EAB Infestation Map

Below is the current map of emerald ash borer (EAB) infestation across North America. Mississippi was added on Nov. 14, 2025. EAB is now present in 38 states and six Canadian provinces. An up-to-date map is available on our website.

EABU Returns in April!

EAB University returns for our Spring seminar series beginning in April. Additional webinars will be announced for May and June as the schedule is finalized. Check the EABU schedule for updates!

April

9

Ash is regenerating in forests where emerald ash borer has been present for over 20 years 

Caleb Wilson, Asst. Professor, Dept. Of Entomology, U of Kentucky

1:00 p.m. EST

April

16

Beech leaf disease: A new nematode disease of beech trees in North America

David Burke, Vice President for Science and Conservation Holden Forests and Gardens 

1:00 p.m. EST

April

28

Title TBA (Spotted Lanternfly)

Anne Johnson, United States Forest Service

1:00 p.m. EST

Spring is the best time to treat your trees!

Studies show that spring insecticide treatments for EAB are more effective than the same treatments applied in fall. A 2023 open‑access article in the Journal of Integrated Pest Management addresses common myths, including that treatment is too costly, harms nontargets, injures trees or is pointless because EAB will kill them anyway. The authors note that timely spring applications remain an effective way to keep many ash trees alive. 

Recent EAB News

Volunteers collect Oregon ash seeds to fight EAB

Volunteers across the West helped collect Oregon ash seeds to support research on resistance to emerald ash borer. OSU Extension trained more than 930 participants to standardize collection and expand coverage. The effort produced 149 seed lots, roughly 147,500 seeds, now stored for future genetics work.

Iowa chainsaw artist turns ash trees killed by invasive beetle into public art

An Iowa chainsaw artist is transforming ash trees killed by emerald ash borer into public art. Gary Keenan has been commissioned by several Iowa communities to carve the remaining stumps into sculptures ranging from wildlife to whimsical figures. His work offers a creative way to honor trees lost to EAB and bring new life to public spaces across the state.

Other News

Hemlock Woolly Adelgid BioControl

New York officials and Cornell’s New York State Hemlock Initiative confirmed that Laricobius nigrinus, a predatory beetle released to combat hemlock woolly adelgid, is now reproducing successfully in the lower Hudson Valley. Teams collected more than 12,000 beetles from Harriman State Park, far exceeding expectations and allowing redistribution to new sites in New York, New Hampshire and Vermont. 

Michigan awards $2.4 million for state invasive species prevention and control

The state of Michigan today announced that 27 projects will share $2.4 million in funding through the Michigan Invasive Species Grant Program for efforts that address the prevention, detection, eradication and control of aquatic (water-based) and terrestrial (land-based) invasive species. 

Funding available for protection of hemlock trees across Ohio

Ohio’s Division of Forestry is launching a new cost-share program to help private landowners treat hemlock woolly adelgid in stands of one to 25 acres. The program pays $700 per acre for HWA treatments, which can be applied by landowners or contractors, with applications open through March 20.

Does Cold Weather Bug The Bugs?

Wisconsin’s late‑January polar vortex prompted questions about whether extreme cold could reduce insect pests. DNR forest health staff report that most insects are well adapted to midwinter temperatures, and this year’s cold snap is unlikely to significantly affect major species like EAB or spongy moth. Overall, cold weather rarely reduces insect populations enough to change long‑term trends.