, Volume 20, Issue 1, pp 15–23 | Cite as

Effect of Margosan-O on the development of the leafhopperasymmetrasca decedens

  • J. Meisner
  • M. Klein
  • E. Ben-moshe
Research Papers


The effect of Margosan-O, a formulation of a natural insecticide obtained from the neem (Azadirachta indica A. Juss) tree, on the development of the leafhopperAsymmetrasca decedens (Paoli), was investigated by testing insect performance (i) on cotyledons ofGossypium hirsutum cotton seedlings treated with different concentrations; (ii) on cotton seedlings stood with their petioles in different aqueous dilutions of Margosan-O and recording mortality until the adult stage; and (iii) determining the repellent effect on adults by recording their location on treatedvs untreated cotyledons in choice and no-choice situations. In foliar and in systemic treatments with 2% Margosan-O, practically none of the leafhoppers reached the adult stage. As the concentrations were lowered there was a gradual rise in the percentage of adults emerging; on untreated cotyledons 60-80% of the adults emerged. Feeding was zero or very low at high Margosan-O concentrations. Adult leafhoppers settled in significantly higher numbers on untreated than on treated cotyledons in both choice and no-choice experiments.

Key Words

Leafhoppers Asymmetrasca decedens neem Margosan-O systemic effect antifeedant IGR effect 


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Copyright information

© Springer Science + Business Media B.V. 1992

Authors and Affiliations

  • J. Meisner
    • 1
  • M. Klein
    • 1
  • E. Ben-moshe
    • 2
  1. 1.Dept. of EntomologyARO, The Volcani CenterBet DaganIsrael
  2. 2.Dept. of Plant IntroductionARO, The Volcani CenterBet DaganIsrael

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