Coast Live Oak, Quercus Agrifolia, Susceptibility and Response to Goldspotted Oak Borer, Agrilus Auroguttatus, Injury in Southern California
G Model FORECO-12550; No. of Pages 14 ARTICLE IN PRESS Forest Ecology and Management xxx (2011) xxx–xxx Contents lists available at ScienceDirect Forest Ecology and Management journal homepage: www.elsevier.com/locate/foreco Coast live oak, Quercus agrifolia, susceptibility and response to goldspotted oak borer, Agrilus auroguttatus, injury in southern California Tom W. Coleman a,∗, Nancy E. Grulke b,1, Miles Daly c, Cesar Godinez b, Susan L. Schilling b, Philip J. Riggan b, Steven J. Seybold d a USDA Forest Service, Forest Health Protection, 602 S. Tippecanoe Ave., San Bernardino, CA 92408, USA b USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA 92507, USA c 1927 Goss St., Boulder, CO 80302, USA d Chemical Ecology of Forest Insects, USDA Forest Service, Pacific Southwest Research Station, 720 Olive Drive, Suite D, Davis, CA 95616, USA article info abstract Article history: Oak mortality is often associated with a complex of decline factors. We describe the morphological and Received 11 November 2010 physiological responses of coast live oak, Quercus agrifolia Née, in California to an invasive insect, the Received in revised form 6 February 2011 goldspotted oak borer (GSOB), Agrilus auroguttatus Schaeffer (Coleoptera: Buprestidae), and evaluate Accepted 7 February 2011 drought as a potential inciting factor. Morphological traits of 356 trees were assessed and physiological Available online xxx traits of 70 of these were monitored intensively over one growing season. Morphological characteristics of tree health included crown thinning and dieback; bole staining resulting from larval feeding; den- Keywords: sity of GSOB adult exit holes; and holes caused by woodpecker feeding.
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