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sterilant

International Journal of Tropical Insect Science (1)

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Conessine as a larval growth inhibitor, sterilant, and antifeedant from Holarrhena antidysenterica Wall
R. K. Thappa, K. Tikku, Bhaskar P. Saxena, R. M. Vaid, K. K. Bhutani
Journal:

Insect Science and Its Application / Volume 10 / Issue 2 / April 1989

Published online by Cambridge University Press:

19 September 2011, pp. 149-155

Print publication:

April 1989
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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.