Particularly dangerous for cultivated plants are the following pathogens:
- Genus Sphaerotheca species mors and pannosa;
- Genus Erysiphe species graminis and communis;
- Genus Uncinula species necator.
Prevention
This type of flower, like phlox, is rather unpretentious, but it is very interesting for fungal organisms. Downy mildew affects phlox very often. In this case, an effective means of prevention is sulfur. If during the summer the plant is treated with it several times, then powdery mildew treatment is not needed. Phloxes are pollinated with sulfur 2-3 times, adhering to an interval of 10-12 days. Such a procedure is carried out quite simply: a small bag is made of gauze, into which sulfur powder is poured, then with the help of this bag the bushes are pollinated with sulfur powder.
Starting from the end of May, it is also possible to spray phloxes with a 1% solution of soda ash or a copper-soap solution in the composition: copper sulfate - 25 g, soap - 200 g and water in a volume of 10 liters. The processing interval is one week.
A good nourishment and precaution is also a solution boric acid(you need to take it on the tip of a knife and stir it in a five-liter watering can) and a solution of pink potassium permanganate.
Do not forget about where and how to plant phloxes. The soil must fully provide the plant with nutrients and be loose enough for normal growth. It is not worth overloading the earth with nitrogen fertilizers - this will only contribute to the development of the disease. Conversely, potash and phosphorus fertilizers will become not only an additional source of nutrition for flowers, but also excellent remedies against fungal infections.
On phlox, powdery mildew spreads from the bottom up, so you need to periodically check the stems and lower leaves for the presence of the disease. If a white coating is found, in no case should you wipe it off - this will not eliminate the cause of the disease, but it can lull vigilance and interfere with the timely provision of assistance to a diseased plant.
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How to treat
If, nevertheless, phloxes are covered with a white coating, there is no need to despair - there is a treatment for flowers. There are many ways to fight disease. The only condition is that measures should be taken as soon as the disease manifests itself. The onset of the disease usually peaks in mid-summer.
In case they are hit small areas plants - a few buds or leaves, then they need to be carefully cut and rinsed with a flower of chemicals that can be purchased in specialized stores. These are various fungicides, as well as the well-known Bordeaux mixture.
The latter is nothing more than an aqueous solution, which includes vitriol and lime. Bordeaux mixture can be prepared at home, but then you need to correct proportions mix components: 100 g blue vitriol and 150 g of quicklime diluted in 10 liters of water. To obtain a 3% solution, you will need: vitriol in the amount of 300 g, lime - 450 g, water - 10 liters. It should be noted that vitriol is one of the most effective and available funds from a mealy disease.
Sometimes treatment is with antibiotics. The following agent has a good effect: terramycin 100 units / ml, penicillin 100 units / ml and streptomycin 250 units / ml in a ratio of 1: 1: 1. The mixture is dissolved in water and sprayed on the leaves.
- garlic tincture. Grind 40-50 g of garlic (cut with a knife, squeeze, scroll in a meat grinder). Pour 2 liters of water and let it brew for a day. With this solution, wipe the leaves of a diseased plant;
- manure infusion. Another excellent remedy for illness. To prepare it, you need to pour cow dung with water in a ratio of 1: 3 (that is, 1 part mullein to 3 parts water), leave it in the sun for 4-5 days to ferment, then strain. The resulting infusion is diluted with water 1: 1 and you can water the phloxes with it. In this case, the procedure is carried out in the evening to avoid direct sunlight;
- infusion of ash. Mix the sifted ash in the amount of 1 kg in 10 liters of water, preheated in the sun. Infuse the mixture for 5-7 days, then pour into a clean bucket. Such a remedy can not be filtered, it settles well enough and becomes almost transparent. You can also add some soap for better adhesion to the plant. Infusion can wipe the leaves or sprinkle them;
- infusion of rotten grass. To prepare such a remedy, weeds or any herbs are used. They are stirred, torn and poured hot water. The proportion of the solution is 1:1. Then they also defend for about 5 days, filter and use to treat flowers;
- horsetail decoction. As with other home remedies, powdery mildew can be successfully defeated with this decoction. 1 kg of fresh horsetail (150 g can be dry) should be soaked in 10 liters of water, stand for one night. Then boil and cook for 30 minutes. The broth is cooled, filtered, diluted with water (1:5). The tincture is ready;
- lactic acid bacteria. These can be found in every home - in sour milk, kefir or yogurt. Collecting the serum from them and diluting it cold water(1:10), the pathogen can be effectively eliminated.
