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Leptoglossus occidentalis

Western conifer seed bug

Description

Considered as the main seed predator in seed orchards of Western North America. This large-sized bug (1.6-2 cm long) has been accidentally introduced into northern Italy during the late 1990s (first record 1999). It then invaded the whole Central and Western Europe. Adults can fly over long distances but all life stages can also be dispersed with conifer trade. Overwintering occurs as an adult in bark crevices or into buildings where it can enter in large numbers in autumn, thus creating nuisance to people. There is one to two generations per year in the invaded area. Females lay groups of eggs on needles. Nymphs as well as adults feed on seeds by inserting their mouthparts through cone tissues but can also feed upon shoots. Feeding causes a significant reduction in seed viability. Feeds on cones, flowers and shoots of conifers.

Symptom

The large-sized bug. Damage to the cones. External damage is almost invisible.

Tree Species: Pine, Fir, Spruce

Part of a plant- attacked: Fruit / Seed

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: Yes

Present in EU: Yes

Seasonal frequency of occurrence

Seasonal frequency of occurrence