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OCCURRENCE OF CHALKBROOD CAUSED BY ASCOSPHAERA AGGREGATA SKOU IN A NATIVE LEAFCUTTING BEE, MEGACHILE RELATIVA CRESSON (HYMENOPTERA: MEGACHILIDAE), IN SASKATCHEWAN

Published online by Cambridge University Press:  31 May 2012

D.W. Goerzen ,
M.A. Erlandson  and
J. Bissett
D.W. Goerzen
Affiliation:
Saskatchewan Alfalfa Seed Producers' Association, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N 0X2
M.A. Erlandson
Affiliation:
Agriculture Canada Research Station, 107 Science Crescent, Saskatoon, Saskatchewan, Canada S7N OX2
J. Bissett
Affiliation:
Biosystematics Research Centre, Agriculture Canada, Research Branch, Ottawa, Ontario, Canada K1A 0C6
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Extract

The alfalfa leafcutting bee, Megachile rotundata (Fab.), is an important domesticated pollinator of alfalfa grown for seed in Canada. Chalkbrood, a disease caused by the fungus Ascosphaera aggregata Skou, has caused high mortalities in M. rotundata populations in the northwestern United States since 1972. Chalkbrood was found in Manitoba in 1982, Alberta in 1983, and Saskatchewan in 1984 (Richards 1985). Although subsequent surveys have indicated the presence of A. aggregata at high levels in some southern Alberta M. rotundata populations, the disease has been detected only sporadically and at low levels in Saskatchewan populations (Goerzen 1990).

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1269 - 1270
Copyright
Copyright © Entomological Society of Canada 1990

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References

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