The treatment of leucorrhoea with folk remedies is based on the action of microorganisms that multiply in in large numbers in decoctions and infusions during fermentation, and can suppress the growth of colonies of filamentous fungi (pathogens of powdery mildew), falling on the affected area of the plant. A huge plus is that this method of eliminating the disease does not harm the plant itself.
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Powdery mildew is a disease caused by fungal spores that quickly infect the entire plant. With untimely and improper treatment lead to his death. The disease is easy to recognize. It forms white coating which can be easily removed with a finger. But this method cannot cope with the problem, since after a certain amount of time the plaque appears not only on the leaves, but also on the stems and peduncles.
Over time, the old leaves turn yellow, and the new ones grow ugly and sick. If you do not resort to treatment, the plant dies.
What is powdery mildew and what does it look like
Powdery mildew, ashtray or whitewash affects grapes, trees, shrubs, vegetables and flower crops, as well as houseplants. fungal disease It was brought to Europe from America in 1907.
The fungus penetrates the cells of plants and sucks out all the juices and nutrients often occurs in autumn. On closer examination, you can see the sores in the places where the mycelium is formed. The plant looks sick, the lower leaves turn yellow, and new ones grow ugly. Cracks appear on fruits affected by the fungus, where rot pathogens penetrate.
A fungus can appear when:
Ways of transmission of fungal spores:
- through the hands (if you touch the infected culture, and then touch a healthy plant);
- by airborne droplets;
- when watering (if the water is infected with pathogenic spores).
Powdery mildew control methods
If true powdery mildew has formed, you must:
- get rid of all infected leaves and peduncles. With a large amount of damage, pruning is done. The more diseased parts removed, the higher the chance of healing;
- watering only after the top layer has dried;
- do not spray, as spores can be transferred to a healthy culture;
- with a strong defeat, remove it to a lighter one, sunny place until complete recovery;
- thin out thickened plantings and remove yellow leaves that touch the soil;
- during treatment, stop feeding, and fertilize with phosphorus-potassium fertilizers during remission.
Powdery mildew treatment with chemicals
There are many treatments for powdery mildew. One of them is through chemistry. These drugs include:
"Topaz" - refers to . The composition includes penconazole, which effectively fights the disease and prevents the onset of the disease.
For the treatment of currants, cucumbers, grapes, strawberries, etc. 1 ampoule is added to 10 liters of water, for indoor plants - to 5 liters.
You need to spray the plant only with a freshly prepared product. Re-disinfection is carried out after 14 days. The use of the old solution is unacceptable.
When processing, safety measures must be observed, all manipulations should be carried out with gloves, if the solution gets on the skin, it is necessary to immediately rinse it warm water with soap.
This drug is not harmful to humans and animals, will not harm insects and birds, but dangerous to fish.
"Tilt KE"- used to protect the plant from fungi and their spores. The composition of the drug includes propiconazole, which is a long-acting drug. With the help of "Tilt KE" there is a fight against the occurrence of the disease and the formation of spores. High temperature effectively affects the effect of the drug. The drug is not washed off by rain, as it is quickly absorbed into the tissues of the plant and remains on the ground.
The solution is prepared before use: 0.5 l of the solution is diluted in 1 l of water. The plant is not processed if the weather is very hot.
The therapeutic effect begins after a few hours and lasts 2 weeks. The drug has a negative effect on bees and fish.
All these products are sold in specialized stores. It is necessary to apply them only after carefully reading the instructions.
Folk remedies for powdery mildew
With soda and liquid soap
25 g of soda and 5 g of soap diluted in 5 l hot water. Gently stir, cool, spray and shed the topsoil. Repeat the procedure after 10 days.
Using whey
The plant is treated 3 times with a three-day interval. The solution is prepared in a ratio of 1:10. The plant is sprayed abundantly until a film appears. Thanks to the film, the mycelium does not have enough air, and it dies. Processing should be carried out in sunny and non-rainy weather.
A decoction of horsetail
Pour 1 liter of water with 100 g of fresh herb horsetail and leave for 24 hours. Boil the settled broth for 2 hours, cool and strain. Before use, the solution is diluted 1:5. Spraying is carried out 4 times every five days. The finished solution can be stored for a week.
