Abstract
AbstractAn assay procedure for estimating the dosage–response relationship of early instar larvae of the onion maggot, Hylemya antiqua (Meigen), to insecticides is reported. The method gave reproducible results for diazinon on several test dates. The assay showed that maggots from strains collected at East St. Paul and Portage La Prairie, Man., tolerated 50 to 108 times as much heptachlor as a susceptible strain from Chatham, Ont. Previously, adults from the Manitoba strains had been shown to be highly tolerant to heptachlor. The potencies of Bayer 37289 and Bayer 25141 relative to diazinon were 0.5 and 0.1, respectively, for a heptachlor-tolerant strain. For NIA 10242 and Nemacide, equivalent values were 0.9 and 0.2 for this strain and 1.0 and 0.2 for the susceptible Chatham strain. The slight differences in the tolerance to these insecticides, shown for the two strains of larvae, were not associated with their tolerance to heptachlor.
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