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      Impact of pymetrozine on glassy-winged sharpshooter feeding behavior and rate of Xylella fastidiosa transmission

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          Abstract

          Pymetrozine is a compound that interferes with insect feeding and interrupts transmission of plant pathogens. The glassy-winged sharpshooter, Homalodisca coagulata Say (Hemiptera, Cicadellidae), is a vector of Xylella fastidiosa, the foregut-borne, propagative bacterium that causes Pierce's disease of grapevine. In this study, we recorded the behavioral response of H. coagulata to plants treated by soil drench with pymetrozine using time-lapse photography, quantified the reduction in liquid excreta produced by H. coagulata fed on pymetrozine-treated plants, and evaluated pymetrozine effectiveness in reducing transmission rate in grapevines. H. coagulata feeding on plants treated with 0.015 mg of pymetrozine was disrupted by decreasing the number of contacts made with the grapevine by more than 50% and by increasing movements away from the stem by more than 5-fold. Excreta production by H. coagulata was significantly reduced on plants treated with 0.015 or 0.0075 mg of pymetrozine. Contrary to the expected outcome, the mean number of X. fastidiosa-infected plants actually increased in the pymetrozine treatments relative to the controls.

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          Evidence for Noncirculative Transmission of Pierce's Disease Bacterium by Sharpshooter Leafhoppers

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            Feeding by the leafhopper, Homalodisca coagulata, in relation to xylem fluid chemistry and tension

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              Proximity to citrus influences Pierce's disease in Temecula Valley vineyards

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                Author and article information

                Journal
                J Insect Sci
                Journal of Insect Science
                University of Arizona Library
                1536-2442
                2004
                22 October 2004
                : 4
                : 34
                Affiliations
                [1 ]University of California, Riverside; Department of Entomology; Riverside, California 92521, USA
                [2 ] blake.bextine@ 123456ucr.edu
                Article
                1081570
                15861249
                f645a019-49e2-4406-b309-1881c1b3c9f0
                Copyright © 2004. Open access; copyright is maintained by the authors.
                History
                : 4 April 2004
                : 30 July 2004
                Categories
                Articles

                Entomology
                transmission,vector,homalodisca coagulata,xylem,pierce's disease
                Entomology
                transmission, vector, homalodisca coagulata, xylem, pierce's disease

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