseases of the Chinese rose can affect it due to the following care errors:

placing the plant in a draft, under the wind or direct sunlight;
excessive watering, resulting in rotting of the roots;
placement in a dry or hot room;
contamination and dustiness of the plant, especially its leaves;
lack of spraying or when they are extremely rare, especially in summer;
watering with poor quality water (containing a lot of harmful impurities or not settled);
poor lighting, and sometimes the turn of the flower with the back to the sun;
"overfeeding" with fertilizers;
lack of fertilizing with fertilizers and transplants;
allowing contact with already diseased plants, as a result of which the hibiscus is affected by diseases and pests.

All these violations in care, subject to their systematic impact on the Chinese rose, provoke various diseases in it. If this plant is provided with favorable conditions, or at least not injured by its careless attitude, then it grows for quite a long time and always pleases with its flowering every year from April to October, or even longer.

In most cases, the first signs of deterioration in health or disease of the Chinese rose are any changes in the condition of its leaves, as well as some of the other symptoms listed below. In each individual case, the plant may become unhealthy, usually for one of several reasons. The following are the main symptoms and the most likely causes that caused their appearance.

yellowed hibiscus leaves

If the hibiscus has leaves:

Turned yellow - the plant is infected with pests (spider mites or aphids), its roots turn white, leaf chlorosis, or the air in the room is not humid enough.
Turned yellow and fall off - stress (occurs when adverse factors occur or a sharp change in conditions of detention), drafts or insufficiently humid air in the room, and in winter also from waterlogging of the roots.
Fall off - insufficiently humid air in the room, stress, a sharp change in the intensity of lighting or drafts.
Wither at the tips - the plant lacks phosphorus and nitrogen, and also, most likely, some other nutrients.
Twisted into a tube - pest damage, most likely aphids.
They fall along with the flower buds - it is too hot in the room, the plant lacks potassium, or it is affected by a pest (midge gall midge).
Wither along with the whole plant - the room is too hot or the humidity is below critical levels for the Chinese rose.

What exactly is the cause of the appearance of most of these symptoms must begin to be clarified by identifying possible shortcomings in care. That is, we determine whether the temperature and humidity in the room, the frequency and amount of watering, as well as spraying and fertilizing with fertilizers required for hibiscus. Then, by the method of elimination, we determine the possible, and, most often, real causes. If they consist in improper care, then we eliminate the mistakes made. And how to deal with other causes will be discussed later.

The most common hibiscus diseases will be described below. Most of them are manifested in the change appearance leaves. Let's start with these ailments in order of their prevalence. Leaf diseases in the vast majority of cases are provoked by chlorosis. This is a disease in which the plant disrupts the formation of chlorophyll and reduces the activity of photosynthesis. The main characteristic signs of this disease in hibiscus are yellowing and/or leaf drop. Chlorosis is of two types - non-infectious and infectious.

Non-infectious rose chlorosis

Most often, the Chinese rose is affected by non-infectious chlorosis. The causes of its occurrence lie in malnutrition: insufficient or excessive supply of nitrogen, potassium, iron and magnesium. Moreover, it should be noted that magnesium and potassium are inherently competing elements. That is, an excess of one causes a deficiency of the second. Symptoms of non-infectious chlorosis in Hibiscus are as follows. With a lack of iron, the leaves turn yellow, and then the leaves fall off. If thinning of the branches is observed, the plant does not bloom at the right time, or its flowers have a pale color (not bright enough), then this indicates a potassium deficiency. When a rose lacks magnesium or nitrogen, the leaves become stained: yellow, whitish or lemon-colored.

Infectious chlorosis, as its name implies, affects the hibiscus due to its infection. The causative agents of this are fungal microorganisms, viruses and even pests. The symptoms of infectious chlorosis are as follows: yellowing and subsequent fall of the leaves, as well as general weakness and lack of flowering of the plant. Perhaps the next most common disease is sunburn. Signs of this disease are the appearance of white spots on the leaves, as in the photo. They result from the partial destruction of the chloroform of green tissues under direct sunlight. This usually happens with plants for which the light intensity has changed dramatically - they have been transferred from a less lit place or from a greenhouse to bright sun.

Vascular wilt is the result of infection of hibiscus with fungi of the genus Verticillium or Fusarium. With verticillosis, the leaves of the plant begin to curl from the bottom of the trunk and turn yellow. This process then moves up the stem. In a severely affected rose, only the very top will remain green. If the room is hot, then the leaves wither very quickly, not having time to curl, causing the plant to look like it has been scalded. Fusarium manifests itself in the slow wilting and subsequent death of the leaves without changing their color, that is, they remain green at the same time. The upper leaves may become watery at the edges, and some areas may acquire a pale green or light yellow tint. In both cases, after the defeat of all leaves, the trunk quickly dries up and the plant dies.

Bacterial spotting

Bacterial spotting is a disease, the manifestations of which can be observed not only on the leaves, but also on the shoots. Basically, this ailment in Hibiscus is caused by bacteria of this kind, such as Xanthomonas. This disease most often affects young shoots and leaves. Depending on the specific type of pathogen, the symptoms of the disease may vary slightly. The most characteristic and common picture is when watery yellow small spots first appear on the stems and leaves (seen in the photograph), which gradually turn black. The shape of the spots is most often irregularly angular, and a light green or yellow border is visible along their contour. The spots gradually increase in size and then merge. As a result, the entire sheet turns black. So the disease progresses throughout the plant and eventually it dies.

Another variant of spotting caused by bacteria is bacterial burn. Its causative agent is other bacteria belonging to the genus Pseudomonas. Most often, a bacterial burn begins with young shoots, leaves and flowers. Its symptoms are as follows. It is not spots that form on the plant, but immediately rather extensive shapeless blackening areas (as in the photo), which soon dry out. Outwardly, such areas on the sheet look as if it was burnt in this place. The progression of a bacterial fire first causes the plant to die separate parts and then his death. Under favorable conditions, this disease develops very quickly.

