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703-324-1770 TTY 711

pestmail@fairfaxcounty.gov

12055 Government Center Parkway
Suite 518, Fairfax, Va 22035

@ffxPublicWorks

Brian Keightley
Division Director, Urban and Community Forestry

Department Resources

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Forest Pest Annual Report Highlights

The Fairfax County Board of Supervisors instruct the Forest Health Branch of the Urban and Community Forestry (UCFD) to monitor for, provide necessary and effective control of, and offer outreach and education about several forest insect pests and diseases. This report describes work completed by staff in 2023 including monitoring, inventories, treatment, and education/outreach. Of the 11 insects, diseases and animals monitored by UCFD, seven of them are found in Fairfax County.

Below are highlights of the full 2023 Forest Pest Annual Report. For questions about any of the topics below, please email treemail@fairfaxcounty.gov or call 703-324-1770, TTY 711.

Team photo of the forest pests team taken in 2023. — Team photo, 2023

Emerald Ash Borer (EAB)

There are 186 trees currently included in the EAB (Agrilus planipennis) treatment program.

Photo showing adult Emerald Ash Borer, photo credit Davis Cappaert, Michigan State University — Adult EAB, Davis Cappaert, Michigan State University

Photo showing staff administering treatment for EAB. 186 ash trees that were evaluated in the County-wide ash treatment remain in the program. Six ash trees were added for a new total of 192 trees. Fifteen trees were treated for EAB. — 186 ash trees that were evaluated in the County-wide ash treatment remain in the program. Six ash trees were added for a new total of 192 trees. 15 trees were treated for EAB.

Staff continued to monitor locations where EAB parasitoids were released within the last two years using yellow-pan traps to determine if the parasitoids have become established.

Since 2016, staff has conducted a release program for EAB parasitoid wasps: Oobius agrili, Spathius agrili, and Tetrasticus planipennisi.

Oobius agrili, the parasitic wasp that is a predator of EAB larva.

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