The residual effect of some products from Neem (Azadirachta indica A. Juss) seeds upon larvae ofBoarmia (Ascotis) selenaria Schiff. in laboratory trials |
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| Authors: | J Meisner M Wysoki K R S Ascher |
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| Institution: | 1. Div. of Toxicology, ARO, The Volcani Center, Bet Dagan
2. Div. of Entomology, ARO, The Volcani Center, Bet Dagan
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| Abstract: | The effect of Neem on the development ofBoarmia (Ascotis) selenaria Schiff. was investigated. Young leaves of avocado were treated in the laboratory with varying concentrations of Neem seed kernel suspensions or with emulsions of some Neem oil products, and offered to larvae of different size. Furthermore, avocado plants in flower pots were sprayed with Neem suspensions and the residues allowed to age in different locations. Leaves from the different treatments were offered to larvae of various sizes in laboratory tests and the larval weight, pupation rate and mortality were recorded. 0.3% Neem was highly effective on laboratory-treated leaves. A negative correlation was found between the concentration of the Neem suspensions on the one hand and the rate of growth and pupation on the other hand. No activity was found with the emulsion of either Neem extractive or Neem oil obtained from Neem kernels after extraction. In larvae kept for four days on avocado leaves treated with 0.3% Neem suspension, the growth and pupation rate was nearly as low as in larvae fed on treated leaves throughout their life span. The experiment with Neem-sprayed plants kept at different locations indicated the following order of activity of the residues: laboratory ? shade > sun. |
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