When affected by brown rot, the hibiscus stems turn brown and thin at the very base. The rose is greatly weakened and may die. Most often, this disease affects young seedlings and plants.

Most of the problems that have arisen with hibiscus are solved by normalizing the conditions of its maintenance and eliminating errors in care. Since the purpose of this article is not to consider exactly how to care for the Chinese rose, all these points will be omitted. Let us dwell only on the elimination of a number of specific omissions in care, indicated above in the chapter on the main symptoms of plant deterioration. In case of insufficient humidity in the room, the plant should be sprayed more often - not once, but several times a day. At the same time, waterlogging of the soil should not be allowed - so that after such a “shower” the water is already standing in a pot. If the Hibiscus is hot, then in the room with it, you should try to lower the temperature, and you should also shade it and spray it.

Chinese Rose Fertilizers

When a plant lacks some nutrients, then, of course, it is necessary to feed it with appropriate preparations, which include precisely the missing elements. If the roots become waterlogged in winter, then watering should be temporarily reduced in quantity and volume, and the plant itself should be sprayed instead, making sure, again, that less water gets into the soil and it does not turn into a liquid slurry. What to do in case of drafts is clear and so - it is necessary to eliminate the cause of their occurrence or move the Chinese rose to another, more peaceful place.

Now about the treatment of diseases. Non-infectious chlorosis can not only be defeated, but also prevented by regular feeding of Hibiscus with fertilizers. If, nevertheless, this misfortune happened, the emphasis should be placed precisely on those dressings that contain the missing elements. It should also be noted that the symptoms of iron deficiency (yellowing of the leaves) appear against the background of a lack of nitrogen and an increased content of chlorine and calcium in the water used for irrigation. Therefore, before watering, the water must be defended, and then a microfertilizer such as iron chelate should be added to it. The latter should be done if there is indeed an iron deficiency. And you need to monitor the sufficiency of the amount of fertilizing containing nitrogen.

Infectious chlorosis is best prevented. To do this, contact of the Chinese rose with diseased plants should not be allowed, it must be timely transplanted and fertilized, and it must also be regularly cleaned of dust and dirt. The latter is best done by washing the hibiscus in the shower. At the same time, the soil in the pot must be covered with cellophane. And yet, all new plants brought home must necessarily undergo a temporary quarantine procedure. That is, for several weeks they must be placed separately and away from existing flowers. In case of hibiscus disease, use appropriate preparations (designed to combat identified diseases and pests) to treat it.

To prevent sunburn, Chinese roses grown in greenhouses and growing in a darkened room should be accustomed to changing lighting gradually, taking them out in the sun for an hour and a half a day. Then we gradually increase the duration of the plants' stay in bright light, and only after full adaptation to it do we change their “place of residence”. If, nevertheless, the hibiscus got burned, it's okay. He quickly gets used to the change in lighting, and the leaves that have received burn spots simply fall off, giving way to new normal ones that soon grow.

Zircon for rose processing

Vascular wilt is very difficult to treat and it is not always possible to heal hibiscus from it. Often he quickly dies and at the same time it happens that he did not even have time to fall off the leaves. To fight this disease should be as follows:

We cut off all the affected (dried) fragments of the plant, while slightly capturing its healthy parts.
We process the whole rose with special antifungal compounds: Fundazol, Topsin, Dezavid, Alirin-R or others. You can also use the drug Rovral, the solution of which must be poured under the root. There are also folk remedy- spraying the plant with a solution Trichopolum(for 1 liter of water 2 tablets).
Additionally, you can stimulate the protective mechanisms of the rose by treating it with drugs. Appin, Zircon, House flower. You just need to make sure before that that the selected composition can be used in combination with the antifungal agent used.

If on initial stage failed to cure vascular wilt, and hibiscus continues to hurt and wither, it will have to be destroyed. Bacterial spot is remarkably cured by spraying the plant itself while watering the soil in the pot with a solution. Trichopolum(for 2 liters of water 1 tablet). Also effective are such well-known copper-containing preparations as copper sulfate and Bordeaux mixture. Not only for treatment, but also for prevention can still be used Fundazol, Euparen. To prevent damage by brown rot, hibiscus cuttings and seedlings must be treated with a means Rovral. In addition, seedlings should be planted shallow, and after planting, carefully sprayed with the same preparation.

When a plant is stressed, the first thing to do is try to figure out what caused it. If the reason is the onset of a strong deviation of the conditions of detention from those necessary for hibiscus, then it must be eliminated. The plant is unlikely to adapt to this, especially if the changes that have occurred are in principle unacceptable for its life. Stress can also occur due to the fact that the rose is greatly disturbed, for example, they often change her “place of residence” (they are constantly transplanted or transferred from one place to another, which usually happens during repairs and relocations) or do not monitor the behavior of children and pets that show excessive curiosity about houseplants.

Signs of Stress in Hibiscus

Such impacts on the plant must also be immediately stopped. In the first case, the hibiscus should, at least for a while, be left alone until it copes with stress (stop transplanting or choose the most suitable place for it, from which it will not need to be transferred for a relatively long time). In the second, to forever protect the plant from domestic "robbers", that is, for example, to find a place inaccessible to them.

Stress can also be caused by minor changes in the conditions of detention, when their main parameters are within acceptable values (associated with: transfer from one room to another or from a greenhouse to a permanent habitat; with slight deviations from the previous care), seasonal changes in environment(for example, a decrease in the level and duration of lighting in winter), any damage, transplantation or flowering (also stressful for young and weakened plants). In this case, no drastic measures will have to be taken.

Well, with the stress itself, the Chinese rose, as a rule, is able to cope on its own. In the first two cases, this will happen after the elimination of the causes that provoked it, and in the last - due to adaptation to new conditions. But in order for the plant to successfully and quickly cope with stress, it is necessary for it to provide peace, spray more often and more carefully monitor compliance with the schedule and norms of watering and feeding, as well as the quality of the water and fertilizers used for this.

