Three strains of almond moth were collected in 1975 from stored foodstuffs and mill products in New South Wales and their responses to 23 insecticides were compared with a laboratory reference strain. The strains showed 35-, 57-, and 62-fold resistance to endrin and >49- and >52-fold to dieldrin and DDT, respectively. Two strains displayed >259-fold resistance to malathion. These strains also showed low order resisitance (≪15-fold) to other organophosphorus insecticides, including diazinon, pirimiphos-methyl, and fenitrothion. None of the strains was resistant to pyrethrum extract, synthetic pyrethroids or the carbamate, methomyl.
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F. I. Attia (1976) studied this question.