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Conessine as a larval growth inhibitor, sterilant, and antifeedant from Holarrhena antidysenterica Wall
Published online by Cambridge University Press: 19 September 2011
Abstract
Conessine, the steroidal alkaloid of Holarrhena antidysenterica Wall, possesses a wide range of activities against four insect species viz. Aedes aegypti, Dysdercus koenigii, Spodoptera litura and Pieris brassicae. In D. koenigii the compound inhibits the egg hatching of treated adults and nymphs. In Ae. aegypti the larval developmental periods are extended, resulting in a high mortality rate. Such effects are produced at very low dosages of 0.5 to lOppm. Antifeedant activity is observed against larvae of S. litura and P. brassicae at concentrations of 0.005 to 0.2 % of conessine.
Résumé
La conessine, un alkaloide steroidique du Holarrhena antidysenterica Wall, possède des activités importantes contre quatre espèces d'insectes Aedes aegypti, Dysdercus koenigii, Spodoptera litura et Pieris brassicae. Dans D. koenigii la substance bloque le developpment des oeufs des adultes et chrysalides, ceci peut entrainer une mortalité très elevée. Des effets de ce genres sont produits par des doses minimes de 0,5 a 10 ppm. Une activite repulsive a èté observée a une concentration de 0,005 a 0,2% de conessine contre les larves du S. litura et P. brassicae.
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