In addition, hibiscus can be helped to stimulate adaptive processes in it with the help of anti-stress drugs, especially if the stress state does not go away for a long time and the plant is severely weakened. These include: Zircon, Fitosporin, Planriz, Epin-Extra, Planriz, Krezatsin. Such preparations have an immunostimulating and anti-stress effect on plants. It is necessary to choose and use the desired “drug” in accordance with the instructions for it.

Pests start on a plant in two cases: when they are transplanted into infected soil or as a result of contact with already diseased flowers. Hibiscus is most often affected by the following pests.

Aphid. This small insect settles primarily on young leaves and shoots, as well as on plant buds. It multiplies very quickly, creating entire colonies. It is able to completely destroy unopened flowers and young leaves, which at the initial stage of the lesion become sticky and deformed. It is necessary to fight aphids by treating the plant with drugs Akarin, Fitoverm, Biotlin, Intra-Vir, Decis. Also good help Nicotine sulfate and tobacco dust. On the early stages and in cases of a single partial defeat of the leaves, it is sufficient to confine the treatment to the usual soapy solution.

Signs of a spider mite

Spider mite. You cannot see this pest without a magnifying glass, especially since it settles at the bottom of the leaves. The latter, when struck by a tick, first fade and become covered with small yellow specks, which is clearly visible in the photograph. The pest envelops the underside of the leaves with a dense web, in which it lives. Subsequently, if measures are not taken immediately, extensive dried patches form on the leaves. The fight against a tick includes washing the leaves with soapy water or mineral oil and then treating the plant with preparations. Akarin, Lightning, Vertimek, Fitoverm.

Whiteflies. They usually hide on the underside of the leaves, where you can find their adults and pale yellow larvae (shown in the photo). A characteristic sign of damage to a plant by a whitefly is the appearance of a shiny sticky coating on the upper side of the leaves. These are pest excrements. After some time, sooty fungi develop in them, due to which the surface of the leaves becomes first white and then black. It is these fungi that can cause severe damage to the plant, and not the whiteflies themselves. In addition, this pest is a peddler of various viral infections. The symptoms of whitefly-borne diseases can be very different. This is chlorosis, and the leaves may turn yellow, deform, curl.

It is necessary to fight this pest by treating the plant with a solution of potassium soap or Aktara, Admiral, Biotlin, Bankol, Spark, Appleud, Fufanon, Tanrek preparations.

Worms. Signs of plant damage by them: waxy lumps and powdery coating appear in the axils of the leaves and on the cuttings. white color as in the photo. Methods of struggle: treatment with the same preparations as for the whitefly.

Shields and false shields. Signs of damage: pale brown or brownish rounded scales (tubercles) appear on the stems and leaves of the rose, which can hardly be separated from the plant. These are adults of the pest. With a slight lesion, we clean the scales with a cloth or a toothbrush dipped in a soapy or alcohol solution. A kerosene-soap emulsion also helps well. In case of severe damage, we use one of the above insecticides.

Midge gall midge. Signs of defeat: leaves and still unblown buds turn yellow and fall off. It is necessary to inspect the buds and identify all the affected ones. Small eggs of the pest will be visible in them. All these and yellowed buds must be cut off. They must not be allowed to fall to the ground. Then we cultivate the land with one of the above insecticides.

Hibiscus is a popular plant that can give its owner cause for concern. For example, when the tips of the leaves dry on a plant, and it gradually fades. This can happen if your hibiscus variegated is attacked by diseases and pests. In this article we will tell you why hibiscus leaves curl, what to do and how to treat a flower at home.

One of the reasons why the leaves of a houseplant begin to curl is pests. For example, a flower affected by a whitefly (whiteflies are one of the most dangerous pests) has yellow leaves covered with sticky drops over their entire surface. In addition to the whitefly, other hibiscus pests threaten the plant: aphids, gall midges and spider mites.

Aphids are another misfortune familiar to people who are fond of floriculture. Aphids are usually attracted to the fleshy shoots of the plant, so they attack it quickly and drink juices from it. One of the characteristic signs of the appearance of this pest is that the plant twists the leaves, and subsequently sticky droplets quickly appear on the leaves.

To combat aphids, the following methods are used: first they should be removed from the leaf and stem with a cotton pad, and then treated with soapy water or special preparations (Aktara, Iskra).

Gallica

Another reason why the leaf plate twists and falls off is the gall midge, which poses a threat to both the leaves and the root system of the plant. Usually, pest eggs can be found in the buds of a plant - it is there that worms hatch from the eggs, gnaw on the buds, and then fall into the soil, closer to the roots of the plant.

Diseases and their causes

In addition to the invasion of insects, your flowers can also be subject to diseases. Hibiscus diseases, if left to chance, can cause the death of the plant. Rotting roots, leaves starting to dry out - all this clear signs that the hibiscus needs help. It's not about various types rot when the plant has rotted or its roots have dried up, but about diseases that affect the condition of the foliage of the flower. So, let's look at the main leaf diseases and their treatment.

Chlorosis

Chlorosis is nothing more than the loss of leaves of their color. The leaves affected by the disease rapidly lose color and become very pale, even slightly yellowish. The disease is most dangerous because the leaves may not only lose their color, but over time they may begin to fall off. Thus, if you do not take any measures, soon your hibiscus may remain completely naked.

sunburn

Another misfortune that poses a significant danger, but in essence is not a disease, is sunburn. Everything is simple here: sunburn occurs as a result of violation of conditions of detention. Hibiscus, like the vast majority of plants, does not tolerate direct sunlight. Therefore, if you forget about it and place him in a place where he will be under their direct influence, be prepared to accept the consequences in the form of a sunburn.

Also, this misfortune can appear if you kept your plant in the shade for a long time, and then abruptly put it in a bright place. In this case, it is not even necessary that direct sunlight falls on it - a simple change of scenery will be enough. In addition, sunburn can occur even if the leaf seems to stick to the glass.

Sunburn looks like a small reddish or yellowish dry spot on the surface of the leaf plate. Measures to save the hibiscus are best taken immediately, because the longer you delay, the more rehabilitation the flower will then need.

