Western conifer seed bug
The western conifer seed bug (*Leptoglossus occidentalis*) is a species of true bug in the family Coreidae.
The western conifer seed bug (Leptoglossus occidentalis) is a species of true bug in the family Coreidae. It is native to western North America and has spread widely across eastern North America and to parts of Europe and other regions. It feeds mainly on seeds and developing cones of conifers and is often noticed as a nuisance when adults enter buildings to overwinter.
Description
The western conifer seed bug is a large, brown leaf-footed bug with a distinctive white zigzag marking across the wings and flattened, leaf-like hind legs. Adults are typically about 9–18 mm long and are often confused with other insects because of their shape and colour.
Distribution
The species is native to western North America but has expanded eastward across the United States and Canada. It has also been introduced to parts of Europe and has established populations in some other regions.
Life history and feeding
This insect feeds primarily on seeds and developing cones of conifers, especially pines and Douglas-firs. Feeding usually causes little or no significant damage to healthy trees, though heavy seed-feeding can reduce some seeds.
Human interactions
Western conifer seed bugs commonly enter homes and other buildings in autumn to seek overwintering sites. They do not bite or sting, do not damage structures, and are mainly considered a nuisance pest.
Key facts
- It is a true bug, also known as a leaf-footed bug.
- Adults are reddish brown to brown and have leaf-like expansions on the hind legs.
- It feeds mainly on pines, Douglas-firs, and other conifers.
- It is generally harmless to people, pets, and buildings.
- It often enters homes in late summer and fall to overwinter.
The species is present in Canada, including provinces such as Ontario, Québec, New Brunswick, Nova Scotia, and Prince Edward Island, where it is mainly encountered as an overwintering nuisance in homes and buildings.
Frequently asked questions
What is the western conifer seed bug?
Where is it native to?
What does it eat?
Is it harmful to people or homes?
Why do people find it in houses?
Does it smell?
References
- Wikipedia — https://en.wikipedia.org/wiki/Western_conifer_seed_bugSupports: Scientific name, family, native range, introduced range, and general description.
- Royal Horticultural Society — https://www.rhs.org.uk/biodiversity/western-conifer-seed-bugSupports: Identification features, size, feeding on conifer cones, and presence in Europe.
- Montana State University Extension — https://urbanipm.montana.edu/entomology/resources/fact-sheets/nuisance_insect_pests/western.conifer.seedbug.htmlSupports: Size, feeding on pine and Douglas-fir seeds, overwintering in residences, and lack of significant tree damage.
- Michigan State University Extension — https://www.canr.msu.edu/resources/western-conifer-seed-bugSupports: Western origin, eastward spread, and nuisance entry into homes.
- Utah State University Extension — https://extension.usu.edu/planthealth/ipm/structural-pest-id-guide/western-conifer-seed-bugSupports: Identification, host plants, indoor overwintering, and lack of threat to human health.
- University of Minnesota Extension — https://entomology.umn.edu/western-conifer-seed-bugSupports: Description, feeding on cones and needles, and nuisance status indoors.