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Winter survival of nuisance fly parasitoids (Hymenoptera: Pteromalidae) in Canada and Denmark

Published online by Cambridge University Press:  09 March 2007

K.D. Floate*
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 First Avenue South, PO Box 3000, Lethbridge, Alberta, T1J 4B1, Canada
H. Skovgård
Affiliation:
The Danish Institute of Agricultural Sciences, Research Center Sorgenfri, The Danish Pest Infestation Laboratory, Skovbrynet 14, DK-2800 Kgs., Lyngby, Denmark
*
*Fax: 403 382 3156 E-mail: floatek@agr.gc.ca

Abstract

Independent studies were performed in Canada and in Denmark to assess the survival of parasitic wasps (Hymenoptera: Pteromalidae) wintering in puparia of house fly, Musca domestica Linnaeus (Diptera: Muscidae). Data in Canada were collected for Muscidifurax raptorGirault & Saunders, M. raptorellus Kogan & Legner, M. zaraptor Kogan & Legner, Nasonia vitripennis(Walker), Spalangia cameroniPerkins, Trichomalopsis sarcophagae (Gahan) and Urolepis rufipes (Ashmead) in three microsites at an outdoor cattle facility in southern Alberta. Survival was highest for N. vitripennis, T. sarcophagaeand U. rufipes, ranging from near zero to c. 7%. No survival was observed for S. cameroni. Daily mean values for ambient air temperature (DMAT) averaged about −3.5°C during exposure periods. Data for Denmark were collected for M. raptor, S. cameroniand U. rufipes in a dairy barn and in a swine barn. Survival of M. raptorand U. rufipes was higher than that of S. cameroniin the dairy barn (DMAT = 8.6°C), with the three species having similar survival in the swine barn (DMAT = 15.4°C). In both studies, parasitoids in egg stages were least likely to survive. These results identify the potential for T. sarcophagae and U. rufipes to be commercialized for use in northern climates as biocontrol agents for nuisance flies, compare directly the cold-hardiness of commercialized species (i.e. all of the above species excluding T. sarcophagae and U. rufipes), and document the importance of microsite on winter survival.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 2004

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