Treatment and prevention

In order to fix the problems, you will need to cure the plant, saving it either from the invasion of insects or from diseases. If in the case of insects it will be enough to use any effective insecticide or acaricide (and for those who like to use folk remedies - a soapy solution), then with diseases you need to act a little differently.

With chlorosis, it is necessary to treat the hibiscus with iron chelate and apply the necessary fertilizers (since the disease itself is often due to a lack of nutrients). In addition to improving the conditions of detention, you will not help the plant in any way.

In order to eliminate the effects of a sunburn, you need to remove all damaged hibiscus leaves, as well as optimize the conditions of detention - for example, put in a darker place.

To keep your hibiscus leaves safe and sound, follow these simple guidelines:

In this video, an expert will talk about how to save indoor plants from pests and diseases.

With a small circle of friends, we were once lucky enough to have hibiscus trees at home - each has one tea rose in the most prominent place. Hibiscus has always shown itself to be an obedient flower, it was pleasant to deal with it, it did not get sick and was not capricious, but recently I noticed that hibiscus began to get a little sick, so I had to look through all possible diseases in order to exclude inappropriate options and still find the root of the problem.

Hibiscus diseases can be caused by several factors: poor care, changing weather conditions (this is especially true for garden hibiscus), as well as damage by viruses and pests.

Hibiscus diseases, as I know, can be attributed to dark spots on the sheets. The darkening of some sections of the hibiscus leaves by a fungus that affects the plant against the background of any changes is caused, simply - a weak plant is an easy prey for the fungus to colonize new territories. To cure hibiscus from this scourge, you need to carry out constant processing of the leaves of the plant. There are special fungicidal preparations that are excellent at fighting the problem, as well as laundry soap available at home, which, by the way, copes with most pests. It is necessary to exclude excessive moisture in the air or soil in order to prevent fungi from actively developing.

Hibiscus can also be affected by mold. You may have noticed the first white coating on the lower leaves of the hibiscus, but not to betray this until the mold began to spread to large areas of the hibiscus, and its general condition left much to be desired. Mold can be fought according to the same principles as with a fungus, only during the treatment period it is important to exclude top dressing, since active fertilizers will act in a completely unexpected way.

Viral infection. This disease is very complex, it is similar in symptoms and development to human cancer, although it is transmitted virally. You may notice yellow stripes on the leaves - these are the places where the infection occurs, after which the hibiscus roots will rot. In a couple of months, the plant will “burn out” and you will no longer be able, unfortunately, to enjoy its pleasant flowering and useful properties. The fight against a viral infection is fundamentally different from other methods of treatment: you need to completely destroy the plant, and remove the soil and the pot in which it was located. The key answer to the question “why should I do this?” there will be a viral infection. You run the risk of infecting other plants that bloom harmlessly nearby. In addition, if you want to propagate or replant, purchase hibiscus, for some time it cannot be put on the place of the old hibiscus's former habitat - after all, a virus, after all, is a serious matter.

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Why does indoor hibiscus not bloom?

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Hibiscus is a fairly hardy plant and can forgive some care mistakes. But, despite this, agricultural technology in the cultivation of the "Chinese rose" is very important and its non-compliance leads to pest infestation and disease development.

Chlorosis - this is a disease in which the green parts of the plant change their color to yellow, lemon or whitish due to a decrease in the amount of chlorophyll. This disease is non-infectious and infectious.

Non-infectious chlorosis appears with violations in the nutrition of the plant: lack or excess of nitrogen, magnesium, potassium, iron. Potassium and magnesium are inherently competing elements. An excess of one leads to a deficiency of the other. Potassium is essential for flowering plants. With its deficiency, the plant does not bloom, or the flowers are slightly colored, and the branches are thin. Magnesium deficiency leads to chlorosis. Iron deficiency also causes yellowing and leaf fall. In order to prevent this, the water for watering the plant must be defended and iron chelate added to it.
infectious chlorosis caused by viruses, fungi and pests. Dust removal, timely fertilization, transplanting and pest control will help to avoid these diseases.

Sunburn. Direct sunlight, falling on a plant that has not yet adapted, partially destroys chloroform in them, as a result of which the leaves become covered with white spots of burns. This temporary phenomenon is observed if the flower was moved from a greenhouse or a place with a lack of consecration to the bright sun. The hibiscus quickly adapts to changes in light and new leaves will grow back normally. To avoid the loss of decorativeness and not to injure the plant, it must be accustomed to change by taking it out into the sun for an hour a day, gradually increasing the length of stay.

Diseases caused by pests

Greenhouse and tobacco whiteflies. When the plant is affected, its leaves turn yellow and become covered with sticky secretions. Pale yellow larvae or adult white-winged insects can be seen on the underside of the leaves. To combat and prevent the disease, the plant is treated with potassium soap solutions or Biotlin, Fufanon, Aktara, etc.

Spider mite (web on hibiscus). In the affected plant, the leaves fade and become covered with yellowish specks. Subsequently, extensive dried areas appear on them. The underside of the leaves is covered with a web in which the pest lives. To combat and prevent the disease, it is necessary to wash the leaves with soap or mineral oil, and also treat with Lightning, Fitoverm, Akarin, etc.

Aphid. Aphids are attracted to the young leaves and buds of the plant. When damaged, they deform and become sticky. For the prevention and control of the disease, the plant is treated with soapy water, tobacco dust, Biotlin, Akarin, Decis, etc.

Worms. White waxy discharge appears on the petioles and in the axils of the leaves. To combat the disease, the plant is sprayed with Aktofit or treated with mineral oils.

Shields and false shields. Brownish or pale brown tubercles appear on the stems of the plant. With a small damage to the plant, the pests are removed mechanically, and the affected areas of the plant are wiped with kerosene or mineral oil. With severe damage, the plant is best treated with an insecticide.

Bacterial spotting. The edges of the leaves of the affected plant are covered with rotting yellow spots. For the prevention and treatment of the disease, the plant is systematically examined and treated with Fundazol, Cumulus, Euparen, etc.

