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Indirect effects of ivermectin residues across trophic levels: Musca domestica (Diptera: Muscidae) and Muscidifurax zaraptor (Hymenoptera: Pteromalidae)

Published online by Cambridge University Press:  09 March 2007

K.D. Floate  and
A.S. Fox
K.D. Floate*
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Alberta, T1J 4B1, Canada
A.S. Fox
Affiliation:
Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Alberta, T1J 4B1, Canada
*
* Fax: (403) 382 3156 E-mail: floatek@em.agr.ca
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Abstract

Common house flies, Musca domestica Linnaeus, were reared to pupation with exposure to ivermectin, washed, and then exposed to parasitism by Muscidifurax zaraptor Kogan & Legner. Pupae exposed to ≥ 0.25 ppm ivermectin produced 63% fewer parasitoids than did control pupae. Pupae exposed to 0.01 ppm ivermectin produced 23% more parasitoids. Exposure to 0.10 ppm ivermectin had no detectable effect. Treatments did not affect the developmental time of male or female F1parasitoids. Treatments did not affect the production of adult F2 progeny by F1 females, nor the sex ratios of these offspring. This study documents an indirect effect of ivermectin residues across trophic levels. It identifies altered host quality as another mechanism by which faecal residues of ivermectin may affect insect activity in dung of treated cattle. The importance of this phenomenon under field conditions is undetermined.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 3 , March 1999 , pp. 225 - 229
Copyright
Copyright © Cambridge University Press 1999

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