Residual Efficacy of Chlorpyrifos-methyl + Bioresmethrin and Chlorpyrifos-methyl + Resmethrin for Controlling Lesser Grain Borers (Coleoptera: Bostrichidae), Rice Weevils (Coleoptera: Curculionidae), and Red Flour Beetles (Coleoptera: Tenebrionidae) in Stored Wheat

1 April 1992

journal article
Published by Oxford University Press (OUP) in Journal of Economic Entomology

Vol. 85 (2) , 570-575
https://doi.org/10.1093/jee/85.2.570

Abstract

Soft red winter wheat was treated with chlorpyrifos-methyl alone or combined with either bioresmethrin or resmethrin (synergized and nonsynergized) and stored for 10 mo under ambient conditions in Savannah, Ga. Every 2 mo, wheat was removed from storage and bioassayed with adult lesser grain borers, Rhyzopertha dominica (F.); rice weevils, Sitophilus oryzae (L.); and red Rour beetles, Tribolium castaneum (Herbst). Mortality at 5 d, F₁ production, percentage damaged kernels, and dockage weight after 49 d of incubation were determined. Lesser grain borers never survived introduction on wheat treated with bioresmethrin, resmethrin, or either pyrethroid combined with chlorpyrifos-methyl. Rice weevils survived on wheat treated with the pyrethroids and caused considerable damage to the wheat. Both pyrethroids suppressed red flour beetle progeny. Chlorpyrifos-methyl alone or combined with bioresmethrin or resmethrin controlled all three species and protected the wheat for at least 8 mo.

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