What is wrong with my watermelon?

Rudolph, OH

Sorry the pictures aren't very clear! But the leaf edges are black, and there are very tiny white dots all over the dark edge of the leaf.
Please help! I don't know what is wrong with my watermelon.

Also, I have not found any pests on or around my watermelon plants.

This message was edited Aug 28, 2012 1:44 PM

Thumbnail by clarklindsd Thumbnail by clarklindsd Thumbnail by clarklindsd
Deep South Coastal, TX(Zone 10a)

The "white stuff" is powdery mildew. Neem oil spray will work to control it, do not spray in hot sun. If you are conventional gardener you can use a spray containing chlorothalonil to control mildew and other fungal diseases.
The black edges could be from the mildew or could be from something else like windburn or spider mites or another fungal disease.

Note: never use a spray containing sulfur on cucurbits. It works well for fungus, just not on cucurbits because they are sensitive to it.

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