title: Inhibition of oviposition by volatiles of certain plants and chemicals in the leafhopperAmrasca devastons (distant).
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.
authors.affiliation: Department of Zoology, Delhi University, 110 007, Delhi, India.
authors.forename: K N
authors.initials: KN
authors.lastname: Saxena
authors.forename: A
authors.initials: A
authors.lastname: Basit