| Title: | Trapping Failure Leads to Discovery of Potent Semiochemical Repellent for the Walnut Twig Beetle |
| Author(s): | Audley JP; Dallara PL; Nelson LJ; Hamud SM; Bostock RM; Seybold SJ; |
| Address: | "USDA Forest Service, Pacific Southwest Research Station, Davis, CA. Department of Entomology and Nematology, One Shields Avenue, University of California, Davis, CA. Department of Plant Pathology, One Shields Avenue, University of California, Davis, CA" |
| ISSN/ISBN: | 1938-291X (Electronic) 0022-0493 (Linking) |
| Abstract: | "The walnut twig beetle, Pityophthorus juglandis Blackman, and its associated fungal pathogen that causes thousand cankers disease, currently threaten the viability of walnut trees across much of North America. During a 2011 assessment of seasonal flight patterns of P. juglandis with yellow sticky traps baited with the male-produced aggregation pheromone component, 3-methyl-2-buten-1-ol, dramatically reduced catches were recorded when Tree Tanglefoot adhesive was used to coat the traps. In summer 2011, two trap adhesives were tested for potential repellency against P. juglandis in a field trapping bioassay. SuperQ extracts of volatiles from the most repellent adhesive were analyzed by gas chromatography-mass spectrometry, and limonene and alpha-pinene were identified as predominant components. In field-based, trapping experiments both enantiomers of limonene at a release rate of ~700 mg/d conferred 91-99% reduction in trap catches of P. juglandis to pheromone-baited traps. (+)- and (?ªª)-alpha-Pinene reduced trap catch by 40 and 53%, respectively, at the highest release rate tested. While a combination of R-(+)-limonene and (+)-alpha-pinene resulted in a 97% reduction in the number of P. juglandis caught, the combination did not consistently result in greater flight trap catch reduction than individual limonene enantiomers. The repellent effect of limonene may be valuable in the development of a semiochemical-based tool for management of P. juglandis and thousand cankers disease" |
| Keywords: | Animals *Coleoptera *Juglans Male North America Pheromones/pharmacology *Weevils limonene repellent thousand cankers disease trap adhesive alpha-pinene; |
| Notes: | "MedlineAudley, Jackson P Dallara, Paul L Nelson, Lori J Hamud, Shakeeb M Bostock, Richard M Seybold, Steven J eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2020/11/03 J Econ Entomol. 2020 Dec 9; 113(6):2772-2784. doi: 10.1093/jee/toaa257" |
