Powdery mildew or ashweed can appear on indoor plants, garden plants, and wild plants. Without treatment, berry bush or perennial flower can die in just one summer season. You can get rid of the disease using pesticides or folk remedies.
Spots of mycelium first appear on the leaves, and then the lesion covers the petioles, stalks and fruits. First of all, the infection spreads along the lower leaves, located close to the ground, since the fungal spores overwinter in the soil. Gradually, the plaque covers the entire plant. A white coating appears on the flowers, the leaves dry out, and the infected fruits crack and rot.
A dense coating of mycelium prevents cells from developing and feeds on their contents. As a result, the leaves dry out and the plant weakens. The disease is especially destructive for young shoots. Their cells have very delicate walls, which the mycelium destroys without difficulty.
Phytopathology can develop on most representatives of the flora. The ashtray is most noticeable on vegetable crops. Pumpkin, nightshade, onion, garlic, and beets suffer from it. The disease is rampant on tomatoes and. Recently, potatoes began to be affected.
Strawberries and raspberries suffer greatly from ashtray in rainy years. The disease develops quickly on black currants - already at the beginning of summer, the leaves can curl and become covered with a white coating.
On currants, ashtray is a frequent companion of aphids. Shoots weakened by sucking insects become especially susceptible to fungal diseases.
Plants with delicate, soft leaves are especially quickly affected.
From the rooms it is:
In the garden, the disease threatens primarily:
In forests and parks white coating regularly appears on oak and maple leaves. The danger of ashtray for forest species is that the fungus does not die even in the harshest winters and the next year continues to weaken the tree until, in the end, it leads to the death of the giant.
Powdery mildew is difficult to confuse with anything else. Grayish-white coating - very characteristic feature. If after some time dark brown or black balls appear on it, there is no doubt that the plant is affected by ashtray.
Ashpelt
It is important not to confuse powdery mildew with peronosporosis. These diseases are caused by microorganisms from different classes, manifest themselves differently and require different treatments.
With ashberry, the coating is snow-white, located on the upper surface of the leaf blades. Downy mildew manifests itself as a grayish-yellow coating, most often covering the underside of the leaves facing the ground.
Penosporosis on cucumber leaves
Microorganisms that cause disease:
The causative agents of the disease, cleistothecia, overwinter on fallen leaves. At the beginning of summer, the wind carries the spores. Once on the host plant, they germinate and the mycelium penetrates the leaf tissue.
Having grown well, the mycelium appears on the surface in the form of a white powdery or cobweb-like coating. Here, cleistothecia are formed on it - black or dark spherical tubercles.
Infected leaves overwinter under the snow. At the beginning of summer, the cleistothecia rupture, releasing spores on all sides, and the cycle repeats.
Disputes can germinate in sheet plates at certain temperature and humidity parameters. Plants are especially vulnerable when hot, dry weather gives way to rainy weather or changes begin between day and night temperatures.
The disease is promoted by the rapid growth of young shoots caused by excessive nitrogen fertilizing. Damaged, severely injured plants, for example, those that have undergone severe anti-aging pruning, lose immunity and are easily colonized by infectious agents.
Despite the rapid spread and detrimental effect on plants, getting rid of the disease is not difficult. The fight against the disease consists of following prevention and crop care rules.
When infection spreads, plants are sprayed with pesticides of chemical or biological origin.
Chemicals can be of systemic or contact action:
Effective against ashtray systemic drugs based on triazoles:
The fungus can adapt to chemicals, so next season the product needs to be changed. Triazoles are used for preventative treatments and as therapeutic fungicides in the early phase of the disease. Some are able to stop sporulation. But if spores have already formed, triazole fungicides will not help.
Then use sulfur preparations:
Sulfur releases vapors that penetrate the mycelium and destroy it. The drugs are effective at temperatures of +18…+27 degrees. At temperatures above + 30 degrees, the substance burns the leaves, which can result in their falling off.
Attention! Gooseberries cannot be treated with sulfur - the plant will die.
The preparations are not poisonous to bees, but can cause skin irritation in warm-blooded animals and humans.
