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My lemon cucumbers and courgettes have sucumbed to powdery mildew. I have read that spraying with 50% skimmed milk and 50% water will help solve the problem. Does this work? and if so why do the plants get this mildew anyway.?
DOesn't solve my problem of it raining so spray just washes off!!!Is BM no good for it then? I have been spraying the melons which are under cover and they don't seem to have it.