It is a native of Mexico and Guatemala and was first detected in Arizona in late 1800's. The freckled wing coverings each have two irregular black marks bordered in white. 2009). Figure 1 Location of research sites in southern California relative to the distribution of oak mortality documented annually by aerial sketch mapping (USDA Forest Service FHM, 2014) and modified from Coleman et al. In 2008, it was found in the same county attacking coast live oak, Quercus agrifolia, canyon live oak, Q. Its spread to California and its infestation of coast live oak, canyon live oak and California black oak has proved problematic and has resulted in extensive mortality of those species in San Diego County, California, USA (Smith 2009, Hespenheide et al. Distribution. An abundance of woodpeckers in your oak tree may also indicate the presence of borers. The insects attack coast live oak (Quercus agrifolia), California black oak (Quercus kelloggii), interior live oak (Quercus chrysolepis), and in rare cases Engelmann oak … Adult borers are usually 10mm in length and have bullet-shaped black bodies with gold spots on their sides. Goldspotted oak borer (Agrilus auroguttatus) is an insect pest of oak trees. First officially identified Gold Spotted Oak Borer infected tree–July, 2015 (Green Valley). The Goldspotted Oak Borer, Agrilus coxalis Waterhouse The goldspotted oak borer (GSOB) was first detected in 2004 in San Diego Co., California by the California Department of Food and Agriculture during a survey for exotic woodborers. (2012a). It was first detected in California in 2004 in San Diego County and has since contributed to the mortality of more than 80,000 oak trees over approximately 4,900 km 2. Goldspotted oak borer (GSOB) Agrilus auroguttatus is an invasive pest contributing to the on-going oak tree mortality occurring across San Diego, Riverside and Orange Counties. Goldspotted oak borer is a native insect found in Arizona. First discovered in San Diego in 2004 by the California Department of Food and Agriculture, the Goldspotted Oak Borer prey on drought-stricken trees with lowered immunity, where they begin to feed under the bark. GSOB, for short, this pesky little insect is a voracious and picky eater — only targeting oak trees. Although previously observed in Arizona, this borer beetle was not seen as a destructive pest until 2008 when it was associated with dieback affecting many oak trees in California. Host Range 2 Treat the oak tree with a soil- or stem-injection insecticide in early spring to kill larvae in the tree. The Goldspotted Oak Borer, or GSOB, is an invasive beetle that is killing native oaks in several areas of Southern California. Native to Guatemala, Southern Mexico, and the southeastern parts of Arizona, they have been plaguing San Diego County’s oak … The Goldspotted Oak Borer! The goldspotted oak borer is a buprestid beetle which is native to oak forests of southeastern Arizona, USA, where it has not been reported as a pest. Eggs for the Spotted Tree Borer are laid by females on a variety of weakened trees like oak… The white and black Spotted Tree Borer has complementary bands on its antennae. Larvae are white with two pincher-like Photo Courtesy of Cleveland National Forest. The Gold Spotted Oak Borer (Agrilus auroguttatus) is a flat-head borer which attacks native California oaks in San Diego counties. GOLDSPOTTED OAK BORER WHAT IS THE THREAT: The Goldspotted Oak Borer (Agrilus coxalis) is a flat-headed wood-borer that was originally found in San Diego, California in 2004. 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