If hibiscus gets sick: Chinese rose diseases, treatment methods. Why Chinese rose leaves curl Indoor Chinese rose disease

Leaf deformation can be caused by several disorders at once. The most common include the presence, but it also plays an important role proper care behind a houseplant.

Before starting treatment, it is necessary to find out exactly what caused the curling of the leaves, because each of the existing causes requires an individual approach.

Below you will see what a plant with curled leaves looks like:

Pests

Chinese rose is quite resistant to a variety of pests, but the plant will not always be able to resist the defeat of spider mites or aphids. You need to look very carefully bottom part sheets.

• Aphids and mites live in small colonies, so it is impossible not to notice them.
• The spider mite lives up to its name because it entwines damaged areas with a slightly noticeable web. If the curling of hibiscus leaves is caused by these pests, then it is necessary to spray the flower with a soap solution. This procedure should be repeated several times.
• If the leaves quickly curl and fall off, this indicates the presence of scale insects. Scale insects are cleaned with a regular brush or rag soaked in an alcohol solution. The alcohol solution can be replaced with soap.

Read about common diseases of hibiscus leaves.

Infectious chlorosis

Often The amount of chlorophyll in Chinese rose leaves decreases, so they begin to curl. A disease such as infectious chlorosis is mainly transmitted by pests. The most common carriers are ticks, aphids and thrips. First of all, you need to get rid of unwanted pests, then water the plant with a solution of iron chelate and iron sulfate.

Priming

Hibiscus needs soil that is well permeable to air and moisture. For successful cultivation Such a plant is not entirely suitable for purchased peat-based soils. In this case, the leaves may begin to curl and the plant may die as a result. It is necessary to add leaf humus, which makes the soil moisture-absorbing. Adding sand or sand also has a great effect on the soil. turf land.

Fertilizers

In order to Chinese rose To grow and bloom normally, it needs a lot of copper, iron, magnesium and potassium. If the plant's leaves begin to curl, this may indicate a lack of microelements. It is necessary to fertilize the soil with special substances as soon as possible.

Fertilizer for the growth of hibiscus, which is sold in any flower shop, is quite suitable. To ensure that the problem no longer makes itself felt, you need to feed the plant once a month.

Watering

If the flower is constantly located in a room with sufficiently dry air, this will certainly provoke rapid curling of the leaves. It is not recommended to allow low level moisture in the room. You can place a tray with wet sand near the potter.

As soon as the sun's rays hit it, the moisture will begin to evaporate, which will have a positive effect on the growth of hibiscus. It is worth noting that to increase air humidity, you need to use exclusively filtered water. It is also recommended to spray the leaves of this plant once every few weeks, but only very carefully.

Lighting

The main enemies of the Chinese rose are direct sunlight. The plant loves light very much, but from such rays it can get burns on the leaves, especially if the flower stood in the shade most of the time and then came into the sun.

Many gardeners recommend Special attention focus specifically on lighting, because not only the problem of leaf curling depends on it, but also general state plants. It is necessary to place the hibiscus in a place where there is a lot of light, but not too hot. In this case, you should water the plant as often as possible and ventilate the room.

Temperature

Inadequate maintenance of hibiscus cold room causes leaves to curl. Optimal temperatures should not be below 18-21 ºC. Hypothermia causes a draft, so you need to choose the right place where the plant will stand.

Chinese rose leaf curl is of course a serious problem, but it can be dealt with quite easily if you know the real reason its occurrence. By taking the right treatment measures, you can return the plant to its former beauty and health without any problems. The hibiscus will then please its owner for a very long time. lush crown and beautiful flowers.

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Hibiscus - beautiful and spectacular home plant, having bright and large flowers. Without a doubt, many gardeners grow hibiscus in their home. However, caring for hibiscus should also be appropriate.

With proper care, hibiscus do not suffer from pests and diseases. But mistakes also happen to an experienced grower. We cannot exclude the influence external factors: for example, purchasing an already diseased plant in a store.

Why indoor hibiscus does not bloom and what to do in this case

One common problem with hibiscus is failure to bloom.
This may be related:

• with insufficient lighting - to set buds, the plant must be in direct sunlight for at least 4 hours a day,
• lack of timely pruning - buds appear only on new shoots,
• pest damage,
• lack of nutrition,
• lack of rest period in winter. From October to February, watering and fertilizing are reduced, and the temperature is lowered to 15-18 degrees. It is believed that under these conditions flower buds are formed. But the plant can bloom in winter, with sufficient lighting.

