White spots - Knowledgebase Question

Holt, Mi
Question by Lyssys
August 2, 2010
Why would I have white spots/fungus on the leaves of my zuccini plants?


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Answer from NGA
August 2, 2010

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What you describe sounds like powdery mildew and if so, it is extremely difficult to control once established. If only a few leaves have spots, cut them off the plant and remove them from the garden. Once a plant is fully involved, there's just no stopping the disease. There are some resistant vegetable varieties so be sure to choose those next time you plant. Removing affected plant parts as soon as you see them and using a fungicide can sometimes protect unaffected plant parts, but it doesn't always work. Use a general purpose vegetable garden fungicide. If you don't see an improvement, I'd remove the plants from the garden before the disease spreads to nearby plants. Best wishes with your zucchini!

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