Bark staining on coast live oak. The goldspotted oak borer (GSOB), Agrilus auroguttatus (Coleoptera: Buprestidae), is a flatheaded borer introduced to San Diego County, California, in the late 1990s or early 2000s and also detected at one site in Riverside County in 2012.

Jul 26, 2016 · Live Oak has few insect pests but there are some that prove bothersome to homeowners. The following are two of the most common pests of Live Oaks and how to manage them: Typical galling on Live Oak

The goldspotted oak borer, Agrilus auroguttatus (Coleoptera: Buprestidae), was first associated with oak mortality in San Diego County, California in May of 2008. Since that time, a research and survey program has outlined the biology of this flatheaded borer in the

Adult goldspotted oak borer, Agrilus auroguttatus, an exotic insect threatening red oaks in California (Adults are approximately 0.35 inches long by 0.08 inches wide).

The goldspotted oak borer can attack and kill coast live oak (Quercus agrifolia), California black oak (Quercus kelloggii), and canyon live oak (Quercus chrysolepis). This beetle is only currently known to feed on oak tree species. No other oak species have recorded infestations and deaths comparable to the three known host species.

Canyon live oak, Q. chrysolepis Liebm. have been attacked and killed by the goldspotted oak borer but at low levels. GSOB were discovered in isolated infestations in Riverside, Orange, Los Angeles and San Bernardino Counties in 2012, 2014, 2015 and 2019 respectively.

Researchers are testing several management tactics for goldspotted oak borer (GSOB) in Southern California. ... Infested Live Trees. Chemical treatment is only appropriate to control low-level infestations in lightly damaged, high-value trees, or to prevent infestation of uninfested trees. Treating a heavily infested tree that has already ...

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. In 2008, it was found attacking coast live oak, Quercus agrifolia, canyon live oak, Q. chrysolepis, and California black oak, Q. kelloggii, on the Cleveland National ...

Mar 4, 2025 · California’s oak trees are under siege. The Goldspotted Oak Borer (GSOB), an invasive beetle species, has caused the death of tens of thousands of oak trees across Southern California, threatening not only ecosystems but also the cultural and economic vitality tied to …

Mar 21, 2013 · Borers are beetle or moth larvae that develop under the bark of trees, damaging the wood and eventually killing the tree. Unhealthy trees are more susceptible to borers, so the best defense is to keep your oak tree (Quercus spp.) watered, fed and properly pruned.