white powder on zucchini?

[84pagirl]

Last summer along with the blight on the tomatoes there was white powdery looking coating on my zucchini. I cut all those leaves off and they still grew, but what was that and how do I prevent it?

[rainbowgardener]

It's called powdery mildew. It's another fungal condition, and the same treatments that work against the blight (including milk solution and baking soda solution) work against the powdery mildew.

[84pagirl]

do you spray preventively or after the plants have it?