COSEWIC Assessments

COSEWIC Assessment Summary and Status Report: Rusty-patched Bumble Bee Bombus affinis

Assessment Summary – April 2010

Common name
Rusty-patched Bumble Bee

Scientific name
Bombus affinis


Reason for designation
This species, which has a distinctive color pattern, was once commonly found throughout southern Ontario. Active searches throughout its Canadian range have detected only one small population over the past seven years which suggests a decline of at least 99% over the past 30 years. It is threatened by disease, pesticides, and habitat fragmentation, each of which could cause extirpation in the near future.

Ontario, Quebec

Status history
Designated Endangered in April 2010.


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Contact Person(s)

COSEWIC Secretariat
c/o Canadian Wildlife Service
Environment Canada
Ottawa, ON
K1A 0H3
Tel: 819-938-4125
Fax: 819-938-3984
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Related Species


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