In order for the hibiscus to bloom, it should be provided with a sunny location, timely pinching and pruning of shoots, rest in winter and abundant feeding in summer. It is necessary to monitor the condition of the plant in order to notice pest damage in time.

Hibiscus pests

Spider mite

One of main enemies indoor hibiscus— . Collectors of varietal hibiscus constantly fight with it, coming up with more and more new ways to fight it. There are many drugs to kill this pest, but the problem is that with regular treatment, the mites get used to them very quickly.

The most popular insecticides are Fitoverm or Kleschevit, which are quite safe for humans. Flower growers often use Actellik, but its vapors are poisonous, so this product is not recommended for use indoors. The preparations Sunmite and Neoron are distinguished by the fact that they destroy not only the ticks themselves, but also their eggs, but these products are not sold in regular stores. flower shops and often do not show much effectiveness.

Oddly enough, it is “ traditional methods» . For example, spraying plants with water, adding a few drops of any essential oil(5 drops per 1 liter of water). You need to do this regularly, every week. The method is safe for humans and destructive for ticks. But if you skip this treatment once or twice, the pests will return.

By the way, if you add growth stimulants (for example) or leaf fertilizers with each spraying, the result will be even better. Of course, medications need to be alternated. Regularly bathing plants in a hot shower works in much the same way. Some hibiscus collectors spray the plants several times every day. warm water and wipe the window sills with soapy water.

From the outside, these methods seem too energy-intensive, but when hibiscus collections are large and expensive, it is better to devote one day a week to spraying or bathing in the shower than to lose plants due to a pest invasion.

Aphid on hibiscus

Such pests are attracted to soft, succulent shoots; its appearance on the plant immediately becomes noticeable due to sticky secretions and deformation of the foliage. Remove insects mechanically using a cotton swab and soap. Then the hibiscus should be treated with special chemicals: , Biotlin, Iskra or any others. You can use traditional methods, but they may not be effective enough. The treatment is repeated several times, according to the instructions. Usually the plant is sprayed again after 2 weeks.

Gall midge: why hibiscus buds fall off

The fact that the hibiscus is dropping its buds may indicate a gall midge infestation. These pests lay their eggs in the buds, therefore, as a preventive measure, all yellowed buds must be removed before they fall to the ground. The soil in a pot with hibiscus is treated with a preparation against soil pests.

The problem with buds may also be due to lack of lighting, uneven watering, lack of nutrition, drafts and moving the hibiscus pot around the apartment.

Diseases of indoor hibiscus

Chlorosis or why hibiscus leaves turn yellow and fall off

One of the problems with hibiscus is leaf chlorosis, that is, loss of color. The leaf blade becomes pale green, almost yellow. The leaves may also begin to fall. This is a sign of iron deficiency. The easiest way to restore the crown's rich color is to spray the plant with iron chelate. You should also change the fertilizer if it does not contain enough microelements needed by hibiscus. Chlorosis in hibiscus: photo Select good feeding It’s really not easy for these plants, so you often have to go through various options.

Lack of nutrients (potassium, magnesium, zinc, sulfur)

The appearance of yellow spots, for example, after transplantation into new soil, may be caused by its lime content or lack of nutrients. Then you should replace the soil or use special drugs to compensate for the lack of certain substances.

• With a lack of zinc, the leaves become smaller and speckles appear on them.
• Lack of sulfur is expressed in browning of the leaf edges.
• When there is little magnesium, chlorosis occurs between the veins - the so-called “marbling” of the leaf, sometimes with the appearance dark spots.
• A lack of potassium is expressed in the death of the leaf edge, which looks like a burn.

If the above methods do not work, the chlorosis may be caused by viruses. Infections are carried by various pests; if such symptoms occur, you need to get rid of the insects and treat the hibiscus with fungicides.

Sunburn

Hibiscus plants generally tolerate direct sunlight well. But if the plant has been standing in the shade for a long time, and it is placed in the sun without an adaptation period, sunburn may occur. They look like yellowish or red dry spots. Burnt leaves will have to be removed, and the flower will need to be gradually acclimated to the sun. It happens that foliage is pressed against the glass - then a burn may also occur on it.

Also sunburn - main reason Why do hibiscus leaves curl?
Sunburn on hibiscus: photo The key to healthy hibiscus is proper care. Strong immunity allows the plant to cope even with pests and provides an attractive appearance And abundant flowering.

