Evaluation of Effectiveness of AC 303630 and Flucycloxuron Mixtures against Tetranychus urticae (Acari: Tetranychidae) under Laboratory and Field Conditions

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Abstract
The acaricidal activity of AC 3093630 [4-bromo-2-(4-chlorophenyl)-1-ethoxymethyl-5-trifluoromethyl pyrrole-3-carbonitrile] on the two-spotted spider mite (Tetranychus urticae KOGH) was evaluated in laboratory and field studies. In the laboratory, AC 303630 was highly effective against egg, immature, and adult stages at a concentration of 50 ppm. A mixture of flucycloxuron and bromopropylate was highly effective against egg and immature stages, whereas flucycloxuron+bifenthrin was toxic to immature stages only; these mixtures had little or no direct effect on adults. AD 303630 had no repellent activity, but flucycloxuron+bromopropylate revealed some repellency. In a field study of a population of T. urticae which showed resistance to dicofol, fenpyroximate, and pyridaben, efficacy of AC 303630 and flucycloxuron mixtures, evaluated at 20 d, was comparable to that of the widely used bromopropylate, axocyclotin or hexythiazox. No phytotoxicity was observed with these acaricides in 10-y-old 'Fuji' and 'Tsugaru' apple trees. The present studies indicate that AC 303630 and flucycloxuron mixtures can be used to prevent damage from T. urticae.