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Symptoms of Powdery Mildew:

Identify powdery by the characteristic grey-white mildew that develops on any infected tissue (Figure 1). Main symptoms on leaves are irregular yellow blotches best seen on the upper surfaces and, on varieties like Chardonnay, with associated browning of the smallest (tertiary) veinlets on the under sides. The blotches soon show the typical white mildew as spots expand and merge across both surfaces of leaves. Eventually the whole surface is covered.

To see young mildew spots clearly, angle the leaf into the light; this makes the fungal sporulation more visible.

Source: Managing Powdery Mildew, Peter A. Magarey, Research Plant Pathologist, Magarey Plant Pathology, Australia.

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