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Officials warn of invasive tree-killing pest detected in Big Bear area

Forest and fire officials ask for the public’s help to stop the spread of gold spotted oak borer

SAN BERNARDINO, Calif. — The invasive goldspotted oak borer (GSOB, Agrilus auroguttatus) was detected last week in recently-killed and dying California black oaks on private property in the unincorporated San Bernardino County community of Sugarloaf.

Larval, pupal and adult life stages of the beetle were extracted by the California Department of Forestry and Fire Protection (CAL FIRE) and U.S. Forest Service personnel from under the tree bark.

A San Bernardino County Fire Hazard Officer, who had received GSOB identification training, made the initial discovery while conducting hazard inspections. This is the second GSOB infestation identified in San Bernardino County, the first discovery being in the Oak Glen area in fall of 2018.

This is also the second GSOB infestation on the San Bernardino National Forest, the first being in Idyllwild in 2012.

The long-range spread of GSOB from its native range in Arizona to San Diego, then Riverside, Orange, Los Angeles counties and, now, San Bernardino County, has been attributed to the movement of GSOB-infested firewood. Therefore, it is critical to take precautions to avoid transporting potentially-infested oak firewood within, to or from the San Bernardino Mountains.

GSOB may already be in other portions of San Bernardino County but haven’t been discovered yet. These non-native beetles aggressively attack California black oaks, coast live oaks and even canyon live oaks, whether in mountain communities, forests, valleys or cities.

To make matters worse, GSOB prefer larger oaks, the very trees we depend on for beauty, shade and wildlife habitat.

Learn about GSOB at, including how to identify and report a suspected GSOB infestation.

If you have oak trees that have recently died and have been cut down, it’s critical to make sure the wood is not infested before transporting it! The GSOB website has information on how to manage infested wood.

Dorsal view of an adult female goldspotted oak borer, Agrilus auroguttatus (Coleoptera: Buprestidae). (photo: USDA Forest Service, Northeastern Area Forest Health Protection, Durham, NH Office)

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