Why do the roses in the flowerbed wither? The leaves of a rose turn yellow - treatment and care Why do the leaves of a garden rose turn yellow

Almost all rose lovers who grow them observe yellowing of the leaves of the crop. Moreover, this phenomenon can be observed regardless of the quality of plant care. So why do rose leaves turn yellow? In addition to natural age-related changes in the body of a flower, there are also unnatural groups of causes of yellowing of leaves. What factors cause this phenomenon and how to deal with it?

Watching a rose's leaves turn yellow and fall off is very painful. It is much more pleasant to observe healthy individuals. What are the causes of yellowing leaves? Are straw organs always evidence of illness? In fact, there are many reasons for leaves turning yellow.

Sometimes a leaf turns yellow due to the physiological characteristics of an individual of a certain species and variety. In this case, you should not take any action, especially since it is unlikely that you will be able to change anything. The situation is completely different if the organs of a young bush change color. In this case, inaction can even provoke the death of the plant.

The causes of yellowing of the organs of young individuals can be grouped according to the nature of the manifestation:

Rapid yellowing and falling off. This phenomenon is usually observed in the case of unfavorable external conditions. In particular, sudden temperature fluctuations. Similar phenomena can be observed in the summer in case of frequent weather changes. However, most modern varieties are adapted to unstable environmental conditions.
The leaves of the roses at the bottom of the bush turn yellow, most likely due to a lack of light. Perhaps the individual grows in the shade and suffers from this.

Therefore, you need to be especially careful when choosing a site for planting roses. This should be a place protected from the wind, well lit by the sun. For example, the south or southeast side of the site is perfect.

In the shade, not only a change in the color of plant organs is observed, but also the elongation of shoots and a slowdown or cessation of flowering.

Are the leaves turning yellow and curling, and the tips of the organs turning brown and drying out? Rose is trying to tell you that she doesn't have enough water. In addition, under conditions of moisture deficiency, plants become deformed and flowers fall off. The flowering process stops. In hot conditions, representatives of climbing varieties growing near the wall of the building especially feel the lack of water.

Young, recently planted individuals also need systematic moisture.

Yellow spots appeared on the organs. Usually this phenomenon is caused by a lack of nutrients in the rose body.

Video “Causes of yellowing rose leaves”

In this video you will see why rose leaves turn yellow.

Battery deficiency

Why do the leaves turn yellow? Very often the cause of the phenomenon lies in an imbalance in the supply of fertilizers to plants. Some rose lovers do not pay any attention to the change in the color of the organs and continue to care for the individuals as usual.

Nitrogen. Often the cause of leaf color change is nitrogen starvation of the crop. For example, a bush planted on poor soil or insufficiently fertilized throughout its life often suffers from a deficiency of the element. If enough nitrogen was added in the spring, the rose bloomed and gained strength, but in this case the plant used all the nitrogen. Without re-fertilizing at the end of summer, you may experience “October” yellowing and leaf drop.

It is not difficult to determine the lack of nitrogen, since the color change occurs gradually, starting with the organs located below. You may not immediately notice the change in color of several leaves. However, after some time the bush will turn almost half yellow, after which the plant turns pale.

Another “spring” sign of nitrogen deficiency is yellowing of shoots. Instead of being dark in color, the organs become pale red or slightly brown. The leaves growing on such stems have the same color.

It is easy to determine the lack of nitrogen in the crop body, as well as to completely eliminate it. You just need to dilute urea (a tablespoon per 10 liters of water) and pour half a bucket onto the bush. Watering by leaves is allowed. The first positive results will become noticeable after a couple of days, and after 10 days the individual will completely acquire its usual healthy appearance.

Potassium. When it is deficient, the edge of the leaf first becomes straw-colored, after which the organ changes color to brown and dries out. In this case, ash and potash fertilizers will come to the rescue.
Iron and manganese. If there is a deficiency of at least one of the elements, the leaves develop chlorosis, and the space between the veins changes color. The vein does not change color, remaining green.

With a deficiency of iron, first of all, the upper young organs turn yellow, and with a lack of manganese, the old leaves turn yellow.

Often, a lack of these elements is observed on soils with a reaction above 7-7.5, that is, on alkaline soils, which usually contain chalk and dolomite. Individuals may also lack iron and manganese in soils that were oversaturated with lime during the deacidification procedure.