Brown rot. Most often affects young plants and seedlings. In the affected plant, the stems turn brown and thin at the very base. To prevent the disease, cuttings and seedlings are treated with Rovral. Seedlings should be planted shallow, spraying thoroughly after planting.

Vascular wilt. Called by fungi. In the affected plant, the branches and trunk rapidly dry out, sometimes not having time to lose foliage. To treat the disease in the affected plant, the damaged parts are cut out and treated with an antifungal drug.

Midge gall midge. In affected plants, the buds turn yellow and fall off without even blooming. Midges midges lay their eggs in tiny hibiscus buds, so to prevent the disease, yellowed buds are collected, preventing them from falling, and the soil under the flower is treated with a preparation from soil pests.

Symptoms of diseases

Hibiscus leaves turn yellow. The most likely causes of the disease are pest damage (aphids, spider mites), diseases of the root system, insufficient air humidity or leaf chlorosis. The causes of chlorosis is the excess of the content of chlorine and calcium in the water for irrigation with a lack of nitrogen and iron. Water for watering the plant should be defended and iron chelate added.

Hibiscus leaves are falling. Stress, lack of moisture. It is necessary to create peace for the plant and spray.

Indoor hibiscus - leaves turn yellow and fall off. Stress, insufficient humidity, draft, waterlogging of the roots in winter. It is necessary to create peace for the plant, spray it, making sure that the kidney does not turn into a liquid mess.

Why do hibiscus leaves curl?. The plant is affected by aphids. Needs to be treated for pests.

Hibiscus leaves wither. Nutrient deficiencies. It is necessary to feed the plant with nitrogen and phosphorus preparations.

Withering hibiscus. The plant is too hot. It is necessary to reduce the temperature in the room, shade, spray.

Why do hibiscus drop buds? The plant is too hot. The soil lacks potassium fertilizers. The buds are affected by the midge gall midge.

What to do if he dies?

If your Chinese rose is sick, do not despair, it may be possible to resuscitate it. Hibiscus is unpretentious, and it is quite possible to treat it at home.

At the moment, many preparations have been developed for pest control, they can be purchased at specialized stores or use folk methods by treating the plant with a solution of soap, tincture of tobacco or pepper.

Folk remedies for hibiscus pest control

Pepper tincture (from aphids, ticks) - Dry pepper is poured with water in a ratio of 1: 2 and boiled for an hour, then insisted and filtered. For spraying a plant, 10 g of the drug is diluted in one liter of water and soap. Soap should be taken about 5g per liter.

Tobacco tincture (from aphids, thrips, ticks) - 1 kg of tobacco dust or tobacco is boiled in 10 liters of water for two hours. Insist for two days and filter. Before use, the concentrate is diluted in 10 liters of water with 50 g of soap.
Soap solution. To prepare the preparation, 200 g of potassium soap is diluted in 10 liters of water.
Mustard tincture (for ticks, aphids) - 50g of mustard is boiled in a liter of water and insisted. Before use, the concentrate is diluted in 20 liters of water.

Agricultural technology is of great importance when keeping hibiscus: soil acidity, heat and light conditions, air and soil humidity. Create comfort for the flower: do not move, treat pests, loosen the soil and water once a week and gradually the hibiscus will grow new leaves.

Photo

Known to most lovers of indoor flowers, the Chinese rose or hibiscus (Hibiscus rosa-sinensis) is considered an exquisite and luxurious plant and is grown by many flower growers at home. This indoor pet attracts attention with its unusually bright and large red, pink, lilac, yellow or white flowers against the background of juicy rich green foliage.

Hibiscus is a capricious plant, it is necessary to care for it strictly according to certain rules. Indeed, with the slightest change in favorable conditions, the Chinese rose responds with the loss of its decorative qualities. Then suddenly the leaves begin to turn yellow, and then a real leaf fall happens. This behavior of an indoor flower must have an explanation. It is possible that this is due to a disease or the appearance of pests, or maybe the hibiscus is under stress. It is important for the flower grower to quickly establish the cause of the negative changes and take urgent measures to save the plant.

Violation of the irrigation regime

Hibiscus over the age of four to five years needs daily in large numbers irrigation water, as required by its root system. Between waterings, the soil flower pot should not be wet, but always slightly moistened. An excess of moisture in the soil can lead to compaction of the soil and poor air permeability, which will lead to rotting of the root part and waterlogging of the soil surface.

In stagnant water and marshy soil, favorable conditions are created for the appearance of harmful bacteria and various fungal diseases. Under such conditions, the root system of the plant begins to slowly die. She no longer has enough nutrients for the growth and development of the flower, so the leaves begin to turn yellow and gradually fall off. This process must be stopped at an early stage, then the hibiscus can still be saved.

Usually a young plant can not cope with abundant watering. It is recommended to urgently remove it from the flower container, rinse the roots, all rotten and blackened parts must be completely cut off. Then it is necessary to treat all the places of cuts and the remaining roots with fungicides, sprinkle with Kornevin and transplant indoor flower into a new flower container and a fresh substrate. Immediately after planting, it is necessary to spray the entire crown of the Chinese rose with a solution based on Epin.

In an adult hibiscus, the foliage often turns yellow and falls due to a lack of moisture in the soil. Constant overdrying of an earthen coma depletes not only root system, but leads to wilting of the entire leaf mass. In that case save indoor plant almost impossible.

Insufficient lighting

The rose can thrive in full sun and grows well in shady conditions. But sudden changes in light levels (for example, moving hibiscus from outdoors to indoors and vice versa) can lead to yellowing and loss of foliage.

When a flower moves into a poorly lit room, it is necessary to use fluorescent lamps and illuminate it for some additional hours a day to prevent the plant from falling into a stressful state. When transferring hibiscus from the house to the street, it is very important not to immediately put it in direct sunlight, but to do it gradually. First, you need to shade the flower at noon and protect it from sunburn.

