Powdery cucumber leaves
My cucumbers and squash are getting a white powdery look and dying off. What might this be and is there an organic remedy for this
Clinton County Pennsylvania
Your problem is likely Powdery Mildew. Organic controls include sulfur and copper. Fungicides work best when applied before disease starts or if started when disease first appears and continued sprays at 7 day intervals. You may want to remove severely infected leaves and begin protecting remaining leaves with fungicide.
Here is a link to Penn State's "Vegetable Gardening" book. Please see the section on "Cucurbits" for information about squash and cucumbers.