Ways to combat the disease. Video:
Bacillus subtilis or Bacillus subtilis is a soil bacterium that produces antibiotics. She's in line biological drugs for plant protection.
The most famous biological product for powdery mildew among summer residents is Fitosporin M. This systemic bacterial fungicide can be used to treat garden, garden, indoor and greenhouse plants from a complex of diseases. The working substance of Fitosporin is the bacterium Bacillus subtilis. By releasing waste products, it suppresses the proliferation of mycelium.
Alirin is a biological product based on a special strain of Bacillus subtilis. The product is used to protect and treat cucumbers (greenhouse and in open ground), black currants, gooseberries, cereals, strawberries.
Products are produced from different strains of Bacillus subtilis to protect various crops from ash fly:
In addition to Bacillus subtilis, biological products may contain spores of the fungus Trichoderma and bacteria Pseudomonas.
Diseased bushes are sprayed clean water, then dust the leaves with ash powder, wrapping it in gauze. Ash sticks well to wet shoots. Plants should be left in the dust for 2-3 hours. During this time, the alkaline powder will destroy the mycelium. The leaves of ornamental crops, such as roses, which often suffer from powdery mildew, should be washed after 3 hours so that no unsightly spots remain on them. Vegetable crops can be left covered with ash until the first rain or watering.
You can get rid of the disease on flowers with soda ash:
Plants are sprayed every week in the first half of summer. The product is safe for the harvest; it can be used even if the berries and fruits have already begun to ripen.
An acidic environment affects the mycelium no less harmfully than an alkaline one. To combat fungi, you can use sour milk or kefir. The fermented milk product is diluted with water 1 to 9 and garden plants are treated.
The easiest way to defeat a disease is to catch its beginning, so it is important to regularly inspect the plantings. The first sign of the disease is slightly deformed leaves or shoots. At this stage, the plants can already be treated with a fungicide.
Since fungal spores overwinter on litter, the first preventative measure is to clean the garden and berry patch in the fall from fallen leaves. It is best to burn plant waste without putting it in a compost heap.
Powdery mildew prevention includes:
For preventive treatments, spraying with biological products containing Bacillus subtilis is used. It is noteworthy that prevention with biological products is possible during periods when plants are blooming, since it is not dangerous for pollinating insects.
♦ SIGNS OF PLANT DAMAGE:
Gradually, the whiteness takes over the stems and other parts of the indoor plant. Over time, the spots increase in size, the mycelium thickens (becomes felt), the plaque darkens and acquires a brownish color.
It should be noted that flowers can also be affected by downy mildew (downy mildew), external signs which are similar to real underwear. But, unlike real mildew, downy mildew in the form of a coating appears only on the underside of the leaf blade, then the spots turn yellow, increase in size and then acquire a brownish color.
♦ WHAT DAMAGE DOES IT DO TO A HOUSEPLANT?
Many buds flowering species do not open and fall off, the flowering period may not begin at all. The leaves of the plant gradually turn brown and become noticeably deformed, dry out and fall off.
The development of the plant noticeably deteriorates, growth stops. Soon all that remains of the plant are bare stems covered with a darkening coating. Decorative value the flower is completely destroyed.
- leaves affected by powdery mildew: photo
♦ WHAT CAUSE THE APPEARANCE OF POWDERY MILDEW?
◉ as a rule, powdery mildew appears on indoor flowers if the care regime at home is not followed. Promotes the appearance of leucorrhoea too much heat against a background of high humidity (70-80%);
◉ if drops of water remain on the plant for too long after watering and spraying;
◉ reduced turgor of the leaves and stems of the plant, as well as wilting caused by any disease;
◉ too vulnerable weakened plant damaged by such dangerous pests such as spider mites, flower thrips, scale insects, whitefly larvae, mealybugs or white aphids;
◉ incorrect feeding of the plant. Fungal spores (conidia) are carried through the air and land on the plant. With an excess of nitrogenous fertilizers and an insufficient amount of calcium in the soil, the plant’s resistance to the development of powdery mildew from conidia decreases.
♦ HOW TO PREVENT THE APPEARANCE OF POWDERY MILDW ON PLANTS?