What should I do to correct the situation? You can get rid of chlorosis by spraying flowers with a solution of fertilizing with iron and manganese. It is also necessary to normalize the soil reaction (indicator 5.6 - 7). You can acidify the soil with organic matter, for example, mullein. The procedure involves creating a small hole on one side of the plant where there is access to the root. It is necessary to pour 2.5 liters of mullein solution into such a recess. Thus, part of the root system will have access to the soil, which will bring the number of elements back to normal.

Waterlogging of the soil

Leaves may also turn yellow due to waterlogging of the rose root system. This often happens due to the plants being in damp soil for a long time. The phenomenon is usually observed in low clayey areas during rainy periods. Dew plays a significant role in this phenomenon. Signs of overhydration resemble nitrogen deficiency. The color change starts from the lower organs, but nitrogen supplements in no way improve the situation.

If the area is located in a lowland, then it is better to plant flowers on mounds or elevated areas.

Diseases and pests

Yellowing leaves may be a reaction to disease. If the disease is caused by a fungus, the bush can be easily saved. If the causative agent is a virus, then the infected individual must be eliminated from the site and destroyed.

Roses are most often attacked by black spot. Sometimes it is not even considered a disease, believing that the spots are a natural development of the plant. However, this is still a fungal disease that is dangerous for almost all varieties of roses.

A fallen leaf from a bush is evidence that the plant will not survive the winter well and will slow down its growth and flowering.

Yellow leaves with black spots are a manifestation of spotting. You can help the crop with complex fungicides, for example, Topaz, but it is more effective to use such sprays for prevention (mid-to-late June).

In addition, there are viral diseases, as a result of which the leaves become covered with small or large spots of various colors. Usually the leaves become smaller, change shape, and the plant itself slows down and stops blooming. There are no methods for treating viral plant diseases, so infected bushes are simply removed from the site and destroyed.

If the leaves not only turn yellow, but also begin to fade, then there is a high probability that the larvae of the May beetle or other rootworms have settled on the roots of the flowers. Pests can be controlled with a variety of insecticides.

So, rose growers often observe yellowing of the leaves of their plants. Some cannot determine the cause of the phenomenon, while others do not know what to do to change the situation. Leaves from roses can turn yellow and fall for various reasons. But they are easy to identify and subsequently eliminate. The main thing is to carefully monitor the flowers and not take yellowing for granted, the natural development of individuals.

Video “Roses diseases and their pests”

From the video you will learn about the most common diseases of roses and how to combat them.

Let's talk today about why the leaves of indoor roses turn yellow. What to do? - this question worries many flower growers. There are not so many reasons for this; each has characteristic features. Therefore, it will be easy to determine exactly what your indoor rose does not like.

Microelements

Very often leaves turn yellow due to lack of mineral fertilizers. And in different ways:

Nitrogen. The leaves turn yellow entirely, starting from the lower ones. Then they fly around. The rate of yellowing gradually increases, leaf fall accelerates. The shoots become pale green or red.
Iron. Yellow spots of chlorosis appear between the veins on the leaf blade. At the same time, the veins themselves remain the color characteristic of the variety. The process begins on young shoots and spreads from top to bottom.
Potassium. A clearly visible yellow border appears on the leaves, which soon dries out. Signs are visible throughout the plant.
Manganese. Yellowish spots appear on the lower leaves. The veins remain their usual color. The process goes from bottom to top along the stems.

You should not immediately shove a complete complex mineral fertilizer into the water for irrigation. An excess of some trace elements also leads to yellowing and leaf fall. First, determine exactly what your beauty is missing, and only then feed it with a certain type.

But not in huge doses! The plant is already weakened, and you are also burning the roots with an overdose. Make a half-strength fertilizer solution first. And after 14 days you can already take the full dose.

In the future, do not forget about regular nutrition for your indoor rose. After all, it requires a lot of strength and energy to set buds and bloom for a long time. After this, the flower sometimes turns out to be so depleted that it may die before it has time to turn yellow. Even regular replanting into new soil is not able to cover the microelements requirements of an indoor rose.

Advice. To avoid such problems (in case you forget), use fertilizers in the form of sticks or tablets. These are the so-called long-lasting forms. They dissolve gradually, with each watering, and give the indoor rose exactly as much nutrition as required. And in full.

