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Pirimiphos Methyl as a Short Term Protectant of Grain Against Stored-Product Insects

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Pirimiphos methyl (O-[2-(diethylamino)-6-methyl-4- pyrimidinyl] O,O-dimethyl phosphorothioate), applied as a water emulsion (5, 10, and 20 ppm) to hard winter wheat and shelled yellow corn killed all exposed adult rice weevils, Sitophilus oryzae (L.) , red flour beetles, Tribolium castaneum (Herbst), confused flour beetles, T. confusum Jacquelin duVal, and lesser grain borers, Rhyzopertha dominica (F.) at 24 h and 1 month after treatment; no F1 progeny developed. After 3 months, a few red and confused flour beetles survived exposure to grain treated with 5 ppm, but no progeny developed. Also, some lesser grain borers survived, and F1 progeny and damage were recorded in wheat treated with 5 ppm and in corn treated with 5 and 10 ppm. Malathion, applied at a calculated dosage of 10 ppm as the chemical standard, gave complete protection to both grains for 3 months.

The residues of pirimiphos methyl degraded gradually as the storage period lengthened except for the 20 ppm applied to shelled corn. The residues of malathion de-graded gradually on both grains.

Document Type: Research Article

Publication date: April 1, 1975

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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