Life history and coldhardiness ofAthrycia cinerea (Dipt.: Tachinidae) in western Canada |
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Authors: | W J Turnock R J Bilodeau |
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Institution: | (1) Agriculture Canada Research Station, 195 Dafoe Road, R3T 2M9 Winnipeg, Manitoba, Canada |
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Abstract: | Athrycia cinerea Coq. is a univoltine parasitoid of the bertha armyworm,Mamestra configurata Walker (Lepidoptera: Noctuidae), in western Canada. This parasitoid overwinters as a pupa in the soil. These pupae are less sensitive than their host to
increased cold stress caused by lower temperatures or danger durations of exposure. Exposure to −7.5°C for 140 days did not
significantly reduce survival. Survival decreased with exposure to temperatures from −10 to −20°C, but survival was 48% even
after 40 days exposure to −20°C. The frequency distribution ofA. cinerea puparia per host is highly contagious. Other aspects of the life history are described.
Contribution No. 1403 Winnipeg Research Station. |
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Keywords: | Athrycia cinerea parasitoid Tachinidae Mamestra configurata life history diapause induction coldhardiness |
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