Information on the Goldspotted oak borer (GSOB)

Brief Summary Information on GSOB:

The goldspotted oak borer (GSOB), Agrilus coxalis Waterhouse, was first detected in 2004 in San Diego County California during an exotic woodborer survey.  In 2008 it was found in the same county attacking coast live oak, Quercus agrifolia, California black oak,  Q. keloggii and canyon live oak, Q. chrysolepis.  The area of infestation to date in southern California around the Cleveland National Forest.  These insects are aggressive and attack seemingly healthy trees.  The GSOB larvae feed under the bark primarily at the interface of the sapwood and phloem on the main stem and larger branches.  Larvae kill patches and strips of phloem and cambium, which result in limb and branch dieback and eventualy tree death.

Board of Forestry and Fire Protection Information:

A presentation on GSOB was presented to the Resource Protection Committee (RPC) on the status of the recently introduced invasive insect. The RPC requested that the CFPC advise the Board of Forestry & Fire Protection on possible actions that the Board could take to address this issue.

For more information on GSOB  and the memo and cover letter to the Board of Forestry by CFPC please see information below:

GSOB website:

California Firewood Website:

Don’t Move Firewood Website:

GSOB Signs/Symptoms Video:

GSOB ID Guide: GSOB Field Identification Guide

Tree Note 31: Goldspotted Oak Borer

CFPC and Board of Forestry & Fire Protection: Memo to Board of Forestry, Cover letter to the Board of Forestry

Adult beetle of GSOB

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