Abstract
The toxicity of insecticides was established for populations of Myzus persicae (Sulzer) collected from peppers in the autumn of most years from 1971 to 1980. Laboratory tests proved that green peach aphids were resistant to malathion in 1971, and resistance to three other insecticides was suspected. By 1980, resistance was recorded for 13 materials, and cross-resistance was suspected for three newer insecticides. LD95 values for susceptible aphids varied over a 4-fold range through the years. Field tests with contact sprays or systemic granular treatments indicated that the best control was achieved in recent years with acephate, methamidophos, profenofos, phorate, and aldicarb.
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