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

By

Douglas, Hume
Dumont, Stéphane
Savard, Karine
Thurston, Graham S.
Light, Marilyn H. S., 1942-

Type

Article

Date of Publication

2022

Original Publication

ZooKeys

Volume

1128

Pages

19--31

Subjects

Biological control , invasive alien species

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1128.90016

 

Abstract

First North American records are presented forBruchus affinisFrölich, 1799 (Coleoptera, Chrysomelidae, Bruchinae), as confirmed by morphology from multiple sites in Canada: British Columbia, Ontario, and Québec. Diagnostic information is presented forB. affinisin North America. This insect is expected to reduce plant reproductive output in infestedLathyrus latifoliusL.,Lathyrus sylvestrisL., and other potentialLathyrus(Fabaceae) hosts. Impacts on broad bean (Vicia fabaL.) production are expected to be small. Potential reproductive impact on native North AmericanLathyrusspecies 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, teneralB. affinisindividuals insideLathyrusseeds 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,Lathyrusflowering 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 ofBruchus affinisin Canada, and caused about 10% mortality inB. affinisat our sites.