Soap solution with the addition of copper sulfate
Dissolve 50 g of soap in hot water. In a separate container, mix 5 g of copper sulfate with a glass of hot water. The resulting solutions are carefully combined and thoroughly mixed. Treat the plant with the resulting emulsion several times with an interval of 7 days.
Solution prepared with dry mustard
2 tbsp. l. mustard add to 10 liters of hot water. The resulting solution is recommended to spray and water plants infected with powdery mildew.
Heat a bucket of water to a temperature of 40 ° C, add 1 kg of ash, mix and infuse for about a week. Strain the solution, add a small amount of liquid soap. Plants can be sprayed with a ready-made solution daily.
50 g chopped garlic add to 2 liters cold water. Infuse for 24 hours, strain and spray the plants with a clear solution.
Disease Prevention Measures
Any disease is easier to prevent than to treat it. In order for the plants to be healthy and delight with their flowering and fruiting, some rules must be observed:
Powdery mildew on cucumbers, control measures
Initially, the disease affects the leaves and flowers of cucumbers. To prevent the disease, it is necessary to mulch the plant with straw and prevent waterlogging of the air.
You can cure cucumbers from powdery mildew with the help of products containing fungicides, or folk methods. Before processing, all yellowed and infected leaves must be removed from the cucumber. A good effect occurs if the plant is powdered with dry sulfur (30 g 10 m²) or the beds are shed with colloidal sulfur (30 g per bucket of water). Before treating cucumbers for powdery mildew with chemicals, you must carefully read the instructions. When fruiting, it is better to process cucumbers with folk remedies.
Powdery mildew on cucumbers in disrepair: photo
Powdery mildew on grapes and its control
Powdery mildew that forms on grapes is called oidium. The first symptoms of the disease: plaque formation white color on leaves, stems and fruits. Damage to grapes can occur at a temperature of 25 ° C and air humidity of more than 50%.
The fight against the disease consists in spraying the plant with a sulfur solution - 100 g of dry sulfur per 10 liters of water, for prevention - 30 g per 10 liters.
During the fruiting period, the use of chemicals is not recommended. During the ripening of the berries, the diseased plant is treated with a weak solution of potassium permanganate by spraying.
Powdery mildew and its control pictures
Powdery mildew on indoor plants, methods of dealing with it
The disease affects indoor plants if proper care is not followed:
- increased air humidity;
- if, during watering, drops of water remain on the leaves for a long time;
- underdeveloped plant, or affected by other diseases;
- improper plant nutrition.
When a disease appears during the flowering period, the plant sheds buds, the leaves dry out and fall off. Growth stops and it dies.
Unfortunately, such an unpleasant disease as powdery mildew is quite common on many types of plants - both on indoor flowers and those that grow in open field. Among indoor plants, plants such as gerberas, Kalanchoe, cissus, and cineraria most often suffer.
Causes of Powdery Mildew on Houseplants
First of all, the stagnant wet air indoors and sudden temperature fluctuations. The spread of the disease is also carried out when the diseased and healthy plants come into contact, when watered, with air flow, as well as when carried by insects.
The cause of the development of the disease can also be excessive use nitrogen fertilizers, as well as a lack of calcium in combination with high temperature and humidity in the room. At the same time, abundant watering is not at all a reason for the development of powdery mildew.
The disease is caused by the fungus Sphaerothecarannosa. It has many varieties that affect the most various plants down to shrubs and trees.
How to deal with powdery mildew on indoor plants?
The very first thing to do when detecting characteristic white spots on the leaves and flowers of plants is to ensure the correct indoor climate, avoid sudden changes temperatures, at the first sign of the disease, cut off the affected shoots.
A diseased plant must be treated with one of the following solutions:
- manganese acid - 2.5 grams of manganese per 10 liters of water;
- soda ash with soap - 50 grams of soda, 40 grams of soap per 10 liters of water;
- tincture of garlic - insist 15 grams of chopped garlic in 1 liter of water during the day;
- preparations based on sulfur or copper - spray a diseased plant;
- preparations Topaz, Dektra, Skor, etc.;
- a mixture of antibiotics - tarramycin, penicillin and streptomycin in equal proportions.
How to get rid of powdery mildew on indoor plants at home? You can prepare a soda solution, for this 1 tsp. soda should be dissolved in 1 liter of water, add a few drops of ordinary liquid soap and spray the plant with this. But first, try this remedy on several leaves to make sure that such a treatment is harmless. You need to spray once a week until all signs of the disease disappear. However, remember that the treatment of powdery mildew on indoor plants with folk remedies is effective only in cases where the disease has not yet spread much and the degree of damage is minimal. If you see that the flowers are severely affected, you will need the use of "heavy artillery" - fungicides (Hom, Topaz, Vectra, Skor, Thiovit).
