Addressing the Gaps in our Knowledge of Grapevine Downy Mildew for Improved Forecasting and Management

Fig. 2. Decline of lesions on grape leaves. Young lesions support dense sporulation (A). Older lesions cease to support sporulation in the centers (B) and eventually the entire lesionceases to support sporulation (C).



Image from Plant Health Progress article:
Addressing the Gaps in our Knowledge of Grapevine Downy Mildew for Improved Forecasting and Management