Problem Identifier Unit Screen//v.w/ RR Template

Problem Identifier Unit Screen//v.w/ RR Template Powdery Mildew

Problem
White or gray powdery patches appear on the leaves, stems, buds, and flowers. Leaves and flowers may be covered with the powdery growth. This material usually appears first on the upper surfaces of the older leaves. The affected plant parts may turn yellow or brown, and shrivel up and die.

Analysis
Powdery mildew on African violet is caused by a fungus (Oidium species). The powdery patches consist of fungal strands and spores. The spores are carried by air currents to healthy leaves and flowers of the same plant and to other African violets. The fungus saps plant nutrients, causing yellowing or browning of the tissues. Dim light, warm days, and cool nights encourage the growth of powdery mildew.

Solution
Spray with a treatment containing thiophanate-methyl. Remove infected flowers and flower buds and badly infected leaves. Keep plants in bright, indirect light away from cold drafts.

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