Georgia Pesticide Applicators Practice Exam

Which environmental condition favors the infection of Powdery Mildew?

1. High humidity

2. Low temperatures

3. Direct sunlight

4. Windy conditions

The correct answer is: High humidity

Powdery mildew thrives in conditions of high humidity, which is instrumental in its infection and spread. This fungal disease typically prefers environments where moisture is present but not excessively wet. High humidity levels create an ideal habitat for the spores to germinate and establish infections on plant surfaces. While other conditions such as low temperatures, lack of sunlight, or windy conditions can influence plant health, they do not provide the specific moisture environment conducive to powdery mildew infections. Low temperatures can slow down the growth of fungi, while direct sunlight can help reduce humidity levels, causing the conditions to be less favorable for the mildew. Windy conditions may distribute spores but do not inherently support the environment needed for infection. Thus, high humidity remains the key factor in promoting the growth and spread of powdery mildew.