Squash – Bumpy Skin
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Q: This summer I had knobby squash. I know what old squash looks like. These are immature in size, young, not very fat, but the skin looks like we waited too long to pick it. Why?
A: This looks like squash bug damage. These insects are kin to stink bugs, The insert a sharp “nose” into young fruit and make bumps and knobs on the skin.
To control them, use a product labeled for garden insect control like acetamiprid (click for sources) or cyfluthrin (click for sources)
Other, mostly organic controls, include these garden insecticides (click for sources)
See also