Why Do Squash Plants Turn Yellow?


Quick Answer

Squash bugs are a major cause of squash plants turning yellow. The bugs feed on the leaves and inject a toxin that causes the leaves to turn yellow and wilt. Without treatment, squash plants and surrounding plants may die due to squash bug infestation.

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Full Answer

Adult squash bugs and nymphs live under the plant''s leaves or other nearby coverings. Adults are about 5/8 of an inch long, and they can be picked off by hand if there are only a few. A large infestation requires an insecticide application on the underside of the leaves. Bugs that survive the growing season live throughout the winter, hiding in stacks of leaves or yard debris.

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