The effectiveness of imidacloprid as a treatment for control of the Russian wheat aphid, Diuraphis noxia (Mordvilko), on wheat, Triticum aestivum L, was variable. Planting time treatments were marginally effective in the fall. Russian wheat aphid densities in imidacloprid treatments were lower than in the untreated control at 6 and 12 wk after planting; however, control was inconsistent at 26 and 30 wk after planting. Aphid densities in the disulfoton and phorate treatments were variable at 6 and 12 wk after planting, and neither disulfoton or phorate provided good control against Russian wheat aphid at 26 or 30 wk after planting. The foliar treatment, chloropyrifos, reduced Russian wheat aphid densities in some locations, but not others. Imidacloprid was compatible with an experimental Russian wheat aphid resistant cultivar, ‘RWA E1’ Russian wheat aphid densities were lower in imidacloprid treatments than in the untreated control at all rates tested for both the susceptible variety and resistant variety. Under the low infestations observed, yield benefits with the use of imidacloprid were minimal. Yields in treated plots were similar to yields in the untreated control. No phytotoxicity or negative effects on yield were observed with any imidacloprid treatment.
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Imidacloprid Seed Treatments for Control of Russian Wheat Aphid (Homoptera: Aphididae) on Winter Wheat
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