Title: Goldspotted oak borer effects on tree health and colonization patterns at six newly-established sites
Author: Haavik, Laurel J.; Flint, Mary L.; Coleman, Tom W.; Venette, Robert C.; Seybold, Steven J.;
Source: Agricultural and Forest Entomology 17(2): 146-157.
Publication Series: Scientific Journal (JRNL)
Description: Newly-established populations of invasive wood-inhabiting insects provide an opportunity for the study of invasion dynamics and for collecting information to improve management options for these cryptic species. From 2011 to 2013, we studied the dynamics of the goldspotted oak borer Agrilus auroguttatus Schaeffer (Coleoptera: Buprestidae), a new pest of oaks in southern California, at six sites that had been colonized recently. At all sites, the percentage of coast live oaks Quercus agrifolia Nee, colonized by A. auroguttatus increased between 2011 (6-33%) and 2013 (23-40%), although beetle densities did not grow rapidly at most sites. From 2011 to 2013, there were minor changes in signs and symptoms of A. auroguttatus infestation (adult emergence holes, bark staining, and evidence of woodpecker foraging), except at one site where an outbreak occurred. At some sites, noticeable negative changes in oak crown health occurred 1 year prior to positive A. auroguttatus population growth. Among sites, most of the A. auroguttatus population density (66-93%) was produced by a small number of heavily-infested trees (= brood trees). Early identification and removal of brood trees in newly-invaded areas could slow the growth of A. auroguttatus populations.
Keywords: Agrilus auroguttatus, brood trees, insect population dynamics, invasion dynamics, newly-established invasive species, oak pest, per capita rate of increase
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
XML: View XML
Haavik, Laurel J.; Flint, Mary L.; Coleman, Tom W.; Venette, Robert C.; Seybold, Steven J. 2015. Goldspotted oak borer effects on tree health and colonization patterns at six newly-established sites. Agricultural and Forest Entomology 17(2): 146-157.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility