EFFECT OF FENVALERATE ON CONTROL OF EUROPEAN RED MITE (ACARI, TETRANYCHIDAE) ON PEACHES WITH ACARICIDES

The effect of fenvalerate on acaricidal control of European red mite, Panonychus ulmi (Koch), on peaches was evaluated. On control trees, two applications of fenvalerate resulted in a 3.3-fold increase in number of mite-days. In addition, the effectiveness of four of six acaricide treatments was reduced by treatment with fenvalerate, beginning almost-equal-to 50 d after treatment for cyhexatin and 88 d after treatment for clofentezine and hexythiazox. Because of late-season increase of mites in the acaricide plots treated with fenvalerate, counts of overwintering eggs increased by a factor of 6-31 times relative to comparable acaricide treatments not oversprayed with fenvalerate.