University of Illinois Extension
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Stink Bug

Brown stink bug adult on broccoli. P. Nixon.

Brown stink bug adult on broccoli. P. Nixon.


4 (1 = rare 5 = annual)


2 (1 = very little damage 5 = plants killed)


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Stink bug adults are green or brown, flat-topped insects that are about 1/2 inch long. They are shield-shaped, with a large triangle on their backs. They lay their eggs in clusters on the leaves. Nymphs are rounded, variously colored, and look little like the adults until they approach maturity.

Stink bugs are a contaminant in harvested peas because the nymphs are the correct size and shape to be indistinguishable from the peas by mechanical harvesting equipment.  

Life Cycle

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Use a sweep net to scout pea fields within a few days of harvest to determine if a problem with stink bugs exists. If necessary, use an insecticide with a short preharvest interval to control the stink bugs. An alternative to an insecticide application is to adjust blowers and air cleaners within the processing plant to effectively remove the bugs.