Insecticide Resistance in Selected Stored-Product Insects Infesting Peanuts in the Southeastern United States1

Abstract

Field strains of the Indian meal moth, Plodia interpunctella, the almond moth, Ephestia cautella, and the red flour beetle, Tribolium castaneum, collected from peanut and oilseed storage facilities throughout the Southeastern United States, were tested for susceptibility to malathion [121-75-5], dichlorvos [62-73-7], and pirimiphos-methyl (Actellic) [29232-93-7]. Probit-mortality regression lines indicate that malathion resistance is both widespread and severe, but no dichlorvos resistance was detected in any strain tested. No significant cross-resistance to pirimiphos-Me was evident, although flat slopes for the dosage-mortality regression lines for several P. interpunctella strains indicated a potential for the development of resistance to this insecticide. [on SciFinder(R)]