At the same time, it is extremely important to process, strictly following the instructions and observing all the precautions indicated in the instructions for the preparations. All of them are diluted in a large amount of water, so one ampoule can be divided into several applications.
Powdery mildew prevention
Means of prevention follow from the causes of the development of the disease. If it is said that 
that the cause is excessive humidity, high temperature and sudden changes in temperature, then the first preventive measures will be to avoid all these factors.
It is also possible, in order to prevent the development of the disease, to periodically change the soil, disinfect it, and thin out the leaves of plants. If there are small lesions, they must be urgently removed along with buds or leaves, avoid spraying such a plant and getting water on its leaves.
There is nothing complicated in the treatment and prevention of powdery mildew, the main thing is to consistently and regularly carry out all necessary procedures, until the plant is cured and continue not to bring it to this state.
But each plant with the same symptoms has its own pathogen. For example, American powdery mildew, which affects gooseberries, peaches and roses, is caused by three different sphere libraries.
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Powdery mildew disease - description
The first symptom of powdery mildew is a whitish coating of mycelium, on which drops of moisture appear. Powdery mildew appears on leaves and petioles, young shoots, as well as on the fruits and stalks of plants. Leaves and shoots located closer to the ground are infected first, and then the disease gradually covers the entire plant. On closer examination, you can see ulcers in the places of attachment of the mycelium, the plant withers and loses its attractiveness, since the fungus takes away its nutrition, and the leaves covered with plaque cannot cope with the process of photosynthesis. Defeat from powdery mildew leads to a decrease in winter hardiness of plants. Cracks form on diseased fruits, into which pathogens of rot penetrate during secondary infection. Active fungi can become under such conditions:
- during the rainy season or at temperatures between 15 and 27 ºC against high humidity air - 60-80%;
- with frequent temperature fluctuations;
- after radical anti-aging pruning;
- at high level nitrogen in the soil;
- with too dense landing;
- in case of violation of the irrigation regime - too frequent wetting of the soil or, conversely, with its regular drying out.
We will tell you how powdery mildew develops, how to deal with powdery mildew on different crops, and what preventive measures will help you protect your site from this disease.
Powdery mildew - control methods
If you are convinced that your plants are affected by powdery mildew disease, you need to cut off all yellowed and wilted leaves and flower stalks. Do not be afraid to drastically cut the plant - the more diseased parts you cut, the more likely the plant will heal. Treat the affected plant with a fungicide in such a way that the composition abundantly moistens all its ground parts - the medicinal solution should drain from the plant like water after a downpour. When treating plants in the garden, do not forget to spray the soil with fungicide in trunk circle or land in the garden.
What to do with powdery mildew on indoor plants? If the disease has manifested itself on house plants, treat the soil in which it grows and the walls of the pot abundantly with the fungicide. In case of severe infestation, remove the top layer of soil with mushroom mycelium colonies from pots or containers and replace it with a fresh, disinfected substrate.
Powdery mildew disease - prevention
The fight against powdery mildew is carried out in a complex way - in addition to the chemical treatment of plants, it is necessary to take the following agrotechnical measures:
- water the plants only after the topsoil dries;
- remove and burn all plant residues in the fall;
- observe crop rotation;
- grow powdery mildew-resistant varieties and hybrids;
- do not overfeed plants with nitrogen fertilizers, especially during the budding period;
- do not forget to apply potassium-phosphorus fertilizers that increase the resistance of plants to the disease;
- carry out spring sanitary pruning of trees and shrubs;
- preventive treatment of plants with fungicides in early spring and after leaf fall.
Also, for preventive purposes, powdery mildew treatment of plants is carried out. chemicals- for example, three or four times pollination with sulfur or three times treatment with copper sulphate, Bordeaux liquid or other preparations of a similar effect.
Powdery mildew on vegetables
Powdery mildew on cucumbers
Treatment for powdery mildew of cucumbers can be carried out with folk remedies and fungicides. But the fight against powdery mildew on cucumbers is impossible without preventive measures. Powdery mildew prevention consists in observing the agricultural practices of the culture and treating the beds three times with Quadris in accordance with the instructions.
