Evaluations of Selected Insecticides for Control of Permethrin-Resistant Liriomyza trifolii (Diptera: Agromyzidae) on Chrysanthemum

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Abstract
Several rates of the insecticides CGA 72662 O.4E, pyrazophos 2.5E, MK 936 0.03E (Avermectin B1), and SD 52618 85W were applied to chrysanthemum plants containing permethrin-susceptible, newly eclosed or third-stage larvae of Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) in the laboratory to determine comparative toxicity under controlled conditions. All materials and rates except the lowest rate of SD 52618 (12.0 g of AI/100 liters of water) provided better than 85% control of larvae within leaves. Field phytotoxicity trials revealed that CGA 72662 was the only insecticide which was phytotoxic after repeated applications to chrysanthemum. Field efficacy trials with flies showing ca. 30-fold resistance to permethrin demonstrated that, when completed number of mines per plant are compared, the order of decreasing efficacy was MK 936, pyrazophos, and SD 52618. A standard insecticide combination included in this field evaluation, microencapsulated methyl parathion 2E plus permethrin 2E, failed to produce a marketable chrysanthemum crop.