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Striped Cucumber Beetles in Cornfields and Soybean Fields

June 15, 2001
We have received reports of striped cucumber beetles in cornfields and soybean fields. These beetles closely resemble western corn rootworm adults. Striped cucumber beetles do not cause damage to corn and soybean, so don't be alarmed by the presence of these beetles in your fields. Unmated striped cucumber beetles overwinter as adults, emerge from hibernation in early April in central Illinois, and become active when temperatures reach 55°F. However, they do not fly if temperatures are below 60°F. The unusually cool weather this spring may have delayed their appearance until now. Striped cucumber beetles are slightly smaller (1/5 inch long) than western corn rootworms (1/4 inch long). The underside of the striped cucumber beetle's abdomen is nearly black, and the underside of the western corn rootworm's abdomen is green to greenish yellow.--Susan Ratcliffe


Female and male western corn rootworm adults.


Striped cucumber beetles have markings on their forewings very similar to western corn rootworms.


The underside of the striped cucumber beetle's abdomen is dark, nearly black.

Author: Susan Ratcliffe


The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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