Excessive humidity

This cause of yellowing leaves of indoor roses is often confused with a lack of nitrogen. In the same way, leaf blades change pigmentation completely, starting with the oldest and lower ones. The process gradually accelerates, the leaves fly off, and then the flower dies.

These signs can only be distinguished after feeding the plant with urea. If it didn’t help, then it means you just flooded your beauty. Carefully inspect the drainage holes. Perhaps they are clogged with soil or an overgrown root system.

Do not allow this to happen, otherwise the indoor rose will not just turn yellow, but will begin to rot. And it’s good if the damage is noticed in time. Then it will be easy to cure. What if it's too late? It would be a pity to destroy such beauty.

In general, this plant loves moisture. Drying out the earthen coma is completely unacceptable! So how to find the golden mean? The answer is very simple. Just two conditions and your flower will not turn yellow. This is high-quality drainage and watering as the top layer of soil dries. In this case, the water should be melted, settled and at room temperature. Just don’t drag the liquid from the street, after rain or snowfall. Clean precipitation now only exists in the past. Also poison the plant with the entire periodic table. The tap water will be cleaner.

Advice. Spray your indoor rose daily with warm water from a spray bottle. High air humidity will prevent yellowing and drying of the tips of the leaves.

Diseases

The most common disease of all roses is very often confused with the natural aging of foliage. This is not surprising, because the signs are very similar. The lower leaves turn yellow first. Then small spots of a dark, almost black hue appear on them. Over time, they grow, the leaf blades dry out and die.

The only difference from normal senescence is the amount of yellowing leaves. There are many of them throughout the plant. And the natural process involves the loss of one or two.

What to do in such a situation? Traditional methods will not help. This is clear. Removing infected leaf blades does not solve the problem either. But we cannot remain idle. Fungicides work very well against black spot. Prepared strictly according to the instructions and used in the correct dosage, they solve the problem in two, maximum three sprays.

Naturally, fungicides themselves do not kill bacteria. But they very well restrain their development and further spread. Well, further competent care gives the indoor rose enough strength to cope with the weakened sore.

Advice. The leaves of indoor roses can also turn yellow due to infection by a viral disease. In this case, you will have to part with the beauty. Modern science has not yet come up with methods to combat such a scourge.

Pests

Sometimes the leaves of indoor roses slightly change color to a lighter shade, which many confuse with yellowness. At the same time, the old leaf plates begin to wither, and the young ones grow deformed and pale. This indicates the presence of pests in the root system area.

Don't rely on your sleight of hand, it may not be enough. Use any broad-spectrum or long-acting systemic insecticide. Be sure to repeat the soil treatment in a month.

Advice. Be sure to replant your indoor rose from store-bought soil into your own. But only after disinfection by freezing or heating in the oven.

Other reasons

Here we deliberately did not give too prosaic reasons for the yellowing of the leaves of an indoor rose. Any self-respecting florist, before growing a new flower, thoroughly studies the conditions of maintenance and rules of care. Therefore, it is not described here what to do in case of sunburn or banal hypothermia of an indoor rose.

Lack of lighting or too high ambient temperature are also provoking factors for yellowing and leaf fall.

By the way, some varieties of indoor roses are deciduous. That is, they have a clearly defined rest period from October to February. Find out more details from the seller or online. Yellowing and dropping of leaves may be preparation for wintering, and not a disease. What if your plant goes to sleep, and you are racking your brains and stuffing it with fertilizers? It’s better to prepare a cool room for the beauty to fully relax.

Well, we have discussed the most common reasons why the leaves of an indoor rose turn yellow. What to do? - we also found out. We really hope that now your beauty will stop being capricious and will delight you with gorgeous flowers more often.

Video: what to do if the leaves of an indoor rose turn yellow

To solve the problem, the probable causes of this phenomenon are determined, there are several of them:

Unsuccessful transplant;
Improper watering;
Insufficient air humidity;
Lack of light;
Excess or lack of fertilizers;
Drafts;
Sunburn;
Pests;
Diseases.

All these reasons can lead to yellowing and falling leaves of a domestic rose.

Reason 1. Unsuccessful transplant

After purchase, you should not immediately replant an indoor rose - it needs time to adapt. The air in the living room is drier than in the store, and in winter the heating radiators are also turned on.

Reason 2. Improper watering

Yellowing in the middle of the leaf, along the veins of a domestic rose, often occurs due to drying out or waterlogging of the soil. Overdried soil and the appearance of a crust with cracks on the top layer are a clear sign of a lack of moisture.

