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First North American records are presented for    Bruchus   affinis    Frölich, 1799 (  Coleoptera  ,   Chrysomelidae  ,   Bruchinae  ), as confirmed by morphology from multiple sites in Canada: British Columbia, Ontario, and Québec. Diagnostic information is presented for    B.   affinis    in North America. This insect is expected to reduce plant reproductive output in infested    Lathyrus   latifolius    L.,    Lathyrus   sylvestris    L., and other potential    Lathyrus    (  Fabaceae  ) hosts. Impacts on broad bean (   Vicia   faba    L.) production are expected to be small. Potential reproductive impact on native North American    Lathyrus    species remains unknown. The United States of America and Canada are now known to be home to 69–79 species of adventive   Chrysomelidae   including 16–18   Bruchinae  .We have found two dead, teneral    B.   affinis    individuals inside    Lathyrus    seeds imported from Europe, and we hypothesise that this species was introduced to Canada from Europe via seeds for planting sometime before 2007. At our study sites,    Lathyrus    flowering began in mid June followed by oviposition in late June with first adults emerging in late August, requiring about 60 days from egg to adult stage.    Dinarmus   basalis    (Rodani, 1877) (  Hymenoptera  ,   Pteromalidae  ) was newly recorded as parasitoid of    Bruchus   affinis    in Canada, and caused about 10% mortality in    B.   affinis    at our sites.

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﻿Palaearctic seed beetle    Bruchus   affinis    (  Coleoptera  ,   Chrysomelidae  ,   Bruchinae  ) new to North America, arrival, distribution, and autecology

﻿Palaearctic seed beetle Bruchus affinis ( Coleoptera , Chrysomelidae , Bruchinae ) new to North America, arrival, distribution, and autecology

Palaearctic seed beetle Bruchus affinis ( Coleoptera , Chrysomelidae , Bruchinae ) new to North America, arrival, distribution, and autecology