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1 August 2006 Toxicity and Pharmacokinetics of Spinosad and Methoxyfenozide to Spodoptera littoralis (Lepidoptera: Noctuidae)
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Abstract

The toxicity of spinosad and methoxyfenozide against neonates and fourth instars of Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) was tested under laboratory conditions. According to LC50 values, no significant differences were observed between spinosad (0.50 mg [AI]/kg diet) and methoxyfenozide (0.54 mg [AI] /kg diet) after 48 h of ingestion treatment on neonate larvae, based on the overlap of 95% CL. Similarly, on fourth instars, no significant differences were observed between LC50 (2.98 and 5.17 mg [AI]/kg diet for spinosad and methoxyfenozide, respectively, at 96 h after ingestion of artificial diet) and LD50 (4.74 and 2.68 μg [AI]/g larva for spinosad and methoxyfenozide, respectively, at 144 h after topical application). In addition, spinosad and methoxyfenozide significantly suppressed weight gain of neonates and fourth instars continuously fed with artificial diet containing the insecticides. The second part of this project was focused on the effects of methoxyfenozide on the reproduction of S. littoralis by determining the effect on oviposition in three different crosses and the pharmacokinetics pattern of (14C)-methoxyfenozide in the body tissues of female and male adults after topical application in their excrement and in the deposited eggs to test transport through the female and the male adult. Methoxyfenozide negatively affected the reproduction of adults regardless the treated sex, presumably because of its presence in the adult body, accumulation in the laid eggs, and slow excretion of the product. We conclude that spinosad and methoxyfenozide represent an important choice to be used in integrated pest management where S. littoralis is a major pest.

Samuel Pineda, Guy Smagghe, Marcela Inés Schneider, Pedro Del Estal, Elisa Viñuela, Ana Mabel Martínez, and Flor Budia "Toxicity and Pharmacokinetics of Spinosad and Methoxyfenozide to Spodoptera littoralis (Lepidoptera: Noctuidae)," Environmental Entomology 35(4), (1 August 2006). https://doi.org/10.1603/0046-225X-35.4.856
Received: 25 November 2005; Accepted: 1 May 2006; Published: 1 August 2006
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