Diseases. Powdery mildew on leaves starts as white and may turn yellow and brown later. It is an unsightly fungal disease, but it is not deadly. Verticillium wilt is an incurable soil-borne fungal ...

Here's why cucumber leaves turn yellow and what to do to restore your plant's lush, green growth. 6 Reasons Your Cucumber Leaves Are Turning Yellow—and How to Fix Them Skip to main content ...