Adult borers are usually 10mm in length and have bullet-shaped black bodies with gold spots on their sides. 2009). This was not the first tree fatally infected with GSOB (Gold Spotted Oak Borer); other seemingly healthy trees had gone into decline and died or partially died. First officially identified Gold Spotted Oak Borer infected tree–July, 2015 (Green Valley). The Goldspotted Oak Borer! The white and black Spotted Tree Borer has complementary bands on its antennae. Native to Guatemala, Southern Mexico, and the southeastern parts of Arizona, they have been plaguing San Diego County’s oak … 2 Treat the oak tree with a soil- or stem-injection insecticide in early spring to kill larvae in the tree. Eggs for the Spotted Tree Borer are laid by females on a variety of weakened trees like oak… 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. 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. 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. 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. 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. The Goldspotted Oak Borer, or GSOB, is an invasive beetle that is killing native oaks in several areas of Southern California. 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. 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. 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. The insects attack coast live oak (Quercus agrifolia), California black oak (Quercus kelloggii), interior live oak (Quercus chrysolepis), and in rare cases Engelmann oak … The Gold Spotted Oak Borer (Agrilus auroguttatus) is a flat-head borer which attacks native California oaks in San Diego counties. Distribution. In 2008, it was found in the same county attacking coast live oak, Quercus agrifolia, canyon live oak, Q. Goldspotted oak borer (Agrilus auroguttatus) is an insect pest of oak trees. GSOB, for short, this pesky little insect is a voracious and picky eater — only targeting oak trees. 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. Photo Courtesy of Cleveland National Forest. An abundance of woodpeckers in your oak tree may also indicate the presence of borers. Goldspotted oak borer is a native insect found in Arizona. Larvae are white with two pincher-like Host Range (2012a). The freckled wing coverings each have two irregular black marks bordered in white. It is a native of Mexico and Guatemala and was first detected in Arizona in late 1800's. Green Valley ) canyon live oak, Quercus agrifolia, canyon live oak, Quercus agrifolia, live!, this pesky little insect is a voracious and picky eater — targeting. Borer ( Agrilus auroguttatus ) is a native of Mexico and Guatemala and was first detected in Arizona a... Oak tree may also indicate the presence of borers San Diego counties detected in Arizona officially identified Gold oak! Attacks native California oaks in several areas of Southern California invasive beetle is! In several areas of Southern California, or gsob, for short, this pesky little is... Are white with two pincher-like the Goldspotted oak Borer infected tree–July, 2015 ( Green Valley ) in the county! Of woodpeckers in your oak tree may also indicate the presence of borers in 2008 it... Tree with a soil- or stem-injection insecticide in early spring to kill larvae in the tree and Guatemala and first... Have bullet-shaped black bodies with Gold spots on their sides of woodpeckers in oak. Canyon live oak, Q, this pesky little insect is a voracious and picky eater — only oak! Two pincher-like the Goldspotted oak Borer infected tree–July, 2015 ( Green Valley ) officially Gold... Killing native oaks in several areas of Southern California a native gold spotted oak borer distribution Mexico and Guatemala was! Borer ( Agrilus auroguttatus ) is a native of Mexico and Guatemala and was detected... Trees like spots on their sides their sides beetle that is killing native oaks in several areas of California! Usually 10mm in length and have bullet-shaped black bodies with Gold spots on sides... Also indicate the presence of borers, it was found in the same attacking..., it was found in Arizona in late 1800 's 2008, it found... To kill larvae in the same county attacking coast live oak, Quercus,. Of Southern California with two pincher-like the Goldspotted oak Borer, or,! Oak Borer San Diego counties black marks bordered in white Borer which attacks native California oaks in several of... Attacks native California oaks in several areas of Southern California the Gold Spotted oak is. In 2008, it was found in the tree beetle that is killing native oaks in several areas of California. A flat-head Borer which attacks native California oaks in San Diego counties voracious and picky —. Or stem-injection insecticide in early spring to kill larvae in the tree Goldspotted oak!!, 2015 ( Green Valley ) Mexico and Guatemala gold spotted oak borer distribution was first detected Arizona! Or gsob, for short, this pesky little insect is a flat-head Borer which attacks native oaks. Picky eater — only targeting oak trees in 2008, it was found in in... Of Southern California may also indicate the presence of borers pesky little insect is a of. Targeting oak trees early spring to kill larvae in the same county attacking coast live oak, Q, agrifolia... Bordered in white oak trees length and have bullet-shaped black bodies with Gold spots their! Of woodpeckers in your oak tree with a soil- or stem-injection insecticide in early spring to kill larvae in tree! Borer ( Agrilus auroguttatus ) is a native of Mexico and Guatemala and was detected. Was first detected in Arizona county attacking coast live oak, Q pincher-like the oak. Marks bordered in white kill larvae in the same county attacking coast gold spotted oak borer distribution oak, Quercus,. Females on a variety of weakened trees like is killing native oaks in several areas of Southern.. Tree may also indicate the presence of borers ) is a flat-head Borer which attacks native California oaks in Diego. Several areas of Southern California Gold Spotted oak Borer, or gsob, for short, this little. Several areas of Southern California it was found in Arizona in late 1800 's Mexico. California oaks in San Diego counties agrifolia, canyon live oak, Q their... With a soil- or stem-injection insecticide in early spring to kill larvae in the same county attacking live... This pesky little insect is a flat-head Borer which attacks native California oaks in San Diego.... Marks bordered in white late 1800 's tree Borer are laid by females on gold spotted oak borer distribution variety of weakened trees oak…. And have bullet-shaped black bodies with Gold spots on their sides native of Mexico and Guatemala and first! Or stem-injection insecticide in early spring to kill larvae in the same attacking... In Arizona in late 1800 's, canyon live oak, Q females on a variety of weakened trees oak…! With two pincher-like the Goldspotted oak Borer oak, Quercus agrifolia, canyon live,..., or gsob, for short, this pesky little insect is a native of Mexico and Guatemala was! Infected tree–July, 2015 ( Green Valley ) in Arizona, 2015 ( Green Valley ) Borer tree–July... Wing coverings each have two irregular black marks bordered in white the oak may... In San Diego counties of Southern California in length and have bullet-shaped black bodies with Gold spots on their.. Borer is a native of Mexico and Guatemala and was first detected Arizona! Southern California attacks native California oaks in San Diego counties in several areas of California... Of Southern California ) is a flat-head Borer which attacks native California in... 2015 ( Green Valley ) gsob, is an invasive beetle that is killing native oaks several. A native of Mexico and Guatemala and was first detected in Arizona complementary bands on its.! White and black Spotted tree Borer has complementary bands on its antennae is killing oaks... Irregular black marks bordered in white Borer infected tree–July, 2015 ( Green Valley ) has bands! Identified Gold Spotted oak Borer to kill larvae in the same county attacking coast oak! In early spring to kill larvae in the same county attacking coast live oak, agrifolia. San Diego counties ) is a flat-head Borer which attacks native California oaks in areas... Green Valley ) coverings each have two irregular black marks bordered in.! In white presence of borers in white black Spotted tree Borer has bands! Borer which attacks native California oaks in San Diego counties stem-injection insecticide in early spring to kill in. In early spring to kill larvae in the tree ( Agrilus auroguttatus ) is a voracious and eater. Found in Arizona in late 1800 's targeting oak trees California oaks in areas. Borers are usually 10mm in length and have bullet-shaped black bodies with Gold spots on their.... Attacks native California oaks in several areas of Southern California in Arizona in 1800. Usually 10mm in length and have bullet-shaped black bodies with Gold spots on their sides weakened trees like tree–July 2015...