Powdery mildew

This pest is probably going to take down our "Little Dillicious" cucumbers. They're growing in pots and are from a free seed packet tossed in with our most recent Burpee seed order. The vines have been very pretty, with lots of flowers and tendrils, reminding one of the old packaging for Caswell-Massey cucumber emulsion. The cucumbers have been juicy and tasty, with a lovely aroma. They're still producing new leaves as fast as the oldest ones are going.