Insecticidal Response of Currant Borer and Two-Spotted Spider Mite on Currants in Central Washington1

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Abstract
Twelve insecticides in combination with Volck Supreme oil® were tested as ovicides for control of the currant borer, Ramosia tipuliormis w(Clerck), on Red Lake and Wilder varieties of currants in 1963. The 3 most effective—parathion, Bay 25141 (O,O-diethyl O-[P-(methylsulfinyl)-phenyl] phosphorothioate), and trichlorfon—were further evaluated without oil in replicated plots in 1964. Parathion was most effective and gave 44.1-78.8% control. Three applications of mevinphos for control of adult currant borers in 1962 were ineffective. During a 3-year period Wilde sustained about twice as much currant borer population as the variety Red Lake. No parasites of the currant borer were recovered. Two-spotted spider mites, Tetranychus urticae (Koch), resistant to dicofol were reduced in number with carbophenothion. Aramite® (2-(peter-bulylphenoxy)isotropyl-2-chloroephyl sulfite) at 2.24 kg actual per hectare (2.0 lb actual per acre) was the most effective of 4 acaricides tested in 1964. Phytoseiid mites, predators of the two-spotted spider mite, were present at a uniformly low density. Most predaceous mites survived the use of carbophenothion on Red Lake currants in 1961.

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