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« Previous AbstractWalnut Twig Beetle (Coleoptera: Curculionidae: Scolytinae) Colonization of Eastern Black Walnut Nursery Trees    Next AbstractTrapping Failure Leads to Discovery of Potent Semiochemical Repellent for the Walnut Twig Beetle »

J Chem Ecol


Title:"Trap Assays of the Walnut Twig Beetle, Pityophthorus juglandis Blackman (Coleoptera: Curculionidae: Scolytinae), Reveal an Effective Semiochemical Repellent Combination"
Author(s):Audley JP; Bostock RM; Seybold SJ;
Address:"USDA Forest Service, Pacific Southwest Research Station, Davis, CA, 95618, USA. Jackson.audley@usda.gov. Department of Plant Pathology, University of California, Davis, CA, 95616, USA. USDA Forest Service, Pacific Southwest Research Station, Davis, CA, 95618, USA"
Journal Title:J Chem Ecol
Year:2020
Volume:20201027
Issue:11-Dec
Page Number:1047 - 1058
DOI: 10.1007/s10886-020-01228-9
ISSN/ISBN:1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:"Thousand cankers disease (TCD), is an invasive insect-disease complex caused by the walnut twig beetle, Pityophthorus juglandis, and fungal pathogen, Geosmithia morbida. Semiochemical interruption is a viable option for protecting walnut trees from P. juglandis attack. The goal of this study was to test beetle responses to potential repellent compounds. The results of five, flight-intercept assays are reported. Assays 1-3 tested four compounds at variable release rates: (S)-(-)-verbenone, (R)-(+)-verbenone, racemic chalcogran, and racemic trans-conophthorin. Trapping results indicated that the highest release rate tested for each compound was the most effective in reducing the number of beetles caught. (S)-(-)-Verbenone was the least effective, reducing P. juglandis trap catches by 66%. (R)-(+)-Verbenone reduced the number of P. juglandis by 84%. Neither enantiomer of verbenone performed as well as chalcogran or trans-conophthorin, which both reduced the number of beetles caught by ca. 98%. Following individual assays, the most effective compounds were tested in subtractive-combination assays. Combinations of high release rates for (R)-(+)-verbenone, trans-conophthorin, and two stereoisomers of limonene (tested in a previous study) were tested in two assays. The subtractive-combination assays were inconclusive in that trap catches were similar across all treatments. All combination treatments were highly effective, achieving approximately 99% reduction in the number of beetles caught. Based on the trapping results, commercial availability, and cost of the semiochemicals tested, we conclude that a combination of (R)-(+)-limonene, trans-conophthorin, and (R)-(+)-verbenone constitutes an effective tool for reducing P. juglandis trap catches"
Keywords:Animals Bicyclic Monoterpenes/chemistry/metabolism Female Hypocreales/*physiology Insect Repellents/metabolism Isomerism Juglans/*chemistry Limonene/metabolism Male Pheromones/*metabolism Plant Diseases/prevention & control Spiro Compounds/chemistry/metab;
Notes:"MedlineAudley, Jackson P Bostock, Richard M Seybold, Steven J eng 16-SCBGP-CA-0035/Agricultural Marketing Service/ 2020/10/28 J Chem Ecol. 2020 Dec; 46(11-12):1047-1058. doi: 10.1007/s10886-020-01228-9. Epub 2020 Oct 27"

 
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Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
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