Forest & Grassland Health

Snow-capped mountains against a blue sky with tree tops in the foreground.

Forest Health Protection (FHP) is responsible for technical assistance for forest health activities and monitoring and reporting on the health of all forest lands in the Pacific Southwest Region.

We work in partnership with the National Forest System, other federal agencies, states, Native American tribes and the private sector, to provide assistance, technical expertise, and forest health information.

FHP has specialists in: forest pathology; forest entomology; pesticide use and safety; remote sensing and geographic information systems.

FHP provides assistance in the following areas:



Cold tolerance and seasonal generations of western pine beetle in CA

Historical temperature records suggest that episodes of western pine beetle winter mortality in California due to extreme cold temperatures are infrequent and mostly restricted to the northeastern parts of the state. Most areas on the west slope of the Sierra Nevada range, especially lower elevations of the ponderosa pine belt, have likely never experienced significant winter mortality of western pine beetle during the period of record. Monitoring in 2017 found no increase in the number of generations of western pine beetle on the Lassen and Stanislaus National Forests compared to historic observations when differences in elevation and latitude are accounted for.

Goldspotted Oak Borer in Southern California


The goldspotted oak borer (GSOB) Agrilus coxalis (Coleoptera: Buprestidae), is a wood borer native to southeastern Arizona, southern Mexico, and northern Guatemala. It is believed to be introduced into California and was first collected in San Diego County in 2004. In 2008, GSOB was linked to continuing oak mortality occurring in San Diego County since 2002 across all land ownerships. It is now also found in Riverside County.

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Invasives Caught Entering the State!!

Invasive plants and insects stopped at CDFA Border Stations

Success Stories & Recent Publications

Forest Health Protection-funded Project Success Stories and recent publications.


Hot Issues!!

Important Forest Health Protection issues in Region 5 include

National Invasive Species Program Award!

The postcard shows a pile of burning logs with a bug crawling out of it.

Members of the Pacific Southwest Region Forest Health Protection (FHP) staff were granted the national Excellence in Invasive Species Prevention Award for 2011...