Abstract
Research on the control of the western harvester ant, Pogonomyrmex occidentalis (Cresson), by treating mounds individually was carried out in 1962 and 1963. Of the insecticides tested, fenthion and Bayer 39007 (o-isopropoxy phenyl phethyl methylcarbamate), in water, when poured down the entrance of the mounds gave less than 70% control. Bayer 38920 (6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahy-dro-3-methyl-6,9-methano-2,4-benzodioxepin) provided no control. Mirex and ENT 27005 (1,2,3,4,5,6,7,8,8-nonachloro. 3a,4,7,7a-tetrahydro-4,7-methanoindane) on corncob grits mixed with soybean oil provided excellent control in southeastern Wyoming. Niether mirex (0.075 and 0.15%) nor ENT 27005 (0.075%) gave acceptable control in central Wyoming. Later tests in central Wyoming with Kepone® (decachlorooctahydro-1,3,4-metheno-2H-cyclobuta [ cd ]pentalen-2-one) Ant and Roach bait (0.125%) and mirex (0.125%) with peanut-meal base provided better control than was obtained with other bases. Excellent control was obtained with mirex when tallow was substituted for soybean oil on the corncob-grit bait.
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