Toxicity of Four Organophosphorus Insecticides to a Malathion-Resistant Strain of the Indian Meal Moth in North Carolina123

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Abstract
A field-collected and a laboratory strain of Plodia interpunctella (Hübner) were treated in the laboratory with malathion and four other organophosphorus compounds. Studies revealed that the field strain of P. interpunctella was >227-fold resistant to malathion. Since most resistance was suppressed by the synergistic action of triphenyl phosphate, the carboxyesterase appears to play a major role in the detoxification mechanism of malathion in this strain. The malathion-resistant strain showed a low level of tolerance to the other four organophosphorus compounds. Tolerance levels to these compounds were: pirimiphos methyl × 1.9; fenitrothion × 1.6; bromophos × 1.3; CGA-20168 (transphosphorothioic acid O, O-dimethyl 0-(2-methoxycarbonyl-2-methylvinyl-ester) × 1.5.

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