ANALYSIS OF THE IMPACT OF ABAMECTIN ON LIRIOMYZA TRIFOLII (BURGESS) (DIPTERA: AGROMYZIDAE)

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Abstract
The effect of abamectin on the leafminer, Liromyza trifolii (Burgess), was investigated using topical applications, leaf dips, and repellency bioassays. Topical application of technical material in acetone to susceptible adult females provides an LD50 value of 0.404 ppm. Leaf-dip assays using abamectin formulated in water with third-instar larvae gave an LC50 value of 0.386 ppm. These data provide baseline information on the toxicity of this material to L. trifolii and are important in the development of resistance management programs. Adult female leaf miners were repelled from feeding and ovipositing on chrysanthemum plants treated with formulated abamectin up to 7 days after foliar application in choice and no-choice assays. The implications of these data in managing populations of L. trifolii are discussed.

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