When the soil becomes waterlogged, watering is temporarily stopped and replaced by spraying. It is necessary to water the plant when the soil dries to a depth of 1-2 cm. Settled water is used for watering.
The frequency of moisturizing depends on the time of year. In summer, roses require regular, abundant watering.
Watering is gradually reduced after the end of flowering, bringing it to 1 time every 7 days during the winter months.
In spring, watering is increased after a sufficient number of leaves have bloomed.

Reason 3. Insufficient air humidity

Miniature house roses need high air humidity.

Reason 4. Rose leaves may turn yellow due to lack of light

For comfortable growth and successful flowering, indoor roses need to be in the sun for 5–6 hours. A west or southwest window is suitable for this. On southern windows, due to excess direct sunlight, rose buds quickly bloom and also quickly wither. North windows are not suitable due to lack of light.

It is worth talking about problems with lighting when the foliage turns yellow on the shaded side.
For uniform formation of the crown, the bush is turned to the light in different directions.
In the spring-summer period, it is advisable to take the pot with a rose out onto the loggia or balcony, where the amount of light is sufficient for the harmonious growth of the flower.
Even better, plant the flower in open ground or dig it into the ground along with the pot. There it will easily tolerate even exposure to direct sunlight.

Reason 5. Excess or lack of fertilizers

Yellowing of the leaves of an indoor rose can be caused by an excess or lack of fertilizer. The appearance of the foliage depends on the following elements.

Iron

Plants that receive sufficient iron levels grow strong and disease-resistant. Iron deficiency causes a disease called chlorosis. The leaves curl at the edges, turn yellow, and become smaller. First of all, young leaves suffer from iron deficiency, then yellowness spreads to adult leaves. Chlorosis is accompanied by slow growth of domestic roses and loss of green mass. Iron deficiency occurs more often in alkaline soils.

What to do: To restore acidity, use a fertilizer that acidifies the soil, for example, organic. If the acidity level is neutral, foliar fertilizing with Ferovit and Ferrilene is used.

Nitrogen

Roses experience nitrogen deficiency more often in the spring. Lack of nitrogen leads to paleness and yellowing of the foliage. The color change starts from the lower leaves and gradually moves upward. Meanwhile, the lower leaves fall off.

What to do: Nitrogen deficiency can be replenished by fertilizing with urea or universal fertilizer.

Manganese

With a lack of manganese, yellowing begins with old leaves. Yellowness appears between the veins, moving from the edge to the center of the leaf. A green border remains around the veins. This happens when an indoor rose is planted in alkaline soil. Either a lot of lime was added when planting the bush.

What to do: The situation will be corrected by adding a solution of manganese sulfate under the plant, deoxidizing the soil.

Magnesium

Magnesium deficiency occurs more often in plants growing in acidic soils. The deficiency of the element is reflected first on adult leaves, and then on young ones, in the form of discolored spots. Reddish-yellow spots appear between the veins. The edges of the leaves remain green, but leaf fall on the windowsill is inevitable.

What to do: the magnesium content is restored by adding magnesium sulfate and ash. If there is an excess of magnesium, potassium cannot be absorbed by plant roots. When applying fertilizers, adhere to the recommended dosage.

Reason 6. Rose leaves may turn yellow and fall off due to drafts

Drafts - the enemies of house plants - provoke yellowing and shedding of leaves.
If drafts are unavoidable, then you can make a paper or plastic screen to the height of the crop. It will protect the flower from drafts.

Reason 7. Sunburn of rose leaves

Sunburn leaves brown and yellow spots on the leaves. Damaged foliage dries out and falls off. Burns appear from excess direct sunlight or from spraying with cold water in the scorching sun.

You can avoid burns by moving the pot to a southwest or southeast window.

Reason 8. Pests of indoor plants

Pests on domestic roses also contribute to the appearance of yellow leaves and worsen the condition of the plant as a whole.

Spider mite

The insect lives on the underside of the leaf, spreading a web along the shoots. The foliage turns yellow, dries, young shoots die. The reason for the appearance of spider mites is excessively dry and hot air in the room, a dense cluster of plants.

Fighting methods:

It is necessary to lower the room temperature
Increase air humidity
Wash the rose bush from cobwebs with a solution of laundry soap
Treat with Fitoverm or Vermitek solution. Treatment is carried out at least 2 times, with an interval of 10 days.
It is advisable to isolate the diseased plant from other plantings.
The soil is also treated with insecticides.
Prevention against mites - frequent spraying of roses.