❂ the best prevention of the disease is to organize proper and timely care for home flowers to make them as resistant to fungal attack as possible;
❂ do not forget to apply phosphorus-potassium fertilizers to the potting soil in a timely manner and observe the proportions when preparing the solution;
❂ stagnant air contributes to the rapid spread of powdery mildew throughout the plant. Ventilate the room more often, improve air circulation;
❂ severely damaged, dried, deformed leaves and shoots should be removed;
❂ useful for pollinating houseplants ground sulfur in summer period. It is enough to pollinate 1-2 times a month ( best option- 4-5 times throughout the summer).
♦ HOW TO COMBAT Powdery Mildew AT HOME?
➊ if you were able to promptly detect the first signs of damage to the laundry, then you can get rid of the fungus using traditional methods. For example, garlic infusion is very effective at the early stage of damage. To do this you need to grind 30 grams. garlic and stir in 1 liter clean water, and then put the product in a dark place for 24 hours. Spray the entire plant with a spray bottle 3 times with an interval of 1 week;
➋ one more good way treatment - a solution of soap with copper sulfate. Add 2-3 grams of copper sulfate and 30 grams to 1 liter of water. crushed laundry soap, mix everything thoroughly. After 12-14 hours, you can use the product by spraying the plant with a spray bottle. Treat at least 3 times with an interval of 4 days;
➌ fungicides against powdery mildew. If the plant is severely affected by powdery mildew without treatment with special chemicals not enough. Fortunately, most modern fungicides do not cause much harm to flowers. TO effective means against leucorrhoea include drugs such as Colloidal sulfur, Fundazol, Topaz, Skor, Vectra, Thiovit, HOM.
♦ WHAT HOUSEPLANTS ARE AT RISK?
Almost all popular types of potted flowers can be affected by the activity of powdery mildew. The most vulnerable include varieties with soft and delicate leaves -
Powdery mildew is a fungal disease caused by microscopic fungi living in the soil. The disease affects almost all crops, manifesting itself in the form of a white powdery coating on different parts plants. Leaves infected with powdery mildew gradually turn yellow and curl, and new ones appear already deformed. The disease takes over large areas, because of which the plant dies without timely treatment. Without action, it quickly spreads and infects other crops.
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The first sign of powdery mildew infection is a whitish coating of mycelium on the various parts plants. It is the result of the activity of powdery mildew fungi, which invade the culture tissue. In just a few days, the disease affects the lower tier of leaves, they lose turgor, turn yellow and gradually die.
Powdery mildew when zoomed in
If you examine the affected area under magnification, you will notice the formation of ulcers under the attached mycelium. Its cells corrode leaf tissue, so the plant looks sick. White plaque interferes with normal photosynthesis, which further aggravates its condition. To save the plant, it is necessary to get rid of the fungus at the first sign of infection.
Powdery mildew fungus is very common in soil, but the disease occurs only when suitable conditions. When warm and sunny weather and following all the rules of agricultural technology, the fungus does not manifest itself. For the development of a colony the following are necessary: favorable conditions:
The disease can develop when powdery mildew spores are transferred through the air from neighboring specimens or when watered with contaminated water. Sometimes it is enough to touch the diseased plant with your hands and then touch the healthy one.
The fight against this disease must be carried out comprehensively. First of all, it is necessary to correct errors in caring for the plant:
Without correcting errors in care, all further treatment methods will be useless, and symptoms of powdery mildew infection will appear regularly.
Powdery mildew can appear on different vegetable crops. Before use chemicals or folk recipes it is necessary to remove all diseased parts of the plants, and dig up the soil around them if possible.
If a white coating appears on cucumbers, treating with sulfur powder will help. For every 10 m², use 25 to 30 g of product. A good result is obtained by treatment with a solution of colloidal sulfur, for the preparation of which 30 g of the drug is diluted in 10 liters of water. A lasting effect can be obtained by using modern fungicides - "Oxychom" or "Topaz", which must be used in accordance with the attached instructions.
