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The western conifer seed bug, Leptoglossus occidentalis, sometimes abbreviated as WCSB, is a species of true bug (Hemiptera) in the family Coreidae.It is native to North America west of the Rocky Mountains (California to British Columbia, east to Idaho and Nevada) but has in recent times expanded its range to eastern North America, to include Connecticut and New Hampshire, and has become an ...


The western conifer seed bug’s consumption of Douglas-fir seeds and seeds of various other species of pine results in a substantial loss of seed crop. Thus, its direct economic impact is a reduction in the quality and viability of conifer seed crops.


Groups of Western Conifer Seed Bugs can enter a house, office building, or warehouse in the autumn through torn window screens, open doors, and chimneys. Though they are not known to bite, their presence causes uneasiness in many people. A type of Leaf-Footed Bug, Western Conifer Seed Bugs have long bodies and wide, flattened 'thighs'.


The western conifer seed bug has a body length of 3/4 of an inch with a brownish top. There are checkers of black and white along the margins of the lower portion of the back. But the fastest way to identify the western conifer seed bug is to look at the lower hind leg.


Western Conifer Seed Bug (Leptoglossus occidentalis) Identification. The Western Conifer Seed Bug isn’t seen very much during the summer months. Its summer habitat is among pine trees, Douglas firs and other types of cone-producing trees. The main diet of this bug comes from the seeds of the cones.


Often confused with the stink bug due to a similar shape and the ability to release a bitter smell, the West Conifer Seed Bug is a tree bug that feeds on the sap of conifer trees (its preference) or other trees. While their name implies they are a Western insect, they have extended their range across the US, and are now a common sighting in New England.


The Western Conifer Seed Bug also seeks the warmth of your home to bunker down in for the winter. It’s often misidentified as a Stink Bug, Cockroach or as the biting “Kissing Bug” due to its vaguely similar appearance. However, you will not find Kissing Bugs in New England and Stink Bugs are not as common to the region either.


Two species that are not stink bugs but may be found indoors during the winter are the Western Conifer Seed Bug and the Boxelder Bug. To distinguish these insects from the Brown Marmorated Stink Bug, look at the shaped and colors. The Western Conifer Seed Bug has similar coloring as BMSB but its body is elongated (almost U-shaped) with much ...


Western Conifer Seed Bug Pictures Below are images of the Western Conifer Seed Bug. Click on the thumbnails to enlarge the images or return to the article. 1 . Image courtesy of Molly M.. VIEW IMAGE. 2 . Image courtesy of Barb Z. from Rindge, NH. VIEW IMAGE. 3 .


The western conifer-seed bug (Leptoglossus occidentalis), a plant-eating insect, has been documented to have bitten a human, though researchers consider the bite to have been a chance occurrence and not the result of the insect targeting the human.(Photo credit: Joseph Berger, Bugwood.org)