Violation of the temperature regime

Chinese rose prefers to be kept in warm conditions with a temperature of 18 to 30 degrees Celsius. Lowering and raising the temperature beyond these limits adversely affects the plant. It is also not recommended to allow cold drafts and sudden changes in temperature. In a cool room, you need to put a heater, and in a hot room, use spraying and raise the humidity level.

When fertilizing the soil with indoor plants, you need to know exactly which nutrients are important for a given specimen. An overabundance or lack of certain substances can harm a pet. For example, elements such as magnesium and potassium are very important for the development of hibiscus and should be present in an increased amount. But a large amount of nitrogen and phosphorus can cause a discoloration of the leaves and lead to complete yellowing. There is even such a thing as a “nitrogen burn”. That is why experienced flower growers recommend choosing such dressings that contain a lot of potassium, and without nitrogen-containing and phosphate fertilizers, the Chinese rose will not disappear. The nutrient mixture should only benefit the indoor flower.

Pests

One of the most dangerous and common hibiscus pests is the spider mite. It is almost impossible to notice its appearance at first. The leaves of a houseplant turn yellow, wither and begin to fall off actively and in large quantities, and it is not immediately possible to understand that the cause is the appearance of a pest. Only after some time, with the naked eye, you can see small black dots (with barely noticeable movement) on thin threads of the web.

There is no way to do this without the help of various chemicals. Specialized retail chains for gardeners and florists offer drugs such as Fitoverm, Aktara, Aktellik to combat spider mites. With their help, the crown of the shrub and the whole plant as a whole are processed.

The appearance of the disease - chlorosis

This disease is capable of completely destroying the plant in a short time. First, the leaves die, and then gradually the shoots and the whole flower. Hibiscus suffers from chlorosis when the soil is moistened with hard irrigation water, with a large amount of alkali in the soil, with an insufficient amount of fertilizers and fertilizing, as well as with a lack of iron. You can save an indoor flower by transplanting it into a new soil mixture and adding iron fertilizers to it.

natural causes

Some houseplant lovers begin to panic even if one or two leaves have fallen from the hibiscus, or they have turned a little yellow. This happens when the hibiscus is actively developing, it has a lot of new leaves, and the old ones die off. There is nothing terrible in this process, natural changes occur in wildlife.

Prevention of hibiscus diseases and preventive pest control measures (video)

Hibiscus, otherwise known as Chinese rose, is a popular ornamental plant with beautiful bright flowers. At the moment, many varieties have been bred that take root well at home and grow well. Hibiscus, room care at home, which is produced according to all the rules, will delight the owners of the house with its flowering for a long time. So, what should be the care of indoor hibiscus at home?

Who first decided to call the Chinese rose that way is not known for certain. Since ancient times, there have been various signs relating to plants. Some superstitions promise good luck, others are not so optimistic. So why is hibiscus called the flower of death? However, this is not the only plant that has fallen into such an unfortunate list, except for the Chinese rose, ivy, calla are considered deadly, and according to popular beliefs, all these plants bring death to the house.

Hibiscus has different meanings. If the plant suddenly blooms, this is a sign of the imminent death of one of the household members. Dropping leaves promises serious illness and trouble. Probably, once such coincidences really happened, because of which the flower gained notoriety. However, in Soviet and current years, this is a very popular plant in city apartments, behind which no ominous manifestations have been noticed.
Can you keep hibiscus at home? Absolutely yes. Flowers, leaves and fruits of hibiscus are not poisonous, which means that superstitions have no convincing basis.

Optimal temperature

How to care for hibiscus? The Chinese rose loves warmth, so for its comfortable existence it is necessary to maintain a temperature not lower than 18 and not higher than 22 degrees Celsius. However, hibiscus blooms in a cool period at + 15º C. Therefore, after the summer months, it is better to take the flower to a cooler place without bright sunlight. In summer, a pot with a plant can be kept on a veranda in the garden or on the balcony of a city apartment. Chinese rose loves fresh air, but it should be protected from drafts.

What lighting to choose

Hibiscus loves not only warmth, but also the bright sun. For this reason, it should be kept in the southern rooms. If it is too hot, the plant should be removed from the windowsill away from the glass or covered to protect it from the sun. Alternatively, flowers can be placed on a table by the window, where there is enough light, but the sun's rays are no longer so aggressive and will not damage the delicate hibiscus petals.

The lack of light is one of the reasons why hibiscus leaves turn yellow and fall off, and in some cases buds. What to do in such a situation? It is enough to provide the plant with access to good lighting.

How to water

Hibiscus requires timely watering, apart from constant spraying. Without enough moisture, it can dry out. You need to water the flower with water only at room temperature; before watering, the water should settle in glass containers with a wide mouth. If the apartment is too hot, moisture will quickly evaporate from the ground. To prevent this from happening, you need to use devices to reduce evaporation or cover the ground with ordinary moss.

In order for the leaves to be green and healthy, they need to be sprayed regularly and the air in the room must be kept sufficiently humid. To do this, you can use humidifiers or simply put water containers on the batteries. When spraying the leaves, you can not touch the flowers, they must remain dry. Periodically, the plant needs to be washed in the bathroom, washing away dust and dirt from the leaves. To prevent water from leaking into the pot, cover it with a plastic bag.

If the leaves turn black, this is a sign of excess water. To save the plant, it must be taken out of the pot along with an earthen clod and put to dry for 12 hours. Then it is worth cutting off the rotten roots and transplanting the flower into fresh soil.

Difficulties in Growing Hibiscus

hibiscus is enough unpretentious plant, so even if you make a mistake somewhere when leaving, it can be quickly corrected. Those who have only recently acquired a Chinese rose often wonder why the leaves of the hibiscus turn yellow, begin to dry out or fall off. This problem is easily corrected by spraying more frequently once you notice that the leaves have become limp. In addition, the plant itself sheds leaves after flowering - this is completely normal.

If the flower is withered, this may be a sign of too cold ground. From hypothermia, the leaves may also turn black. The plant must be returned to a warm place and do not forget about abundant watering. If everything is done in time, hibiscus can still be reanimated.

