Abstract
Pirimiphos methyl at a rate of 7.8 ppm was more effective than malathion at a rate of 10.4 ppm as a protectant on hard winter wheat against the confused flour beetle, Tribolium confusum Jacquelin duVal, and the red flour beetle, T. castaneum (Herbst), in a 12-month 0.14 m3 small bin storage study. Malathion degraded to 16.3% of the initial deposit during the 12-month period but pirimiphos methyl residue degraded more slowlyas 83.1%of the initial residue remained on the wheat at 12 months post-treatment. Toxicity studies showed that the residues of pirimiphos methyl on wheat were very effective against both species of Tribolium .
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