difficult to tell from the photo's but definitely looks fungal. grey mold, possibly powdery mildew.
first, always immediately remove any diseased foliage as soon as you can. there are lots of threads here about spraying for fungal problems. Better to water in the early morning so any water that is on the foliage dries before nightfall. also, a layer of clean mulch such as grass clippings or wood chips, etc, something clean and dry spread under the plants will help prevent splashing of soil with the fungus spores it contains up onto the foliage. it will also conserve moisture.
hope that helps.
KarenO
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