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Various diseases of ornamental crops in the conditions of home gardening are quite common. Powdery mildew on roses is one of the most common diseases, so the gardener must be able to timely detect the lesion and apply the most effective measures to combat pathogenic microflora.
Powdery mildew on rose bushes appears from mid-summer to early autumn. In the middle zone of our country, the first signs of the disease often appear already in the middle of the last spring month.
The disease provokes a parasitic fungus called Sphaerotheca pannosa. Pathogenic microflora is capable of affecting any aerial parts of the decorative culture: thorns, buds, young leaves and shoots. It is not difficult to recognize powdery mildew on rose bushes. On the surface of the affected parts of the plant, a characteristic, off-white, powdery coating appears.
The result of the lesion is a deterioration in photosynthesis, a change in the shape and staining of leaves of the ornamental shrub. At later stages, drying and falling of both foliage and unopened buds may occur. If the fungus parasitizes on the shoots, then the decorative culture has a very depressed appearance and quickly loses its attractiveness.
In the summer, a fungal infection spreads through spores or conidia. In autumn, the fruiting bodies of the fungus are already quite well developed, which allows the pathogen to easily overwinter in sleeping buds or in microcracks on the shoot bark. The disease can be triggered by:
As a rule, tea-hybrid varieties, as well as repair roses, are most often affected by powdery mildew. A rose bush weakened by the disease can freeze in the winter. To prevent the defeat of rose bushes Sphaerotheca pannosa, it is necessary to comply with agricultural technology, to plant plants in well-lit and ventilated spaces, to conduct timely preventive measures, as well as to process the decorative culture with chemicals or time-tested folk remedies.
It should be borne in mind that even the most effective folk remedies against powdery mildew are sufficiently effective only as a preventative measure or in the early stages of the disease. Fight with solutions or infusions with a strong and neglected defeat is useless. In the best case, such treatment will allow for a while to stop the spread of the disease, but is not able to completely eliminate the problem.
|Name of facility||Preparation method||Application rules|
|Soapy soda solution||Dissolve 25 g of soda ash in 5 l of hot water and add 5 g of ground laundry soap||The resulting solution to process the aerial part of rose bushes twice at weekly intervals|
|Baking Soda Solution||Dissolve a tablespoon of baking soda and a teaspoon of liquid soap in 4 l of hot water||Carry out three-time processing of the aerial part of the decorative culture with an interval of 10 days|
|Milk serum||Dilute one part of whey in 10 l of water||Carry out three treatments of leaves and shoots during the week in dry and calm weather|
|Horsetail broth||100 g of chopped horsetail infuse for 24 hours in a liter of water, and then boil for a couple of hours, cool and strain||Before spraying, dilute the broth with water in a ratio of 1: 5|
|Soap solution with vitriol||Dissolve 50 g of grated laundry soap in 5 l of water, and dilute 5 g of copper sulphate in a glass of hot water. Combine both solutions and mix.||Use for processing the aerial parts of plants weekly for two months|
|Mustard infusion||Thoroughly dilute a couple tablespoons of dry mustard in a bucket of warm clean water.||A good result is given by both spraying and watering rose bushes a couple of times a month|
|Soapy ash solution||Pour a kilogram of wood ash with a bucket of warm water and insist for a week, then strain and add a little soap||Allowed weekly processing of the aerial part of the decorative culture|
|Garlic based infusion||Grind 50 g of garlic well and add cold water, then insist for 24 hours||Allowed weekly processing of the aerial part of the decorative culture|
|Onion infusion||100 g of onion husks to infuse in 5 l of water during the day, then add liquid or chopped laundry soap in an amount of 5 g||Carry out three-time processing of the aerial part of the decorative culture with an interval of 10 days|
If in the conditions of home gardening, rose bushes affected by powdery mildew can sometimes be treated with various folk remedies, then in large areas with roses, the technology of integrated protection of decorative culture is more in demand.
|Drug name||Cooking method||Application rules|
|Fundazole||Dissolve 10 g of the drug in a bucket of warm water||When the first symptoms of the disease appear, conduct four treatments of rose bushes|
|"Topaz"||Dilute an ampoule of 2 ml of the active substance in a small amount of water, and then add the volume of water to 10 l||The first treatment in the spring at the beginning of shoot growth, the subsequent - if necessary. Reprocessing plants no earlier than a couple of weeks after the first spraying|
|"Acrobat-MC"||50 g of the drug diluted in a bucket of warm water||The first treatment in the spring at the beginning of shoot growth, the subsequent - if necessary. Reprocessing plants a couple of weeks after the first spraying|
|Previkur||The working solution is prepared at the rate of 1.5 ml per 1 liter of water||Processing in the morning or evening hours in dry and calm weather at temperatures not lower than 12 ° С|
|"Speed"||2 ml per 10 l||Spraying during the growing season when the first signs of the disease appear, subsequent treatment with an interval of 14 days|
|"Vitaros"||2 ml per 1 liter||When the first symptoms of the disease appear, treat the rose bushes|
In conditions favorable for the growth and development of the fungus, the incubation period of powdery mildew is about a week. To prevent the spread of the disease on roses, it is necessary to apply preventive, that is, preventive, measures:
Important to remember, that excessive application of nitrogen fertilizers often causes the spread of powdery mildew, therefore, such dressings should be carried out according to the technology of growing decorative crops. Proper prevention will provide your roses with protection against the disease.