Apr 17, 2017
Cucumber (Cucumis sativus)-Powdery Mildew | Pacific Northwest Pest Management Handbooks
Source: Cucumber (Cucumis sativus)-Powdery Mildew | Pacific Northwest Pest Management Handbooks Symptoms First, tiny white superficial spots appear on leaves and stem. Spots become powdery white and expand to cover all portions of the plant. Sometimes the mycelium becomes covered with small black structures (chasmothecia) about the size of a pinhead but these chasmothecia are rarely…