But sometimes, despite all your precautions, the disease still manifests itself. How to treat powdery mildew on cucumbers? Measures to combat powdery mildew on cucumbers may include treating plants with folk remedies or chemicals, but in any case, before spraying, do not forget to remove all parts of the plant affected by the disease. Good results are obtained by dusting cucumbers with sulfur powder at the rate of 25-30 g per 10 m² or treating the beds with a solution of colloidal sulfur at the rate of 25-30 g per bucket of water. Spraying cucumbers with mullein also helps. If you decide to use fungicides, then Oxyhom and Topaz from powdery mildew in accordance with the instructions will be more effective than other drugs.
Powdery mildew on tomatoes
Powdery mildew on tomatoes occurs when two types of fungi are affected. One of them, Oidiopsis erysiphoides, is rare in the open field, it most often infects tomatoes in the greenhouse. This happens, as a rule, in March, if the greenhouse was not disinfected. The development of the disease can be observed on seedlings - its leaves begin to dry out from the edges, and if you are late with treatment, then the seedlings may die. The second powdery mildew pathogen, Oidiopsis taurica, appears yellow spots on the upper side of the tomato leaves, and a white bloom can first be found only on their underside, but over time it appears on top.
To the preventive measures against powdery mildew already described by us, we can add soaking tomato seeds before planting for seedlings for 42 hours in a solution of Immunocytophyte or Epin.
But if the defeat did happen, how to spray tomatoes from powdery mildew? It is advisable to treat seedlings with a solution of sodium humate, which completely inhibits the germination of conidia of the pathogen. Spraying is carried out in accordance with the instructions once every two weeks. Get the job done well biological preparations from powdery mildew, for example, a 1% solution of Baktofit, which is used to treat tomatoes three times with an interval of 7-10 days, as soon as the first signs of the disease appear. The fight against powdery mildew on tomatoes is also carried out with the Planriz cultural liquid, which is used when the first signs of the disease are detected. Of the fungicides, Strobi, Topaz, Quadris, Thiovit Jet, Bayleton and Prvent are most often used. For better "stickiness" of the drug to the treated parts of plants, a little silicate glue is added to the fungicide solution or laundry soap.
Those who avoid the use of chemical pesticides in the fight against plant diseases can, in preventive and medicinal purposes apply processing of tomatoes with ten percent whey, skim or ash solution.
Powdery mildew on squash
If you find a white coating on the squash, cut and burn the affected leaves and shoots and dig up the soil around the infected plant. To destroy the fungus, spray the area with zucchini with a solution soda ash or cow dung, as well as ash solution. Of the chemicals used Kefalon, Carboran and sodium phosphate.
Treatment of zucchini for preventive purposes is carried out in early spring with a solution of Nitrafen, and therapeutic spraying with the chemicals already listed - before and after flowering. Plants are sprayed with fungicides at least three times after 7-10 days, and folk remedies should be applied every other day. It is better to spray zucchini in the evening in dry weather.
Powdery mildew on eggplant
You can destroy powdery mildew on eggplants with a solution of soda ash, which we wrote about in the section on zucchini, or with any fungicide, for example, Fundazol (10 g per 10 liters of water). It will take 4-5 treatments at weekly intervals.
Powdery mildew on onions
Onions are affected by downy mildew, or downy mildew. This dangerous disease also develops in conditions high humidity and low air temperature. The infection is carried by the wind or with raindrops, as well as with plant debris.
Powdery mildew control on shrubs and trees
Powdery mildew on currants
Powdery mildew on currants immediately catches the eye, and if you do not immediately fight it, by mid-summer the disease can affect the entire currant, and it does not matter which type of currant is affected: powdery mildew on blackcurrant is just as harmful as on red or white. The fight against powdery mildew on currants, as well as on other plants, is carried out by both folk and chemical means. The plant is treated from all sides, trying to ensure that the medicine is not only on the upper side of the leaves, but also on the bottom. To do this, you can use a spray gun or a soft brush. The procedure is best done in the evening, in dry weather. Sessions are repeated at least once a week for a month.
You can cure powdery mildew on currants with folk remedies - dusting with sulfur, spraying with soda ash, ash water, mullein solution, whey, a weak solution of potassium permanganate and other compounds, more detailed description which we will give in a separate chapter. Measures to combat powdery mildew on currants in the event of a total defeat by the disease may include the use of chemicals. How to treat currants from powdery mildew in this case? Effective treatment of bushes in the spring with copper sulphate (10 g per 10 l of water), Nitrafen or iron vitriol(30 g per 10 liters of water). During the budding period, copper oxychloride (30 g per 10 l of water) or one percent Bordeaux liquid is used to spray currants, and after flowering, soda ash from powdery mildew is used - two to three treatment sessions with an interval of 10 days.