The adult and larvae of the pest live on the underside of the leaf blade. As a result of the life activity of the rose leafhopper, pale spots appear on the foliage. The leaves turn yellow, curl and fall off, and the development of the rose slows down. The reproduction of the rose leafhopper is promoted by heat and dry air.

Fighting methods:

At the initial stage, wash the plant with soapy water on all sides.
In case of severe damage, the rose is treated with solutions of insecticides, for example Aktara or Fitoverma.
To enhance the effect of the drugs, add a tablespoon of alcohol per liter of solution.

Thrips

When affected by microscopic thrips, the leaves become yellowish and have a silvery coating and are deformed. Infection is favored by elevated temperatures and dry air.

Thrips on rose leaves.

Fighting methods:

It is necessary to ensure high air humidity
Before spraying a plant with an insecticide solution, isolate it from other plants.
The soil and the place where the flower stood are also treated.

Reason 9. Indoor rose diseases

Unfavorable conditions and improper care provoke diseases. Regular inspection of plants will help prevent their occurrence.

Powdery mildew

The cause of a fungal disease such as powdery mildew is too wet soil, lack of fresh air, excess fertilizer or heat.

Signs of the disease include yellowing, curling and falling leaves.

Fighting methods:

Be sure to remove diseased shoots, leaves, buds
Treat the entire bush with a fungicide solution.

Black spot

Black spot is an infectious disease. Signs of the disease: yellowing of the green mass, formation of dark spots with jagged edges. A diseased rose does not tolerate winter well, grows more slowly and blooms little.

Fighting methods:

Any systemic fungicide will help defeat the disease.

Knowing why indoor rose leaves turn yellow and fall off, you can prevent many problems.

A few more necessary rules for caring for mini roses:

Flowers need access to fresh air.
From October to February, indoor roses need rest.
After flowering ends, reduce watering.
Shoots are shortened to 10 centimeters.
Roses are transferred to a cool room.
In spring, rested bushes will begin to actively produce new shoots and form buds.
Roses are pruned twice a year: before wintering, during flowering.
When pruning, the outer bud is left. A bud that is directed inside the bush does not form it correctly.
When shortening shoots in the fall, 4-5 buds are left for each strong shoot, and 2 buds for each weak shoot.
During summer pruning, faded flowers and yellow leaves are removed.

To activate the protective functions of indoor roses, to increase immunity, plants should be periodically treated with biostimulants: Epin, Zircon.

Happy owners of a luxurious plant - roses, must know all the necessary rules for caring for this fastidious flower “queen”. If an indoor rose turns yellow and the leaves fall off, this is a signal of unfavorable development of the plant; it is necessary to urgently take action to eliminate such signs. Ignoring the symptoms of plant diseases leads to disastrous results, in the worst case, even to the death of the flower. It is necessary to immediately identify the causes of yellowing of the leaves and take all measures to eliminate them.

First you need to figure out why the leaves of an indoor rose turn yellow. Often, to solve this problem, it is enough to move the pot to another place where there is no direct exposure to sunlight - then the condition of the flower will normalize. But it happens that the reasons for yellowing of leaves lie in other unfavorable conditions for the development of the plant.

Unfavorable factors for roses

If you water with too cold water, you should water with water at room temperature.
Drafts - it is recommended not to keep the plant under an open window.
Abundant or, on the contrary, rare watering - the rose requires optimal moisture content in the soil.
Lack of fresh air - in summer you need to take the pot out onto the balcony or terrace.
Lack of nutrients - roses definitely require regular feeding.
Incorrect replanting - if you need to move the plant into a large container, this should be done with the utmost care, and the month chosen for such actions is February. In this case, the rose has a better chance of taking root.
Powdery mildew is a white coating that appears when there is excessive application of fertilizers or lack of fresh air.
Rust – appears in the form of tubercles. The reasons for its appearance are abundant watering and high room temperature.
Thrips - appears at low humidity, it gives the leaves a gray-yellow color.
Spider mites are caused by too dry air or insufficient space for plants.

