Canadian Forest Service Publications
Immediate and long-term effects of insecticide application on parasitoids in jack pine stands in Quebec. 1972. Price, P.W. The Canadian Entomologist 104: 263-270.
Issued by: Laurentian Forestry Centre
Catalog ID: 15829
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Parasitoid populations were sampled before, and for 4 years following, an aerial application of the insecticide phosphamidon to control a sawfly outbreak. Adult parasitoid mortality was high because of spraying, but a reservoir of parasitoids in host cocoons remained to repopulate the treated areas. In moister sites the number of species decreased and their relative abundance changed, but moderate numbers of parasitoids remained 4 years after spraying. In a dry site with little ground vegetation, none of the species present before spraying remained by the fourth year.