And do not forget to remove all plant debris from under the bushes in the fall.
Powdery mildew on gooseberries
Since currants and gooseberries are relatives, the methods of dealing with powdery mildew on gooseberries are the same as on currants. From folk remedies for the treatment of gooseberries and currants, whey, kefir or yogurt, mullein, soda ash or baking soda, a decoction of horsetail, tansy, infusions of rotten hay are used, onion peel, wood ash. Of the chemicals, the most effective in combating the disease on currants and gooseberries are solutions of ammonium nitrate, Gaupsin and Trichodermin. By the way, Fitosporin from powdery mildew is used with the same result as from phytophthora.
Powdery mildew on grapes
Powdery mildew that affects grapes is called oidium. The primary signs of the disease are still the same - a whitish powdery coating on the leaves, shoots, stems and fruits of the plant. Conditions that stimulate the development of the disease are temperatures of 18-25 ºC against the background of high humidity, but rains, on the contrary, slow down the spread of the disease. How to deal with powdery mildew on grapes? In the hot season, when the air temperature is above 20 ºC, grapes are sprayed with sulfur: for preventive treatment, 25-40 g, and for therapeutic treatment, 80-100 g of sulfur is dissolved in 10 liters of water. In cooler weather, colloidal sulfur or other sulfur preparations are used.
However, during fruit ripening, use chemicals highly undesirable - stop processing grapes with substances toxic to humans should be at least a month before harvest. How to treat grapes from powdery mildew during the period of filling and ripening of berries? Try spraying the plant with a pale pink solution of potassium permanganate - this measure will restrain the development of the disease, and when the crop is harvested, it will be possible to continue treating the grapes with chemicals.
What powdery mildew fungicides can be used to treat grapes? Best of all in the fight against oidium, the drugs Quadris, Thiovit Jet and Topaz have proven themselves.
Powdery mildew on an apple tree
Strong development of powdery mildew on apple trees can cut yield levels by half. In addition, the resistance of trees to cold weather may also suffer. Powdery mildew poses the greatest danger to nurseries, as it can quickly spread to trees growing close together. How to get rid of powdery mildew on apple trees and other fruit trees? Most effective way- treatment of plants with colloidal sulfur, soda ash with soap or copper oxychloride every 3-4 days. It is effective against powdery mildew on Topaz apple trees, and it is necessary to start treatment with this drug for preventive purposes from the very beginning of the growing season, and if signs of the disease are detected, 3-4 treatments with an interval of 6-12 days will be needed.
To prevent the spread of the disease, severely affected leaves and shoots must be removed and burned before treatment.
Powdery mildew on strawberries
Powdery mildew on strawberries is manifested by a white coating on the underside of the leaves, from which they gradually become leathery, and their edges curl and acquire a bronze color. A powdery coating is more pronounced on the central leaves and mustaches of strawberries. The berries are also covered with a whitish bloom and smell like mold.
To avoid the threat of disease, do not let the strawberries grow too densely, thin them out and plant them in a timely manner. As a treatment for powdery mildew on strawberries, bushes are treated with a one percent suspension of colloidal sulfur or TMTD, as well as Switch, Bayleton, Quadris, or Fundazol after flowering and after harvesting. When processing, try to get the drug not only on the upper, but also on the underside of the leaves.
Powdery mildew on flowers (garden)
Powdery mildew on phlox
Powdery mildew damages not only vegetables, berries, fruits, fruit trees and shrubs, but also garden flowers. For example, in the middle of summer, a white coating may appear on the leaves and stems of phlox, which gradually darkens and becomes dirty brown. It does not add decorativeness to the flowers.
How to get rid of powdery mildew on phlox? Sick leaves and severely affected plants must be destroyed, and the rest should be treated several times at weekly intervals with a one percent solution of colloidal sulfur. For preventive purposes, flower beds are mulched with humus or peat, and in early spring, when the shoots rise to a height of 10 cm, phloxes are triple treated with an interval of 12-14 days with one percent Bordeaux liquid. To increase the resistance of flowers to powdery mildew, feed them with a complete mineral fertilizer.