Yellowing of roses due to lack of nutrients in the soil

Many people ask this question: why do rose leaves turn yellow? Often the reason for this is an insufficient amount of nutrients in the soil:

Nitrogen deficiency is characterized by faded and wilted leaves.
When the phosphorus content in the soil is low, not only the above-ground part is affected, but also the rhizome. An excess of this substance is also undesirable.
Potassium is responsible for the duration and intensity of flowering. Its insufficient quantity manifests itself in the appearance of brown, yellow spots on the leaves.
Chlorosis is caused by a lack of iron in the soil. Its first signs are yellowing of the leaf.

Why does an indoor rose turn yellow?

What to do if the plant begins to wither and the leaves turn yellow, although all care recommendations have been followed? If the plant is still young, and the process of natural aging is excluded, perhaps the reason lies in the presence of a disease, which will require special medications to get rid of.

Diseases

Traditional methods also help a lot. To obtain medicine for your pet, you need to infuse 170 g of chopped garlic in 1 liter of water for 5 days. The resulting infusion is diluted with water in a ratio of 1 teaspoon per 1 liter. To achieve better results, you can sprinkle the soil with mustard or wood ash.

An indoor rose requires close attention and careful care. It is imperative to monitor the condition of the leaves and promptly prevent the development of diseases. By following the care recommendations, you can grow a beautiful flower with rose buds that will delight its owners with a luxurious, royal look.

The rose surpasses other flowers in beauty, tenderness, impregnable thorns and wonderful aroma. Persia is considered its homeland. In our climate zone, some varieties of roses can be planted in open ground, while others are suitable only for indoor keeping. She is capricious and demanding, and if not properly cared for she can get sick. at the rose, and how to help the wayward beauty?

Flower garden on the windowsill

In flower shops you can buy charming miniature roses of any color. As a rule, the splendor of bushes is achieved by planting several plants in one pot at once. Unfortunately, roses at home can quickly lose their attractiveness: the shoots wither, the foliage turns yellow, and the buds fall off.

What causes premature wilting and why do rose leaves fall off? Growers plant the plants in small pots filled with a mixture of special soil and fertilizer. Already in the store, the roots begin to suffer from lack of space, the earthen ball quickly dries out, and the supply of nutrients runs out. This can lead to severe oppression of the bushes, and even to their death.

The main reason why rose leaves fall is a sudden change in lighting and temperature conditions. The plant is under stress and needs to get used to the new conditions. Roses love direct sunlight, coolness and fresh air. If they get this, they will be able to grow and develop in their new home.

Another reason is drying out of the soil. The flower must be watered well. As soon as the store rose has faded, it needs to be transplanted into a larger pot in good nutritious soil. To maintain humidity, it is necessary to spray the plant with settled water. They don't like roses and overflow. They need good drainage; there should be no stagnation of water at the roots.

Garden roses

To successfully grow healthy bushes with long-lasting flowering, you need to plant flowers in sunny areas with good air circulation. There can be many reasons why rose leaves fall in the open ground: errors in care, infectious diseases, pest invasion.

Pests

Garden roses have many enemies among insects. In dry weather, the leaves can be attacked by the rose cicada and they feed on the sap from the lower surface of the leaves, causing them to dry out. They spread very quickly throughout the rose garden, so at the first sign of insects it is necessary to start spraying with herbal infusions or insecticides.

Fertilizer application

Roses need a lot of minerals and trace elements. Lack of nutrients can lead to the development of diseases.

Chlorosis: Occurs due to magnesium deficiency. It affects old leaves first, then young ones. The edges remain green, and yellow and red dead spots appear between the veins. Then the leaves fall off. To eliminate chlorosis, plants must be fed with magnesium sulfate.
Nitrogen deficiency. Leaves turn light green or yellow and their growth slows or stops. The problem usually occurs in early summer. To correct the situation, nitrogen fertilizers must be applied.
Iron deficiency. The surface of young leaves turns yellow, but the veins remain green. Often occurs on limed soils. To replenish the missing element, you need to treat the plants with a solution of iron sulfate or apply a complex fertilizer.
Manganese deficiency manifests itself in a similar way, but affects the old leaves first. It is necessary to add potassium permanganate or

Infections

The most common infectious disease is black spot. Markings appear on both leaves and petioles. Yellow areas form around them. They grow, causing the entire leaf to turn yellow and fall off. Spread by spores in warm, humid weather. Weakened, bare plants do not tolerate winter well, so infection must be combated.

Affected leaves and plant debris should be raked and burned, and the plants should be treated with fungicides.