WWETAC Projects

Project Title: Developing biological control methods for the goldspotted oak borer (GSOB), Agrilus coxalis (Coleoptera: Buprestidae)

Status: Ongoing

Principal Investigators and Affiliations: Steven J. Seybold, Pacific Southwest Research Station (PSW), Davis, CA; Mark Hoddle, University of California, Riverside, CA

Collaborators and Affiliations: Tom Coleman, Forest Health Protection (FHP), Region 5, San Bernardino, CA; Owen Martin, Cleveland National Forest, San Diego, CA; Joel McMillin, FHP, Region 3, Flagstaff, AZ; Robert LeFevre, Coronado National Forest, Tucson, AZ; Vanessa Lopez; UC Riverside, Department of Entomology

E-mail Contacts: Steve Seybold, sseybold[at]fs.fed.us; Mark Hoddle, mark.hoddle[at]ucr.edu

Key Issues/Problems Addressed: The goldspotted oak borer (GSOB) is currently the most devastating insect pest to attack native oaks in California (>17,000 trees killed since 2002 and this number is increasing as GSOB spreads). Infestation levels in areas with heavy tree mortality are now approaching 90%. Current management options are limited to preventive insecticide treatments for high-value trees and removal and sanitation of material from infested trees.  Biological control of GSOB with host-specific parasitoids has the potential to provide a long-term, widespread, low-cost, environmentally benign, and pest-specific management strategy. goldspotted oak borer

Learn How To Identify Goldspotted Oak Borer

Study Objectives and Goals: The objectives of this project are to: (1) conduct molecular analyses to establish the population origin of GSOB in California to help guide surveys for natural enemies for introduction into California; (2) assess the biological control potential of GSOB parasitoids in California with an initial emphasis on species reared from the Arizona population of GSOB, including a Calosota sp. (Hymenoptera: Eupelmidae) and another species (Hym: Braconidae) (identifications are pending for both); and (3) evaluate the biology/life history and conduct non-target impacts for promising GSOB parasitoids in the University of California Riverside, Insectary and Quarantine Facility.

Background Citations:

Hishinuma, S., Coleman, T. W., Flint, M. L., and Seybold, S. J.  2011.  Goldspotted oak borer:  Field identification guide, University of California Agriculture and Natural Resources, Statewide Integrated Pest Management Program, 6 pp., January 7, 2011, http://www.ipm.ucdavis.edu/EXOTIC/GSOBfieldguide.html

Coleman, T.W. and Seybold, S.J.  2010a.  Verification of a useful character for separating the sexes of the goldspotted oak borer, Agrilus coxalis auroguttatus (Coleoptera: Buprestidae).  Pan-Pacific Entomol. 86:58-62.

Coleman, T.W. and Seybold, S.J.  2010b.  GSOB ≠ SOD: Tree Mortality from the goldspotted
oak borer in oak woodlands of southern California.  pp. 58–63, in Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M., tech. cords. 2010. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTR-229, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 378 pp.

Seybold, S.J. and Coleman, T.W.  2010a.  The goldspotted oak borer:  An overview of a research
program for “California’s emerald ash borer.”  pp. xx―yy, in K. A. McManus and K. W. Gottschalk (eds.). Proceedings, 21st U.S. Department of Agriculture Interagency Research Forum on Gypsy Moth and Other Invasive Species 2010, January 12-15, 2010; Gen. Tech. Rep. NRS-P-xx. xxx pp., Newtown Square, Pennsylvania: USDA, Forest Service, Northern Research Station, December 2010.

Seybold, S.J. and Coleman, T.W.  2010b. Goldspotted oak borer:  A surprising primary mortality agent
on oaks in southern California, p. 374, in J.A. Parrotta and M.A. Carr (eds.). Forests for the Future:  Sustaining Society and the Environment.  XXIII IUFRO World Congress; August 23-28, 2010, Seoul, Republic of Korea.  The International Forestry Review 12(5): 374, 508 pp. Commonwealth Forestry Association, www.cfa-international.org. (Abstract).

Seybold, S.J., Coleman, T.W., and Flint, M.L.  2010.  Burn it, chip it, or tarp it, but just don’t
move it: Managing oak firewood infested with the goldspotted oak borer, Agrilus coxalis auroguttatus.  pp. 365–369, in Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M., tech. cords. 2010. Proceedings of the Sudden Oak Death Fourth Science Symposium. Gen. Tech. Rep. PSW-GTR-229, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 378 pp.

Seybold, S.J., Grulke, N.E., Graves, A.D., and Coleman, T.W.  2010.  Drought and forest insects: 
Interacting stressors on forest ecosystem health, p. 357, in J.A. Parrotta and M.A. Carr (eds.). Forests for the Future:  Sustaining Society and the Environment.  XXIII IUFRO World Congress; August 23-28, 2010, Seoul, Republic of Korea.  The International Forestry Review 12(5): 357, 508 pp. Commonwealth Forestry Association, www.cfa-international.org. (Abstract).

 

Coleman, T.W. and Seybold, S.J.  2009.  Striking gold in southern California:  Discovery of the goldspotted oak borer and its central role in oak mortality.  pp. 12-16, in K. A. McManus and K. W. Gottschalk (eds.). Proceedings, 20th U.S. Department of Agriculture Interagency Research Forum on Gypsy Moth and Other Invasive Species 2009, January 13-16, 2009; Gen. Tech. Rep. NRS-P-51. 114 pp., Newtown Square, Pennsylvania: USDA, Forest Service, Northern Research Station, December 2009.

Coleman, T.W. and Seybold, S.J. 2008a. New pest in California: The goldspotted oak borer, Agrilus coxalis Waterhouse. USDA Forest Service, Pacific Southwest Region, State and Private Forestry. Pest Alert R5-RP-022. October 18, 2008.

Coleman, T.W. and Seybold, S.J. 2008b. Previously unrecorded damage to oak, Quercus spp., in southern California by the goldspotted oak borer, Agrilus coxalis Waterhouse (Coleoptera: Buprestidae). Pan-Pacific Entomologist 84: 288-300.

Project ID: FY10TS73