Powdery mildew on roses
Due to powdery mildew, any flowers, including roses, can lose their decorative effect. With a strong defeat, the leaves of roses curl up, dry and fall prematurely, and the bare branches are covered with a felt coating, which does not allow them to grow and develop. To prevent the growth of fungus on roses, keep the soil around the bushes clean, remove weeds. In autumn, after leaf fall and sanitary pruning, rake and burn all plant debris, and dig up the soil under the bushes.
At the first symptoms of powdery mildew, start treating roses with colloidal sulfur, Fundazol, Fitosporin-M or Maxim. Powdery mildew in autumn and early spring is destroyed by the following composition: 15 g of copper oxychloride, 300 g of green soap and 50 g of soda ash are dissolved in 10 liters of water.
Powdery mildew on petunias
Powdery mildew and petunia are affected: a white coating forms on the plants, spreading over all ground organs. As a result of the development of the disease, the petunia begins to rot and dies. To cure the plant, it is necessary to remove and burn all infected areas, and then carefully treat the petunias with a fungicide - Topaz, Skor, Fundazol, Previkur. If petunias grow in pots or containers, you need to remove the top layer of soil from them and replace it with soil treated for powdery mildew with Fitosporin-M. Of the folk remedies for combating powdery mildew, soda-soap and ash sprays, as well as flower treatments with whey, potassium permanganate, garlic infusion and mustard solution, have proven themselves well.
Powdery mildew on violets
In viola, or garden violet, powdery mildew affects buds, leaves and stems. Most of the time this happens when dry. sunny weather with abundant morning dew or due to an excess of nitrogen fertilizers in the soil. The defeat of the disease leads to a loss of decorativeness by the plant and a reduction in the flowering period. For the treatment of powdery mildew, treatments are carried out with solutions of Topsin-M, Fundazol, Morestan, Ftalan, Kuprozan, Tsineb or soda ash with soap.
Powdery mildew on indoor plants
At home, plants such as begonia, cissus, saintpaulia, gerbera, rose and Kalanchoe can also suffer from powdery mildew. The cause of the disease is stale moist air, dry substrate and differences in night and day temperatures. The causative agents of the disease are transferred from a diseased plant to a healthy one by insects, air flow or by contact if the pots are too crowded. Signs of the disease (white powdery spots) appear on the buds and on both sides of the leaves, and as soon as you find them, immediately begin to destroy the fungus: powdery mildew on plants in the apartment, if delayed with its treatment, leads to sad consequences - loss of attractiveness and decay.
A solution of soda ash, potassium permanganate or an infusion of garlic is used to destroy powdery mildew pathogens, and in case of severe damage, they resort to treating indoor plants with fungicides such as Skor, Hom, Vectra, Bayleton, Fundazol, Vitaros, Topaz or Thiovit Jet. Solutions are prepared strictly according to the instructions.
As a preventive measure, one can consider the introduction of potassium-phosphorus fertilizers into the soil, compliance with the water balance and plant hygiene, as well as regular ventilation of the room.
Means for powdery mildew (drugs)
In the fight against fungal diseases, which is powdery mildew, the following fungicides are most often used from chemicals: Skor, Quadris, Hom, Vectra, Thiovit Jet, Fundazim, Fundazol, Vitaros, Bayleton, Ftalan, Cineb, Kuprozan, Topsin-M, Fitosporin -M, Previkur, Switch, Bordeaux liquid, copper sulfate, copper oxychloride, colloidal sulfur and others. These drugs are sold in specialized stores and are used strictly in accordance with the instructions. Treatment of indoor plants with fungicides is carried out outdoors in compliance with safety regulations. Fruit trees, shrubs, vegetables and berries are treated with fungicides only in cases of severe damage, but when the plants enter the fruit growth phase, the fungicide treatment should be stopped. With a slight defeat by the fungus, it is better to treat the plants with folk remedies.
