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1 June 2010 Toxicity and Sublethal Effects of Methoxyfenozide on Spodoptera exigua (Lepidoptera: Noctuidae)
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Abstract

The toxicity and sublethal effects of methoxyfenozide were evaluated in third instars of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), that fed on contaminated semisynthetic diet. The LC50 value was estimated at 0.23 mg of active ingredient (AI)/kg diet (range, 95% CI: 0.17–0.37) at 264 h after treatment. The effects on development, survival, and reproduction were observed in third instars of this pest that survived exposure to an LC25 concentration of methoxyfenozide. The larvae from the insecticide treatment exhibited lower pupal weights, an increase in both larval and pupal developmental times and a higher frequency of malformations of the wings in adults than untreated larvae. Adults from the methoxyfenozide treatment did not show reduced fecundity (mean cumulative number of eggs laid per female), but fertility as measured by the percentage of eggs hatched (fertility) was significantly reduced compared with untreated control insects. No significant effects were observed on pupal sex ratio. We concluded that the lethal and sublethal effects of methoxyfenozide are likely to have a significant impact on S. exigua populations on treated crops.

© 2010 Entomological Society of America
Christian-Luis Rodríguez Enríquez, Samuel Pineda, José I. Figueroa, Marcela-Inés Schneider, and Ana-Mabel Martínez "Toxicity and Sublethal Effects of Methoxyfenozide on Spodoptera exigua (Lepidoptera: Noctuidae)," Journal of Economic Entomology 103(3), (1 June 2010). https://doi.org/10.1603/EC09244
Received: 25 July 2009; Accepted: 1 December 2009; Published: 1 June 2010
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