Why do hibiscus leaves turn yellow and fall off? Such a problem may indicate poorly filtered water. If the leaves are not only yellow, but also with brown edges, this means that there is little nitrogen in the ground. When temperatures and humidity fluctuate dramatically, a stressed plant sheds both leaves and buds. However, then it is restored and grows new leaves.

How to plant Angel Wings

Pests and diseases

Hibiscus Chinese, like any other indoor plant, is faced with various diseases and pests. If the care of hibiscus at home is timely, it helps to avoid trouble. However, even when good care, mites, aphids or some diseases may appear, which can be a headache for beginner gardeners.

Spider mites

All dry flowers and leaves must be removed in time. If preventive measures were unsuccessful, to get rid of the tick, more frequent watering and spraying is needed. In this case, the pot of the plant must be completely covered with polyethylene so that the moisture does not evaporate. Spider mites die in too humid conditions.

Aphid

In a small amount, aphids are not dangerous, but if there is too much of it, the leaves will begin to turn yellow, curl up into a tube and fall off sooner or later. The plant itself will be sluggish in appearance and stop blooming. If there are too many aphids, sticky secretions of these insects will be visible on the leaves.
While there are few aphids, the leaves can simply be washed with soapy water. If the insects have already settled down on the Chinese rose, only spraying will help here. by special means. After using chemicals, the plant will need more thorough care until it is fully restored.

leaf chlorosis

This disease is typical for hibiscus. Chlorosis occurs due to improper care of the flower. Signs of the disease:

change in the shape of the leaves;
the appearance of brown spots;
dry petals;
buds do not bloom and fall off.

Chlorosis indicates deficiencies in useful trace elements - manganese, potassium, zinc, etc. The plant can be saved by transplanting it into fresh and well-fertilized soil. In addition, daily spraying is necessary. If the disease has begun recently, it is enough just to fertilize the soil.

Indoor hibiscus is not capricious in care, and therefore both experienced growers and beginners can grow beautiful flowers. Large bright flowers will decorate the room and will please the eye for a long time. Such a flower can become not only an interior decoration, but also a good gift for relatives or friends.

Foreword

Chinese rose, also known as hibiscus, is quite unpretentious, but it also has its enemies in the form of various pests and diseases that annoy it. Knowing about the causes of damage to any ailments, you can completely prevent the disease of this plant. And if such an attack has befallen a Chinese rose, then you need to know about how to deal with it.

Most of the diseases of the Chinese rose are associated with improper care for it. And in second place in terms of the number of diseases and the frequency of their manifestation are cases of infection with fungi and pathogenic viruses. But, by the way, the defeat of a rose by most of these ailments also depends on the correctness of its cultivation. After all, when a plant does not receive proper care, it becomes weakened and, as a result, more susceptible to infection by fungi and viruses.

Chinese rose

So, all currently known diseases of the Chinese rose can affect it due to the following care errors:

placing the plant in a draft, under the wind or direct sunlight;
excessive watering, resulting in rotting of the roots;
placement in a dry or hot room;
contamination and dustiness of the plant, especially its leaves;
lack of spraying or when they are extremely rare, especially in summer;
watering with poor quality water (containing a lot of harmful impurities or not settled);
poor lighting, and sometimes the turn of the flower with the back to the sun;
"overfeeding" with fertilizers;
lack of fertilizing with fertilizers and transplants;
allowing contact with already diseased plants, as a result of which the hibiscus is affected by diseases and pests.

yellowed hibiscus leaves

If the hibiscus has leaves:

Turned yellow - the plant is infected with pests (spider mites or aphids), its roots turn white, leaf chlorosis, or the air in the room is not humid enough.
Turned yellow and fall off - stress (occurs when adverse factors occur or a sharp change in conditions of detention), drafts or insufficiently humid air in the room, and in winter also from waterlogging of the roots.
Fall off - insufficiently humid air in the room, stress, a sharp change in the intensity of lighting or drafts.
Wither at the tips - the plant lacks phosphorus and nitrogen, and also, most likely, some other nutrients.
Twisted into a tube - pest damage, most likely aphids.
They fall along with the flower buds - it is too hot in the room, the plant lacks potassium, or it is affected by a pest (midge gall midge).
Wither along with the whole plant - the room is too hot or the humidity is below critical levels for the Chinese rose.

The most common hibiscus diseases will be described below. Most of them are manifested in a change in the appearance of the leaves. Let's start with these ailments in order of their prevalence. Leaf diseases in the vast majority of cases are provoked by chlorosis. This is a disease in which the plant disrupts the formation of chlorophyll and reduces the activity of photosynthesis. The main characteristic signs of this disease in hibiscus are yellowing and/or leaf drop. Chlorosis is of two types - non-infectious and infectious.

Non-infectious rose chlorosis

Bacterial spotting

Another variant of spotting caused by bacteria is bacterial burn. Its causative agent is other bacteria belonging to the genus Pseudomonas. Most often, a bacterial burn begins with young shoots, leaves and flowers. Its symptoms are as follows. It is not spots that form on the plant, but immediately rather extensive shapeless blackening areas (as in the photo), which soon dry out. Outwardly, such areas on the sheet look as if it was burnt in this place. The progression of a bacterial burn causes first the death of individual parts of the plant, and then its death. Under favorable conditions, this disease develops very quickly.

When affected by brown rot, the hibiscus stems turn brown and thin at the very base. The rose is greatly weakened and may die. Most often, this disease affects young seedlings and plants.

Chinese Rose Fertilizers

Zircon for rose processing

We cut off all the affected (dried) fragments of the plant, while slightly capturing its healthy parts.
We process the whole rose with special antifungal compounds: Fundazol, Topsin, Dezavid, Alirin-R or others. You can also use the drug Rovral, the solution of which must be poured under the root. There is also a folk remedy - spraying the plant with a solution Trichopolum(for 1 liter of water 2 tablets).
Additionally, you can stimulate the protective mechanisms of the rose by treating it with drugs. Appin, Zircon, House flower. You just need to make sure before that that the selected composition can be used in combination with the antifungal agent used.