Powdery mildew on tomatoes can be eliminated by spraying with a solution of sodium humate once every 14 days. At the first signs of infection, a 1% solution of "Baktofit" gives a good result if you treat the diseased plant with it three times with an interval of 7 days. Treatment can be carried out with fungicides such as Quadris, Privent, Strobi or Topaz. To improve the “adhesion” of the solution to the treated plant, add Not a large number of silicate glue or laundry soap shavings.
If signs of infection are detected on zucchini, the area should be sprayed with Carboran, Kefalon or sodium phosphate, diluting them according to the instructions. Treatment is carried out once a week.
To destroy signs of disease on eggplants, you can use a solution soda ash at the rate of 25 g per 5 liters of heated water or any modern fungicide. It is required to carry out 4 or 5 treatments every 10 days.
With this disease, a white coating appears on strawberries on the underside of the leaves. Gradually they curl and acquire a bronze tint. Powdery mildew most severely affects the central part of the leaves and the mustache. In the presence of fungus, berries acquire a moldy smell and become covered with a white coating.
To prevent infection, strawberries need to be thinned and planted on time. For treatment, bushes must be treated with a 1% solution of colloidal sulfur. After flowering or harvesting, you can use Bayleton or Switch according to the attached instructions. During processing they affect not only top part leaves, but also the lower one.
The fungal disease affects not only vegetables or berries; flowers can also suffer from it. In mid-summer, a whitish coating can be seen on phlox. In this case, all infected parts must be cut off, and severely damaged plants must be completely destroyed. The remaining specimens should be treated with a 1% solution of colloidal sulfur. To prevent flower beds, it is necessary to mulch with peat or humus. In early spring in order to prevent the disease, it is necessary to carry out 3 treatments of phlox with a 1% solution of Bordeaux mixture with an interval of 14 days.
To prevent the development of powdery mildew on roses, the ground around the bushes should be cleared of weeds and loosened in time. In the fall after the sanitary pruning All plant remains must be burned and the soil must be dug up. At the first signs of disease, the bushes should be treated with Fitosporin-M, Maxim or Fundazol. In spring and autumn you can use the following solution:
To combat signs of disease on petunia, all infected parts of the flower are first removed and burned. After this, drugs such as “Skorom”, “Topaz” or “Previkur” are used. If a fungal infection appears on flowers grown in pots or containers, it is advisable to change upper layer soil onto soil that has been treated with Fitosporin-M.
On violets and violas, the disease spreads to the buds, foliage and stems. This usually happens due to heavy dew or when the soil is oversaturated with nitrogen. For treatment, it is necessary to use a solution of soda ash with the addition of soap or modern means- “Morestan”, “Kuprozan”, “Tsineb” or “Topsin-M”.
On initial stage illness or as a preventive measure, treatment with folk remedies gives very good results. If the pathology is in an advanced stage, then it will not be possible to completely get rid of the fungus on plants using such methods.
Among the most famous folk remedies are the following:
| Name | Preparation | How to use |
| Soda ash and soap solution | 5 l hot water; 25 g soda ash; 5 g liquid soap. Dissolve drugs in water | Cool the solution, spray the plant and top layer of soil. Treatment is carried out every 7 days 2-3 times |
| Copper-soap solution | Dilute 5 g of copper sulfate in 250 g of hot water. In another bowl, dissolve 50 g of soap in 5 liters of water. Carefully pour the first composition into the second, stirring constantly | The resulting emulsion is sprayed on infected plants. A total of 2–3 procedures are performed with an interval of 1 week. |
| Soda-soap solution | Dilute 0.5 tsp in 4 liters of water. liquid soap and 1 tbsp. l. baking soda | Spray the plants with the solution. Carry out 2–3 procedures with an interval of 1 week |
| Potassium permanganate solution | Dissolve 2.5 g of potassium permanganate in 10 liters of water | Spray the plants with the prepared solution. Perform 2–3 procedures every 5 days |
| Serum solution | Dilute whey with water in a ratio of 1:10 | When the serum gets on the plant, it forms a film that makes it difficult for the fungal colony to breathe. With this treatment, the plant receives additional nutrition. Spraying with a whey solution is carried out only in dry weather. Treatment requires 3 treatments every 3 days |