See also a useful video about caring for hibiscus in winter and summer:

Hibiscus diseases occur when the plant is not properly cared for. improper cultivation or infection with pathogenic viruses, fungi, pests. The article describes in detail the problems of cultivating hibiscus, its diseases and methods of treating them.

Main diseases of hibiscus

The plant is quite unpretentious, so even serious mistakes, if they occur in single quantities, cannot cause significant harm to it. But systematic violation conditions of agricultural technology will definitely provoke troubles, the plant will begin to wither, feel unwell, and get sick. All known hibiscus diseases can occur due to the following phenomena:

• Staying in a hot, dry room.
• Lack of spraying, especially in the summer.
• Being exposed to wind, drafts, or direct sunlight.
• Dusty, dirty hibiscus.
• Excessive watering, which caused root rot.
• Watering a Chinese rose bad water(not settled, containing a lot of harmful impurities).
• Infection by pests as a result of contact with diseased plants.
• No replanting or fertilizing.
• “Overfeeding” hibiscus with nutritious fertilizers.
• Poor lighting, or turning the flower over with the other side facing the sun.

If the living conditions of the Chinese rose are favorable, then it grows for a very long time, and blooms from March to October and even longer. But the violations described above, subject to their regular influence, can provoke various diseases. Below are the most common ones.

Leaf diseases

Separately, I would like to dwell on the problems and symptoms that arise when the vital functions and development of a flower are disrupted. Leaf diseases in most cases are caused by chlorosis - a decrease in the production of chlorophyll in the green part of the plant. Below are the main symptoms of trouble in the state of hibiscus, as well as their possible causes:

1. Yellowing of leaves – pest infestation, plant root diseases, leaf chlorosis, poor indoor air humidification.
2. Falling leaves of hibiscus - low humidity, lack of spraying, sudden changes in lighting, drafts, and other types of stress for the flower.
3. Yellowing coupled with falling leaves means waterlogging of the root system in winter, stress, low humidity in the room.
4. Curling of leaves into tubes means damage from aphids or some other pests.
5. Wilting of the tips of the leaves - lack of nitrogen, phosphorus, other nutrients, complete lack of complementary feeding of hibiscus.
6. General wilting of the leaves and the entire flower - the temperature in the room exceeds the norm, the humidity decreases to low levels.
7. Dropping of leaves and buds by the plant - absence required quantity potassium in the soil, damage to leaves by gall midges, high temperature in the room.

Treatment of diseases

Most plant problems can be solved by normalizing its contents. To do this, it is important to ensure the following conditions:

• Do not water the flower too often, but do not forget to do it regularly, without drying out the earthen clod
• Remove the flower from direct sunlight, place it in partial shade
• Feed hibiscus with fertilizers once a week until about mid-August, then once a month
• The amount of watering in autumn and winter should be reduced, and the plant itself should be placed at a temperature of up to 15 degrees
• Spraying the flower should be daily, regardless of the time of year.
• Provide good drainage, replant a Chinese rose

Treatment of hibiscus diseases is carried out depending on the existing problems. So that there is no sunburn, those plants that are grown in greenhouses should be placed in the sun for an hour and a half a day, and only then begin to leave them for a longer period. Leaves that have already become covered with burn spots will fall off and new ones will grow to replace them.

Regular feeding of the plant with fertilizers, which can be found in any gardening store, helps greatly against non-infectious chlorosis. Before watering, water in case of iron deficiency should be flavored with iron chelate. Timely replanting, avoiding contact with diseased plants, cleaning from dirt and dust, and applying fertilizers will help prevent infectious chlorosis. Periodically, the flower should be washed in the shower, covering the ground with cellophane. Temporary quarantine is required for all new plants.