If at the initial stage it was not possible to cure vascular wilt, and the hibiscus continues to hurt and wither, it will have to be destroyed. Bacterial spot is remarkably cured by spraying the plant itself while watering the soil in the pot with a solution. Trichopolum(for 2 liters of water 1 tablet). Also effective are such well-known copper-containing preparations as copper sulfate and Bordeaux mixture. Not only for treatment, but also for prevention can still be used Fundazol, Euparen. To prevent damage by brown rot, hibiscus cuttings and seedlings must be treated with a means Rovral. In addition, seedlings should be planted shallow, and after planting, carefully sprayed with the same preparation.

Signs of Stress in Hibiscus

Stress can also be caused by minor changes in the conditions of detention, when their main parameters are within acceptable values (associated with: transfer from one room to another or from a greenhouse to a permanent habitat; with slight deviations from the previous care), seasonal changes in the environment environment (for example, a decrease in the level and duration of lighting in winter), any damage, transplantation or flowering (also stressful for young and weakened plants). In this case, no drastic measures will have to be taken.

The most common pests and their control

Pests start on a plant in two cases: when they are transplanted into infected soil or as a result of contact with already diseased flowers. Hibiscus is most often affected by the following pests.

Aphid. This small insect settles primarily on young leaves and shoots, as well as on plant buds. It multiplies very quickly, creating entire colonies. It is able to completely destroy unopened flowers and young leaves, which at the initial stage of the lesion become sticky and deformed. It is necessary to fight aphids by treating the plant with drugs Akarin, Fitoverm, Biotlin, Intra-Vir, Decis. Also good help Nicotine sulfate and tobacco dust. In the early stages and in cases of a single partial defeat of the leaves, it is sufficient to confine oneself to processing with an ordinary soapy solution.

Whiteflies. They usually hide on the underside of the leaves, where you can find their adults and pale yellow larvae (shown in the photo). A characteristic sign of damage to a plant by a whitefly is the appearance of a shiny sticky coating on the upper side of the leaves. These are pest excrements. After some time, sooty fungi develop in them, due to which the surface of the leaves becomes first white and then black. It is these fungi that can cause severe damage to the plant, and not the whiteflies themselves. In addition, this pest is a carrier of various viral infections. The symptoms of whitefly-borne diseases can be very different. This is chlorosis, and the leaves may turn yellow, deform, curl.

It is necessary to fight this pest by treating the plant with a solution of potassium soap or Aktara, Admiral, Biotlin, Bankol, Spark, Appleud, Fufanon, Tanrek preparations.

Worms. Signs of plant damage by them: waxy lumps and powdery white coating appear in the axils of the leaves and on the cuttings, as in the photograph. Methods of struggle: treatment with the same preparations as for the whitefly.

Leaf bronze virus. The leaves are covered with yellow spots and small tears, in some places coarse and wrinkled.
Control and prevention measures: Diseased plants are removed, and blue sticky traps for thrips, which spread the virus, are hung in the greenhouse.

Ring spot virus. Yellow, often ring-shaped spots appear on the leaves.
Control and prevention measures: Do not use diseased plants for cuttings. In case of severe damage, the plants are destroyed.

Greenhouse and tobacco whiteflies. On the lower surface of the leaves, adult white-winged insects 2-3 mm long and their wingless pale yellow larvae are visible. In the tobacco whitefly, the wings are folded in a "house", while in the greenhouse whitefly, they are more flat. With a strong Defeat, the leaves turn yellow. They have sticky discharge.
Control and prevention measures: They are treated with preparations based on potassium soap or preparations such as Aktara, Actellik, Iskra, Inta-Vir, Karbofos, Fufanon, Tanrek, Zubr, Biotlin, etc.

Spider mite. Yellowish speckles appear on the leaves, later - extensive discolored and dried areas. Small (0.2-0.5 mm) mites live on the underside of the leaves among the cobwebs. The appearance of ticks is promoted by high temperature and dry air.
Control and prevention measures: With a slight lesion, plants can be treated with soap or mineral oil. In case of strong treatment with Fitoverm, Akarin, Vertimek, Lightning, etc.

Aphids. The leaves curl, turn yellow, with a strong lesion, sticky secretions of aphids are visible on them.
Control and prevention measures: On solitary plants or with a weak infestation, aphids are washed off with water and soapy water; in case of severe damage, they are treated with Antitlin, Tobacco dust, Actellik, Fitoverm, Akarin, Aktara, Decis, Tanrek, Spark, Bison, Biotlin, Commander, etc.

Brown rot. It mainly affects seedlings and cuttings at the age of several days or weeks. The base of the stem turns brown and thins. Under fallen leaves, long threads of mycelium develop.
Control and prevention measures: Spray cuttings immediately after planting with Rovral. Seedlings should not be planted too deep. After planting, spray with low pressure to keep the base of the stem well moistened.

Worms. White waxy secretions appear on leaf veins and petioles, in which colonies of mealybugs live.
Control and prevention measures: Affected plants are removed. When spraying foliage with mineral oil (M-30, M-50), the insects suffocate under the oil film. Such treatment is carried out with protection from the sun and not too often.

Bacterial spotting. On the leaves, most often along the edges, yellow rotting spots appear with an oily border.
Control and prevention measures: Plants are regularly examined and, at the first signs of the disease, are treated with Cumulus, Euparen, Rovral, Fundazol and others.

Shields and false shields. Whitish or golden-brown tubercles are visible on the surface of the stems. Usually insects can be picked out with a needle.
Control and prevention measures: You can remove pests from single plants and with a small lesion with an old toothbrush, and then wipe the stems with a cotton swab dipped in kerosene. Insects suffocate under a kerosene film. You can also try leaf gloss sprays (oil-based). If there are many plants or they are severely affected, they are treated with an insecticide, such as mineral oil.