The Western conifer seed bug (Leptoglossus occidentalis) is often found near white pine stands. It is approximately ¾ inch long, has a dusky brown to brownish black bodiy and an aggressive looking “beak” head and is similar in appearance to squash bugs. The upper surface of the abdomen is light yellow to orange. Alternating patterns of brown and black appear at the edges of their wing covers along their backs. While these insects look large and aggressive, they will not bite. They emit a powerful musky odor when disturbed or handled. Adults enter buildings seeking a site to overwinter after feeding on pine or Douglas-fir cones. They have migrated eastward across North America.
The best defense against fall pests that enters structures is to deny entry. Doors, windows, walls, soffits, etc. should all be examined and repaired to eliminate gaps especially South and West exposures. This is also a “green practice” for its energy conservation benefits. Vacuuming/sweeping them up cuts down on almost all but the most extreme problems. Adjusting lighting in infested spaces by turning off lights, darkening windows, using darker paint colors, or avoiding light colored exterior plantings also help these pests are attracted to lights and light colors. Don't use pesticides against these fall invaders; it provides only short-term relief and does not address bigger structural management issues.
Western Conifer Seed Bug. Photo from Whitney Cranshaw, Colorado State University, Bugwood.org.Information in part from Casey Sclar, IPM Coordinator, Longwood Gardens
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