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Powdered Mildew/Blight

All of my zucchini and cucumber plants have powdered mildew. Can I stop it before it takes out my zucchini and cucumber plants? I also have blight on my tomatoes. What can I do to help them?
Submitted by BHGPhotoContest

Both powdery mildew and blight of tomatoes are fungal disease problems. And both can be controlled by periodic applications of fungicides labeled for their control. Results are best when applications begin as soon as signs of the diseases are observed.

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