Western Conifer Seed Bug
Scientific Name: Leptoglossus occidentalis
Order & Family: Hemiptera (True Bugs), Coreidae (Leaf-footed Bugs)
Size: 16 to 20 mm (0.6 to 0.8 inches) in length
Natural Habitat
Found in coniferous forests and surrounding residential areas throughout North America and Europe.
Diet & Feeding
Feeds primarily on the sap of developing cones on evergreen trees like pines, Douglas firs, and spruce.
Behavior Patterns
They are active during warmer months and seek shelter in houses and buildings during late autumn to overwinter. They produce a distinct buzzing sound when flying and a foul odor if threatened.
Risks & Benefits
They are nuisance pests in homes but do not bite, sting, or cause structural damage. In forests, they can impact seed production, which can be a concern for tree nurseries.
Identified on: 3/31/2026