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Title: Developing Monitoring Techniques for the Invasive Goldspotted Oak Borer (Coleoptera: Buprestidae) in California

Author: Coleman, Tom W.; Chen, Yigen.; Graves, Andrew D.; Hishinuma, Stacy M.; Grulke, Nancy E.; Flint, Mary Louise.; Seybold, Steven J

Date: 2014

Source: Environmental Entomology

Publication Series: Scientific Journal (JRNL)

Description: The goldspotted oak borer, Agrilus auroguttatus Schaeffer (Coleoptera: Buprestidae), is an invasive species that has colonized oak woodlands in southern California. To better define its seasonal flight activity, assist with forest and integrated pest management activities, and define the current distribution in California, an effective monitoring technique for A. auroguttatus is necessary. We assessed the efficacy of two colors of flight-intercept prism traps, the placement of these traps at three heights, and several commercially available lures [Manuka oil, Phoebe oil, and a green leaf volatile, (3Z)-hexenol] for monitoring the ßight of adult A. auroguttatus. Landing rates and the densities of D-shaped emergence holes of A. auroguttatus adults were assessed on the lower stems of coast live oak, Quercus agrifolia Ne´e, of varying size and crown health classes. Purple flight-intercept prism traps placed at heights of 3 m and 4.5 m caught signiÞcantly more female A. auroguttatus than green prism traps. In one experiment, males also responded at a significantly higher level to purple than to green prism traps placed at 3 m height. The addition of commercially available lures significantly enhanced male, but not female, A. auroguttatus trap catch when compared with unbaited control traps. There were no differences among male flight responses to the three lures. A. auroguttatus landing rates and emergence hole densities were significantly greater on the largest-diameter trees (76.2 cm diameter at breast height) and on trees with severe crown thinning or complete crown collapse. The annual increment in emergence hole densities was also significantly greater on trees with severe crown thinning or complete crown collapse. In three trapping studies over multiple years in southern California, the adult ßight period began as early as mid-May, peaked in mid-June to early July, and ended in early- to mid-September. To demonstrate the efÞcacy of the detection method for A. auroguttatus (unbaited purple traps at 3mheight), a delimitation survey conducted from 2009 to 2012 confirmed that the species was only present in San Diego Co., but that the distribution was expanding northward.

Keywords: Agrilus auroguttatus, flight-intercept prism trap, oak mortality, phloem/wood borer, semiochemical

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Coleman,Tom W.; Chen, Yigen.; Graves, Andrew D.; Hishinuma,Stacy M.; Grulke, Nancy E.; Flint, Mary Louise.; and Seybold, Steven J 2014. Developing Monitoring Techniques for the Invasive Goldspotted Oak Borer (Coleoptera: Buprestidae) in California. Environ. Entomol. 43(3): 729-743

 


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