Abstract
Colonies of the western harvester ant, Pogonomyrmex occidentalis (Cresson), treated individually, were more effectively controlled with Kepone®(decachlorooctahydro- 1,3,4-metheno-2 H -cyclobuta[ cd ]pentalen-2-one), aldrin, or dieldrin baits than with heptachlor or CS 202 [3 parts chlordane (100% assay) to 2 parts heptachlor (72% assay)] baits. Insecticide concentrations or 0.05%, 0.07% and 0.10% on the bait were more effective for colony control than the stronger concentrations; 0.12%, 0.25% or 0.50%. This result was due to rejection of the stronger baits by the ants. Colony control was equally good at bait rates ranging from 6.7 g to 40 g per mound and poorest at the 3.3 g per mound rate. In a second experiment mirex + corncob grits + soybean oil baits were more effective for P. occidentalis colony control than similar baits made with Kepone, sodium fluoroacetate (1080”), heptachlor or CS 202.
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