Abstract
Twenty chemical treatments were tested for clover aphid ( Anuraphis bakeri (Cowen)) control in red clover raised for seed in eastern Washington. Considering aphid control, safety to pollinators, and safety to aphid predators and parasites, the best materials were Trithion® ( S-(p -chlorophenylthio) methyl O,O -diethyl phosphorodithioate), phosphamidon, phorate, and Methyl Trithion® ( S-(p -chlorophenylthio) methyl O,O -dimethyl phosphorodithioate) plus Trithion. Treatments must be applied about the fourth or fifth week after the hay cutting is taken to obtain maximum effectiveness. Aphid damage to seed production involves both reduction in weight of individual seeds and reduction in number of seeds produced.
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