New stink bug invading Western Nevada |

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New stink bug invading Western Nevada

The Say’s stink bug has invaded yards and fields across Western Nevada. The Nevada Department of Agriculture and University of Nevada Cooperative Extension offices have received numerous calls about the insect. Residents of Smith Valley, Douglas County, Carson City, the North Valleys of Reno and Pershing County have expressed concern about the bug.

“The Say’s stink bug gets its name from an offensive odor released when disturbed,” said Jeff Knight, state entomologist at the Nevada Department of Agriculture.

“It develops on a weed called tumble mustard in disturbed and burned areas. As these areas dry up, the immature insects will migrate to adjacent greener areas. It may need to be controlled in these situations if numbers are high.”

Most over-the-counter products containing carbaryl or insecticidal soaps, registered for use in the yard, should control these insects, Knight said. For control in crop situations, the Pacific Northwest Insect Control handbook should be consulted. The handbook is available online at and is reviewed each year by Pacific Northwest entomologists.

As adults, the insects are good flyers and are highly attracted to lights. If high numbers are a nuisance around lights, changing the light to an amber or yellow color could reduce the problem.

This insect may have more than one generation per year in Nevada.