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PARASITISM OF OVERWINTERING PUPARIA OF THE CABBAGE MAGGOT, DELIA RADICUM (L.) (DIPTERA: ANTHOMYIIDAE), IN RELATION TO HOST DENSITY AND WEATHER FACTORS1

Published online by Cambridge University Press:  31 May 2012

W.J. Turnock ,
G. Boivin  and
J.W. Whistlecraft
W.J. Turnock
Affiliation:
Agriculture and Agri-Food Canada Research Centre, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
G. Boivin
Affiliation:
Agriculture and Agri-Food Canada Research Centre, St-Jean-sur-Richelieu, Quebec, Canada J3B 3E6
J.W. Whistlecraft
Affiliation:
Agriculture and Agri-Food Canada Research Centre, 1391 Sandford St., London, Ontario, Canada N5V 4T3
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Abstract

Puparia of Delia radicum collected in late autumn at Winnipeg and Portage la Prairie (Manitoba), St-Jean-sur-Richelieu (Quebec), London (Ontario), and St. John’s (Newfoundland) were parasitized mainly by Aleochara bilineata (Gyllenhal) (Coleoptera: Staphylinidae) and Trybliographa rapae (Westwood) (Hymenoptera: Cynipidae). At Winnipeg, St-Jean, and St. John’s parasitism by A. bilineata was high (<94%) and by T. rapae was low (<3%). At London, both parasitoids attacked less than 14% of the host puparia. At Winnipeg, host population density was related to parasitism by A. bilineata and to the temperature and rainfall during June and July. Parasitism by A. bilineata may be related to cumulative degree-days over 5°C during June and July at Winnipeg and during June and September at London. In Canada, the parasitoid complex is not effectively stabilizing host population density. The introduction of additional parasitoid species should be considered.

Résumé

Les puparia de Delia radicum recueillis à la fin de l’automne à Winnipeg et Portage-la-Prairie (Manitoba), à St-Jean-sur-Richelieu (Québec), à London (Ontario) et à St-Jean de Terre-Neuve étaient parasités surtout par Aleochara bilineata (Gyllenhal) (Coleoptera : Staphylinidae) et Trybliographa rapae (Westwood) (Hymenoptera : Cynipidae). À Winnipeg, St-Jean-sur-Richelieu et St-Jean de Terre-Neuve, le niveau de parasitisme causé par A. bilineata était élevé (<94%) alors que celui causé par T. rapae était faible (<3%). À London, les deux espèces n’ont été recontrées que dans 14% des pupariums. À Winnipeg, la densité de la population hôte était influencée par le parasitisme du staphylin, de même que par la température et les précipitations au cours de juin et juillet. Le parasitisme exercé par A. bilineata semble relié au nombre cumulatif de degrés-jour au-dessus de 5 °C au cours de juin et juillet à Winnipeg et au cours de juin et septembre à London. Au Canada, le complexe des parasitoïdes ne suffit pas à stabiliser la densité de la population hôte. Il faudrait examiner la possibilité d’introduire d’autres espèces de parasitoïdes.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 4 , August 1995 , pp. 535 - 542
Copyright
Copyright © Entomological Society of Canada 1995

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