Folk remedies for the fight against powdery mildew
There are many folk remedies for powdery mildew that are safe for humans and plants. For instance:
- soap-soda solution: dissolve 50 g of soda ash or baking soda and 20 g of liquid or grated soap in 10 liters of water and treat the plants at least twice at weekly intervals;
- whey solution: pour 1 liter of whey into 10 liters of water, stir and treat three times in dry weather with an interval of 3 days;
- kefir solution: mix 1 liter of fermented kefir or yogurt in 10 liters of water and treat the plants three times with an interval of three days;
- decoction horsetail: Pour 100 g of horsetail with one liter of water, leave for a day, simmer for two hours, cool, strain, dilute with water 1: 5 and carry out 3-4 treatments with an interval of five days. Undiluted, the decoction is stored in a dark, cool place for about a week;
- mustard solution: dilute 2 tablespoons of mustard powder in 10 liters warm water and spray or water the plants;
- potassium permanganate solution: dissolve 5 g of potassium permanganate in 10 liters of water. This solution stops the development of the disease and washes the fungus from the fruit;
- ash solution: 1 kg of wood ash is added to 10 l of water, stirred, infused for 7 days, carefully drained, 20 g of liquid or grated soap are dissolved in the infusion and the plants are treated with this composition every other day;
- mullein infusion: one part of cow dung is poured with three parts of water and infused for at least three days, then the infusion is carefully drained, the same amount of water is added to it and the treatment is carried out before flowering, after it and before leaf fall;
- garlic infusion: 50 g of garlic pulp (chopped cloves and shoots of garlic) is poured with two liters of water, insisted and filtered for two days. Use the infusion undiluted;
♦ SIGNS OF PLANT DEFECT:
Gradually, the linen captures the stems and other parts of the houseplant. Over time, the spots increase in size, the mycelium thickens (becomes felty), the plaque darkens and acquires a brownish color.
It should be noted that flowers can also be affected by downy mildew (peronosporosis), the external signs of which are similar to real underwear. But, unlike the real one, downy mildew in the form of a plaque appears only on the underside of the leaf blade, then the spots turn yellow, increase in size and then become brownish in color.
♦ WHAT DAMAGE DOES BELLOW DO TO HOUSEPLANTS?
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 noticeably deform, dry out and fall off.
The development of the plant noticeably worsens, growth stops. Soon, only bare stems remain from the plant, covered with a darkening coating. The decorative value of the flower is completely destroyed.
- leaves affected by powdery mildew: photo
♦ WHAT CAUSES POWDER DEW?
◉ as a rule, powdery mildew appears on indoor flowers when the home care regimen is violated. Promotes the appearance of whiteness too heat against the background of high humidity (70-80%);
◉ if there are drops of water on the plant after watering and spraying for too long;
◉ 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 like spider mites, flower thrips, scale insects, whitefly larvae, mealybugs or white aphids;
◉ incorrect feeding of the plant. Spores (conidia) of fungi are carried through the air and fall 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 POWDERY DEW ON PLANTS?
❂ the most the best prevention diseases - to organize the correct and timely care for home flowers to make them as resistant to fungi as possible;
❂ do not forget to apply phosphorus-potassium fertilizers to the potting soil in time and keep the proportions while preparing the solution;
❂ stagnant air contributes to the rapid spread of plaque with powdery mildew throughout the plant. Ventilate the room more often, improve air circulation;
❂ severely affected by linen, dried, deformed leaves and shoots should be removed;
❂ it is useful to pollinate indoor plants with ground sulfur in summer period. It is enough to pollinate 1-2 times a month ( best option- 4-5 times for the whole summer).
♦ HOW TO FIGHT POWDER DEW IN HOME?
➊ if you managed to detect the first signs of underwear damage in a timely manner, then you can get rid of the fungus with folk methods. For example, an infusion of garlic at an early stage of the lesion is very effective. To do this, grind 30 gr. garlic and stir in 1 liter pure water and then put the product in a dark place for 24 hours. Spray the entire plant from a spray bottle 3 times with an interval of 1 week;
➋ one more good way processing - a solution of soap with copper sulfate. In 1 liter of water, add 2-3 grams of copper sulfate and 30 gr. chopped laundry soap, mix everything thoroughly. After 12-14 hours, you can use the product by spraying the plant from a spray bottle. Treat at least 3 times with an interval of 4 days;
➌ fungicides against powdery mildew. With a strong defeat of the plant with powdery mildew, treatment with special chemical agents is indispensable. Fortunately, most modern fungicides do not cause severe damage to flowers. TO effective means against leucorrhoea, drugs such as Colloidal sulfur, Fundazol, Topaz, Skor, Vectra, Thiovit, HOM can be attributed.
♦ WHICH HOUSEPLANTS ARE AT RISK?
Almost all popular types of potted flowers can be affected by the activity of powdery mildew fungi. The most vulnerable include varieties with soft and tender leaves -