Grape Pests & Diseases
The University of California has an extensive Integrated Pest Management (IPM) website with a comprehensive section for grapes, including a year-round IPM program and guidelines. The UC IPM guidelines are an excellent source of information on managing pests. It includes the UC's official guidelines for monitoring pests and using pesticides or nonpesticide alternatives for managing insect, mite, nematode, weed, and disease pests.
Common Foothill Grape Insect & Mite Pests
Gills mealybug crawlers
Powdery mildew on grape cluster.