Sublethal Effects of Indoxacarb

Liu et al. (2002) observed numerous effects of indoxacarb on the development of cabbage looper (Trichoplusia ni) larvae feeding on field-aged leaf residues 18-20 days old as well as on subsequent pupae and emerging adults. These effects were also documented on heliothine and Spodoptera species fed on diet with indoxacarb at 0.1 and 0.01 ppm (Andaloro, unpublished data). Larval development was greatly extended compared to the untreated check; survivors pupated 1-2 weeks later. Treated larvae were much smaller than untreated larvae. Some larvae could not molt or pupate properly, with exuvia remaining attached and sometimes severely restricting the body. Treated lepidopteran larvae and Colorado potato beetle (Leptinotarsa decemlineata) larvae sometimes are unable to dig into the soil and thus pupate on top of the soil. In the laboratory, lepidopteran adults emerging from treated larvae often have abnormal wings or are unable to fly. Liriomyza adults whose larvae were exposed to leaves treated with sublethal doses of indoxacarb emerged disoriented, stumbling, and unable to fly (Leibee, unpublished data). There are sufficient data indicating indoxacarb has significant growth regulating effects on the larvae, pupae, and adults of pest insect species observed which contribute to overall suppression of the field population.

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