Powdery mildew resistant plant seeds

If you plant fast-growing early-bearing crops then you should find that you get most of the crop before the mildew sets in. So, how about growing the apple cucumbers, and picking them small. You can probably find small fruiting varieties of summer squash, too. Have you tried the milk-and- water spray for mildew? Google for the recipe.

Zucchinis do succumb to mildew, but usually only after they have given the better part of their crop.

You are taking care not to dampen the leaves when you water the plants, are you? Squash and cucumbers might do better if you can grow them on a trellis, or on horizontal netting, to get them up off the ground so that air can circulate underneath to minimise humidity.