Downy Mildew starts on the undersides of leaves and it causes yellow spotting on the top sides of your squash, zucchini and cucumber plants. It likes 85%+ humidity and cool days or nights of 65-75 degrees F. It spreads by spores that establish in 7-10 days. It likesd water/moisture to spread. I should be sprayed about every 7 days until controlled.
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