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

Fig. 4. Viability of sporangia exposed to a vineyard canopy environment on a hot, dry day (high temp = 36.5°C, RH = 15%) vs. cooler, cloudy day (high temp = 27.8°C, RH = 72%).



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