Western Conifer Seed Bug—Leptoglossus occidentalis

The western conifer seed bug has become a nuisance pest in many homes. The bugs enter buildings at the onset of cold weather in the late summer or early fall seeking a protected site to spend the winter. These bugs do not bite or sting, nor do they cause damage to the home. They will, however, give off a pungent odor if you handle them. They also may make a buzzing sound when flying.

western conifer seed bug
western conifer seed bug
western conifer seed bug

The adult western conifer seed bug is about 3/4 inch in length and is a dull brownish color. There is a faint white zigzag stripe across the midpoint of its upper surface. When the insect takes flight, it lifts the wings to reveal bright yellowish-orange areas on its back.

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Identification and Control Information

[Photos, left to right: Whitney Cranshaw, Colorado State University, Bugwood.org; Joseph Berger, Bugwood.org; David Cappaert, Michigan State University, Bugwood.org]