Sublethal Effects of Two Insect Growth Regulators Applied to Larvae of Liriomyza trifolii (Diptera: Agromyzidae)

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Abstract
The sublethal effects of applications of the insect growth regulators (IGR) methoprene or Ro 13-5223 (ethyl[2-p-phenoxyphenoxy)ethyllcarbamate) to Liriomyza trifolii (Burgess) were calculated. Numbers of viable eggs laid every 2 days, total viable eggs per female, and longevity were determined for adults that survived IGR applications as larvae. A sterility index, indicative of decreases in fecundity, was calculated; with this index, a value of 100 represents complete infertility. Sterility index values of 88.8 to 100.0 were obtained when these IGR were applied to third-stage female larvae. When applied to newly eclosed female larvae, only the highest dosage of methoprene produced high sterility. No viable eggs were deposited by females that were confined with adult males surviving treatments of methoprene as larvae. The potential uses of IGR for leafminer control are discussed.

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