As we move into cooler nights, we notice the leaves of our squash and cucumbers are beginning to be covered with powdery mildew, especially those close to the ground. One of the gardeners has addressed this problem in her own garden by trimming away older leaves, trimming away overlapping leaves, and growing the plant up a support. All this improves air circulation. We will explore this and other methods in our garden next season. Our hope is to extend the growing season for these crops. Although one strategy is to spray, we do not use chemicals at Gallucci.
Here is a link to the WSU Hortsense page on this problem: http://hortsense.cahnrs.wsu.edu/Search/MainMenuWithFactSheet.aspx?CategoryId=5&PlantDefId=55&ProblemId=219