Toxicity of the limonoid allelochemical cedrelone to noctuid larvae

Tipo de material: Texto

TextoSeries ; Entomologia Experimentalis et Applicata, 64(3), p.281-287, 1992Trabajos contenidos:

Koul, O
Isman, M.B

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Resumen: The limonoid cedrelone, a constituent of Cedrela toona and C. odorata (Meliaceae)was evaluated as a larval growth inhibitor for the polyphagous noctuids Peridroma saucia and Mamestra configurata by examining its effects on development and feeding behaviour. Cedrelone significantly inhibited growth of different larval instars when administered orally (in artificial diet), topically or via injection. Nutritional analyses revealed that both growth inhibition and reduced consumption are a consequence of post-ingestive malaise rather than a peripherally-mediated antifeedant effect. Cedrelone administered via injection to sixth instar P. saucia larvae also inhibited growth, delayed development, and resulted in considerable larval mortality. However, all larvae which survived treatment pupated successfully. The present study suggests that the toxicity of cedrelone does not likely involve the endocrine system.

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The limonoid cedrelone, a constituent of Cedrela toona and C. odorata (Meliaceae)was evaluated as a larval growth inhibitor for the polyphagous noctuids Peridroma saucia and Mamestra configurata by examining its effects on development and feeding behaviour. Cedrelone significantly inhibited growth of different larval instars when administered orally (in artificial diet), topically or via injection. Nutritional analyses revealed that both growth inhibition and reduced consumption are a consequence of post-ingestive malaise rather than a peripherally-mediated antifeedant effect. Cedrelone administered via injection to sixth instar P. saucia larvae also inhibited growth, delayed development, and resulted in considerable larval mortality. However, all larvae which survived treatment pupated successfully. The present study suggests that the toxicity of cedrelone does not likely involve the endocrine system.

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