Downy mildew - affects many plants. Develop disease primarily on the leaves, but transferred to stems and flowers, under favorable conditions for its development. Originally on the upper side of leaves appear pale grayish-yellow spots with a slightly contoured, which increases with disease progression.
On the underside of the leaves on the affected area formed by a light gray powder consisting of fungal mycelium. Damaged leaves wither and dry up. Particularly ruthless fungus to roses, cineraria, cuttings of hydrangeas. They are affected by the fungus, all the leaves. Young plants and cuttings are all dying. Control measures Careful removal and burning of leaves patients and strongly affected plants.
Maintain low humidity, regular airing, thinning and clean the bushes. Change of soil and its disinfection. Spraying 1% Bordeaux liquid solution or kaltsionirovanoy soda (0.5%), carefully lower side of leaves. Processing starts at the first sign of disease and repeat every 10 days.