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Effects of malathion dust on indian meal moth plodia interpunctella and almond moth ephestia cautella lepidoptera phycitidae infestation of stored wheat



Effects of malathion dust on indian meal moth plodia interpunctella and almond moth ephestia cautella lepidoptera phycitidae infestation of stored wheat



Journal of Economic Entomology 76(6): 1401-1404



Glass bottles containing 100 g of wheat which was insecticide free or was treated with malathion (formulated as a dust) at 1, 2 or 8 ppm were infested with 20 eggs of P. interpunctella or E. cautella. After 2 wk of storage at 27.degree. C, an additional 20 moth eggs were introduced into the bottles of wheat treated with malathion at 2 and 8 ppm, since the original young larvae were killed. Insect numbers and grain quality were determined at 2, 4, 6 and 8 wk in storage. Both P. interpunctella and E. cautella developed and multiplied in the insecticide-free wheat. The initial dose of malathion at 1 ppm effectively controlled P. interpunctella; no larvae developed into adults. A few E. cautella survived, and a mean of 1 adult/bottle was observed at 8 wk of storage. Since insecticide degradation had occurred, both species of moths developed successfully when wheat which initially contained malathion at 2 ppm was reinfested after 2 wk of storage. Larval mortality of both species was high. For both species, none of the original larvae or those developing from eggs added after 2 wk survived with malathion at 8 ppm. A 1-ppm dose of malathion dust controlled P. interpunctella larvae, but levels > 2 ppm were needed to control E. cautella. The moisture content of the grain, which fluctuated between 15 and 18%, was not affected by the insect populations. Seed damage caused by insect feeding, seed germination and seed-borne microflora was largely related to insect numbers in the various treatments.

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Effects of Malathion Dust on Indian Meal Moth and Almond Moth (Lepidoptera: Phycitidae) Infestation of Stored Wheat. Journal of Economic Entomology 76(6): 1401-1404, 1983

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