Inhibition of oviposition by volatiles of certain plants and chemicals in the leafhopperAmrasca devastons (distant) |
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Authors: | K N Saxena A Basit |
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Affiliation: | (1) Department of Zoology, Delhi University, 110 007 Delhi, India |
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Abstract: | Oviposition by the leafhopperAmrasca devastans (Distant) on its susceptible host plant, cotton (Gossypium hirsutum var. PS-10), was inhibited by the volatiles of certain plants and by the vapors of some chemicals occurring in various plants when these were presented at a distance from the ovipositional substrate. The effectiveness of the volatiles of the plants for inhibiting the oviposition decreased in the order: eucalyptus > coriander=castor=tomato > lime,Ocimum being without effect. Among the volatile plant chemicals tested, the inhibitory effects decreased in the order: citral=carvacrol > citronellol=farnesol = geraniol=eucalyptus oil > neem oil=Cymbopogan oil. These chemicals served as volatile antiovipositants and did not reduce the arrival/stay of the insects on the host plants. Carvacrol had a slight toxic effect on the nymphs, but none of the volatiles was toxic to the adults.Homoptera: Cicadellidae. |
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Keywords: | Volatile ovipositional inhibitors citral citronellol farnesol geraniol plant/chemical volatiles leafhopper Amrasca devastans Homoptera Cicadellidae Gossypium hirsutum |
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