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.
Résumé
Athrycia cinerea Coq. est un parasitoïde univoltin deMamestra configurata Walker (Lep.: Noctuidae) dans l'ouest du Canada. Les deux espèces ont une diapause facultative de jours longs induite au cours de la vie larvaire. Les pupes de ce parasitoïde hivernent dans le sol. Ces pupes survivent mieux que leurs hôtes à des températures plus froides ou des durées d'exposition plus longues. L'exposition de pupes deA. cinerea à −7.5°C pendant 140 jours ne réduit pas significativement la survie. Celle-ci diminue avec la température lorsque l'on passe de −10°C à −20 °C, mais elle reste à 48% même après 40 jours à −20 °C. La distribution de fréquence des pupes d'A. cinerea dans leurs hôtes est contagieuse. Les auteurs décrivent d'autres aspects du cycle biologique.
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Contribution No. 1403 Winnipeg Research Station.
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Turnock, W.J., Bilodeau, R.J. Life history and coldhardiness ofAthrycia cinerea (Dipt.: Tachinidae) in western Canada. Entomophaga 37, 353–362 (1992). https://doi.org/10.1007/BF02373109
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DOI: https://doi.org/10.1007/BF02373109
Key-Words
- Athrycia cinerea
- parasitoid
- Tachinidae
- Mamestra configurata
- life history
- diapause induction
- coldhardiness