Powdery mildew
The temperature plays an important role in powdery mildew development. Powdery mildew favors cooler temperatures (65-77 degrees F). Temperatures above 30 degrees C appears to constrain disease development. Rainfall does not appear to affect the disease. But, it has been found that a shorter leaf wetness duration appears to be a driver of the disease. Additionally, low relative humidity is required for disease development.