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Powdery Mildew, Or Not?

June 26, 2015

Wondering if those white spots on your squash, zucchini, melon or cucumber is powdery mildew? Before you freak out and decide your crop is a goner, take a look at these two images:

Not Powdery Mildew on Squash

This is NOT powdery mildew. Rather, the slivery-white streaking & splotching radiating out from the veins of this zucchini leaf are natural coloring. It’s not disease!

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powdery mildew on squash

This spaghetti squash leaf is heavily coated in powdery mildew. The powdery-whiteness does not radiate from the veins of the leaves. Instead, it begins as spots on both sides of the leaf. Left in place, the entire leaf will be covered & eventually the entire plant will go ka-put.

Learn how to identify early infestations of this common squash problem and learn how we manage powdery mildew on all sorts of plants in this related post.

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