It is very difficult to treat vascular wilt of hibiscus; it is not always possible to cure it. Many plants die quickly, sometimes their leaves do not even have time to fall. You can try to get rid of the problem in the following ways:

• Cut off all dried areas, slightly capturing healthy parts of the flower
• Treat the entire plant with special antifungal drugs (Dezavid, Grom-2, Domotsvet, Tsitovit, Alirin-B, etc.)
• Sprinkle the Chinese rose with Trichopolum solution (2 tablets per liter of water) - folk method

Pests

Plant pests settle on it after contact with diseased flowers, or when transplanted into contaminated soil. The most common pests found on Chinese roses are:

1. Aphid. small insect, settling on buds and young shoots. It multiplies quickly, creates colonies, destroying young leaves and unopened flowers, which initially become sticky.
2. Spider mite(red spider). Invisible without a magnifying glass, it lives at the bottom of the leaf, enveloping it with a shell similar to a cobweb. It reproduces best in warm, dry air.
3. Greenhouse whitefly. Causes yellowing of leaves and covering them with sticky secretions. The insects themselves or their yellow larvae can be seen from the bottom of the leaf.
4. Scaleworms. They manifest themselves as waxy white secretions on cuttings and in the axils of leaves.
5. Scale insects, false scale insects. After their colonization, brown tubercles are observed on the stems.
6. Gall midge. This midge causes falling, yellowing of leaves and buds that do not have time to bloom. Inside the buds you can find small midge eggs, from which worms emerge. They eat the buds from the inside, which fall to the ground along with them.

What to process

The question of how to treat hibiscus against diseases in the presence of pests is very relevant. If prevention of diseases caused by pests turns out to be ineffective, then the following treatment methods are carried out:

• For aphids - treatment of the flower with Anabasine, Nicotine sulfate. It is recommended to change the drug more often - to Decis, Fitoverm, Intra-vir, Tobacco dust. For single leaf infestations by aphids, treatment with a soap solution helps.
• For scale insects - spraying with a solution of Actellik or other insecticides.
• For scale insects - leaf treatment mineral oil, which is done only when the plant is in the shade.
• For whiteflies - treatment with Aktara, Karbofos, Iskra, Tanrek, Biotlin, Bison, application of potassium soap.
• For spider mites - wash the plant with soapy water, treat with Molniya, Vertimek, Akarin, Fitoverm.
• For gall midges - collecting affected buds, preventing them from falling to the ground. The soil itself must be treated with any medicine against soil pests.

Among the folk remedies that can be used to combat plant pests, the following are popular:

• Pour dry red pepper with water (1:2), cook for an hour, strain. 10 gr. dilute the resulting solution in a liter soapy water, treat the plant. This method works well against ticks and aphids
• Boil dry mustard (50 g) in a liter of water for 15 minutes, let cool. Dilute the product in 20 liters of water, rinse the leaves of the flower from aphids and scale insects

If you comply with all the conditions for growing a plant, then it is unlikely to have problems in the form of diseases and pest infestation. A healthy hibiscus will bloom for a long time and delight its owner.

But, despite this, agricultural technology when growing “Chinese rose” is very important and failure to comply with it 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 can be non-infectious and infectious.

• Non-infectious chlorosis appears when there are disturbances in the plant’s nutrition: lack or excess of nitrogen, magnesium, potassium, iron. Potassium and magnesium are competing elements in nature. An excess of one leads to a deficiency of the second. Potassium is essential flowering plant. If it is deficient, the plant does not bloom, or the flowers are poorly colored and the branches are thin. A lack of magnesium leads to chlorosis. Iron deficiency also causes leaves to turn yellow and fall off. In order to prevent this, water for watering the plant must be settled and iron chelate added to it.
• Infectious chlorosis caused by viruses, fungal microorganisms and pests. Cleaning from dust, timely application of fertilizers, replanting and pest control will help avoid these diseases.

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

Diseases caused by pests

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

Spider mite (web on hibiscus). The leaves of the affected plant become dull and become covered with yellowish specks. Subsequently, large dry areas appear on them. The underside of the leaves is covered with cobwebs 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 them with Molniya, Fitoverm, Akarin, etc.

Aphid. Aphids are attracted to young leaves and buds of the plant. When damaged, they become deformed and become sticky. To prevent and combat the disease, the plant is treated with soap solution, tobacco dust, Biotlin, Akarin, Decis, etc.

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

Scale insects and false scale insects. Brownish or pale brown tubercles appear on the stems of the plant. If the plant is slightly damaged, the pests are removed mechanically, and the affected areas of the plant are wiped with kerosene or mineral oil. In case of severe damage, it is better to treat the plant with an insecticide.

Bacterial spotting. The edges of the leaves of the affected plant are covered with rotting yellow spots. To prevent and treat the disease, the plant is systematically inspected and treated with Fundazol, Cumulus, Euparen, etc.

