Powdery Mildew- A Vegetable STD

The 9 inches of rain we received in the past 4 days has given birth to a public health crisis for our cucumbers, squash and melons- powdery mildew.  Our veggies have entered a fungal brothel of no return.  Their leaves risk being left white, brittle and crumbly and their fruit limp and deteroriating.  If only a prophylactic campaign could save them!