| Horsetail herb decoction | Pour 100 g of fresh grass into 1 liter of water for a day. Then boil for 2 hours, cool and dilute with water in an amount of 1:5 | For prevention, spraying is carried out regularly - in spring and summer. For treatment on initial stage carry out 3–4 treatments every 5 days |
| Mustard solution | Stir 2 tbsp in 10 liters of hot water. l. mustard powder | The cooled solution is sprayed or watered on the plants. |
| Ash-soap solution | 1 kg of ash is stirred in 10 liters warm water and leave for 3 to 7 days, shaking occasionally. Then the liquid is poured into a clean container, leaving the ash suspension in the bucket. Add a small amount of soap | The resulting solution is sprayed on the plants every 3 days. The remaining ash suspension is diluted with 10 liters of water and the bushes are watered |
| Cow dung infusion | Rotted manure is mixed with water in a ratio of 1:3. Insist 3 days | The resulting infusion is diluted in half with water and sprayed on the plants. |
| Garlic infusion | Grind 25 g of garlic and add 1 liter of water. Insist 1 day | After filtering, the bushes are sprayed with the solution |
- one of the most common and unpleasant diseases that affects a large number of plants. It is imperative to fight it, since the result of an advanced disease is the death of the plant crop. It’s especially unpleasant when an illness destroys beauty
Gardeners, gardeners and flower growers very often encounter powdery mildew, as it affects grain, fruit and berry crops.
This fungal disease is caused by a number of pathogenic fungi. If we talk about, then a fungus called “Sphaerotheca pannosaLew” settles on them. var. rosae Voron". As a result of its settlement on leaves, stems and flower buds, the plant loses decorative look, stops growing; its buds are deformed and do not open; the leaves turn brown, blacken and dry out. As a result, the death of the flower may occur. Even at the initial stage, the disease greatly reduces the immunity of plants, and they cannot tolerate unfavorable conditions. external conditions, winter cold. 
Important! Two types of roses are most susceptible to powdery mildew: hybrid tea and remontant.
The symptoms of powdery mildew are quite characteristic: they do not allow this disease to be confused with any other. When affected, plant organs are covered with a powdery, cobwebby grayish-white thick coating - mycelium. It looks like flour was poured onto the leaves. After the spores ripen, drops of liquid can be observed on the plaque - this is where the name of the disease comes from. Later, at the end of summer, the coating becomes brown, and small dark brown balls - spores - appear on the surface of the leaves and stems.
Usually, infection occurs in the first month of summer- it is at this time that the spores of the fungus are released, which previously overwintered in fruiting body on plant residues. It starts with lower leaves, gradually capturing the entire flower.
Favorable factors for spread are heat, high humidity air, sudden temperature changes between day and night. Typically, a temperature of 22°C or higher and an air humidity of 60-90% are sufficient. 
There are several reasons for the spread of the disease on roses:
Of course, as with any disease, it is better to prevent it than to deal with its consequences. Therefore, preventive measures come first when growing roses. 
These include:
According to reviews experienced flower growers, in the top five resistant varieties includes: Also used are 0.25% Benomyl, 0.4% Zineb, 0.1%. As a rule, treatment is carried out in the spring before flowering and in the fall after dropping the leaves, the interval between spraying is 10-14 days.
Powdery mildew prevention measures also include foliar feeding which should be carried out before flowering using a mixture of (0.3%) and (0.3%).
At the first symptoms of powdery mildew, it is necessary to begin treatment with folk remedies. Here are some effective recipes.
Recipe 1. Mix whey (1 l), (10 drops) in water (10 l). Use for spraying leaves and stems twice with an interval of 7-10 days.
Recipe 2. Mix soda (40-50 g), soap (40 g) in 10 liters of water. Spray twice every other week.
Important! Despite the fact that substances hazardous to human health are not usually used, the eyes, nose and mouth are neverthelessduring processingshould be protected so that solutions do not get on the mucous membrane and cause allergic reactions.
If folk remedies turn out to be helpless against powdery mildew on roses, it is necessary to move on to more radical control measures - spraying: drugs developed to treat fungal diseases.
On sale today big choice bio-fungicides and systemic fungicides.
