Western Conifer Seed Bug

Leptoglossus occidentalis

The western conifer seed bug, sometimes called the pine-beetle, or 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 but has in recent times expanded its range to eastern North America, to include Ontario, Québec, New Brunswick, Nova Scotia, Prince Edward Island, Michigan, Maine, Pennsylvania, New York, New Jersey, Connecticut, Massachusetts, New Hampshire, Ohio, Indiana, Kentucky, and Wisconsin, and has become an accidental introduced species in parts of Europe and Argentina. Source

Where is the Western Conifer Seed Bug now?

In the last 8 weeks it was recorded 652 times across 22 areas (each area is a 5 degree square).

See the Western Conifer Seed Bug on the live map

How the Western Conifer Seed Bug moves through the year

Over the weeks it was present in the past year, its centre in Europe ranged from 46°N in September to 58°N in October, about 1,200 km apart.

When does the Western Conifer Seed Bug arrive?

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

Download every area as CSV · Review these arrival dates (researchers, ORCID sign-in)

Arriving at the same time in Europe

• Brambling Fringilla montifringilla
• Hawfinch Coccothraustes coccothraustes
• Yellow-browed Warbler Phylloscopus inornatus
• Song Thrush Turdus philomelos
• Green-brindled Crescent Allophyes oxyacanthae
• Pink-footed Goose Anser brachyrhynchus
• Eurasian Siskin Spinus spinus
• Chestnut Conistra vaccinii

Every arrival in Europe, month by month

Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured · How it compares with human observers