Water-soaked, gray-green blotches on leaves that turn brown with white fungal growth on the underside in humid weather; firm, greasy brown lesions on fruit; rapid whole-plant collapse.
Favorable conditions
•Cool, wet, humid conditions (10-24°C)
•Rapid spread by wind-blown spores over long distances
Management
1Apply a preventive fungicide program (chlorothalonil, mancozeb, or systemic oomycete fungicides) before symptoms appear
2Destroy infected plants and cull piles immediately