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

Vascular withering. Caused by fungi. The affected plant's branches and trunk quickly dry out, sometimes without having time to lose foliage. To treat the disease, the damaged parts of the affected plant 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. Midge midges lay eggs in tiny hibiscus buds, so To prevent the disease, yellowed buds are collected, not allowing them to fall, and the soil under the flower is treated with a preparation against soil pests.

Symptoms of diseases

Hibiscus leaves are turning yellow. Most probable reasons diseases - damage by pests (aphids, spider mite), diseases of the root system, insufficient air humidity or chlorosis of leaves. The causes of chlorosis are an excess of chlorine and calcium in irrigation water with a lack of nitrogen and iron. Water for watering the plant should be settled and iron chelate added.

Hibiscus leaves are falling. Stress, insufficient humidity. It is necessary to create rest for the plant and spray it.

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

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

The tips of the hibiscus leaves are wilting. Lack of nutrients. It is necessary to feed the plant with nitrogen and phosphorus preparations.

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

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

What to do if he dies?

If your Chinese rose is sick, do not despair, it may be possible to revive it. Hibiscus is unpretentious and can be treated at home.

On this moment Many drugs have been developed for pest control; they can be purchased in specialized stores or used traditional methods, treating the plant with a solution of soap, tincture of tobacco or pepper.

Folk remedies for hibiscus pest control

Pepper tincture (against aphids, mites) – Dry pepper is poured with water in a ratio of 1:2 and boiled for an hour, then infused and filtered. To spray a plant, 10 g of the drug is diluted in one liter of water and soap. Soap should be about 5g per liter.

Tobacco tincture (against aphids, thrips, mites) – 1 kg tobacco dust or tobacco is boiled in 10 liters of water for two hours. Leave 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 drug, 200 g of potassium soap is diluted in 10 liters of water.
Mustard tincture (for ticks, aphids) – Boil 50g of mustard in a liter of water and infuse. Before use, the concentrate is diluted in 20 liters of water.

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

Photo

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1) The buds do not open and fall off.

The reason is that the plant is experiencing stress (sharp violation of maintenance conditions): drought or, conversely, lack of moisture, the temperature is too low or too high.

2) Simultaneous yellowing of leaves (up to 40%).

Possible reasons:

• change of conditions of detention, insufficient watering(especially in the heat);

• excessive watering (too short intervals between waterings, the situation is aggravated when low temperatures contents) or, for example, the plant was dried out (forgot to water), and then we fill it with water, mistakenly assuming in this way to improve the situation;

• overheating of the earthen coma with simultaneous moisture deficiency in the soil;

• too low (high) ambient temperature;

• too much direct sunlight V daytime during the period May/August; the situation is getting worse high temperature and low humidity;

• drought.

3) During the growing season, there is no vegetative growth, and the leaves may turn yellow and there is no flowering.

Causes :

• poor lighting of the plant;

• the plant is infected with pests (aphids, spider mites);

• the plant is exposed to a draft (wind).

4) The sheet becomes deformed, curls, and the structure becomes rigid.

The reason is the plant’s phytotoxic reaction to chemical treatment. drugs.

5) The leaf turns brown along the edge of the leaf blade.

Cause - too frequent feeding and (or) the concentration of fertilizer was too high, and (or) fertilizing was carried out on a dry substrate.

Water the earthen ball big amount water (to wash out excess fertilizer).

6) The edges of the flower's petals are curled (the defect occurs in plants kept outdoors).

The reason is excessive watering in the heat and/or exposure to sunlight in the morning on a dew-covered petal.

7) The plant is infected with diseases of viral, bacterial or fungal origin.

7.1 Symptoms: rusty spots appear on hibiscus leaves.

• The cause is a fungal disease of Alternaria origin. Plants suffering from nutritional deficiencies are usually affected. The disease worsens during periods of high humidity air. Swipe foliar feeding plants, treat it with Zineb or Benlate fungicides.

7.2 Symptoms - Hibiscus leaves become covered with black spots and marks (especially in cool weather).

• Reason - fungal disease, which primarily affects weakened plants. Treat the plant with Benlate or Zineb fungicide and inspect its conditions.

7.3 Symptoms - hibiscus leaves and flowers curl, the flowers have a faded color.

• The cause is a viral disease. The plant is disposed of.

7.4 Symptoms - the stems of the plant turn black, depressions form at the site of the lesion. Symptoms appear in autumn/winter.

• The cause is a fungal disease. No treatment is carried out - the plant is disposed of.