Powdery mildew on roses: control measures and methods of prevention



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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.

Signs of defeat

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.

Powdery Mildew: Ways to Combat

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:

  • sharp temperature fluctuations;
  • poor soil aeration;
  • insufficient lighting;
  • excess nitrogen-containing fertilizers;
  • insufficient calcium in the soil;
  • Too low or very high levels of humidity;
  • thickened landings.

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.

Effective 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 facilityPreparation methodApplication rules
Soapy soda solutionDissolve 25 g of soda ash in 5 l of hot water and add 5 g of ground laundry soapThe resulting solution to process the aerial part of rose bushes twice at weekly intervals
Baking Soda SolutionDissolve a tablespoon of baking soda and a teaspoon of liquid soap in 4 l of hot waterCarry out three-time processing of the aerial part of the decorative culture with an interval of 10 days
Milk serumDilute one part of whey in 10 l of waterCarry out three treatments of leaves and shoots during the week in dry and calm weather
Horsetail broth100 g of chopped horsetail infuse for 24 hours in a liter of water, and then boil for a couple of hours, cool and strainBefore spraying, dilute the broth with water in a ratio of 1: 5
Soap solution with vitriolDissolve 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 infusionThoroughly 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 solutionPour a kilogram of wood ash with a bucket of warm water and insist for a week, then strain and add a little soapAllowed weekly processing of the aerial part of the decorative culture
Garlic based infusionGrind 50 g of garlic well and add cold water, then insist for 24 hoursAllowed weekly processing of the aerial part of the decorative culture
Onion infusion100 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 gCarry out three-time processing of the aerial part of the decorative culture with an interval of 10 days

The best chemicals

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 nameCooking methodApplication rules
FundazoleDissolve 10 g of the drug in a bucket of warm waterWhen 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 lThe 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 waterThe 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
PrevikurThe working solution is prepared at the rate of 1.5 ml per 1 liter of waterProcessing in the morning or evening hours in dry and calm weather at temperatures not lower than 12 ° С
"Speed"2 ml per 10 lSpraying 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 literWhen the first symptoms of the disease appear, treat the rose bushes

Lesion prevention

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:

  • remove affected parts from the bush in a timely manner and destroy all infected plant debris by burning;
  • carry out regular removal of weeds in flower beds, rose gardens and flower beds;
  • follow crop rotation rules and do not re-plant plants susceptible to fungal infection;

  • acquire planting material of varieties that have sufficient genetic resistance to the most common fungal diseases, including powdery mildew;
  • provide rose bushes with a sufficient flow of air;
  • avoid thickening of plantings of decorative culture;
  • to carry out high-quality disinfection of the entire tool used in the process of trimming and for tying up shoots.

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.

Rose Disease: Treatment



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