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Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is a non-native beetle that was discovered in southeastern Michigan  in 2002. The larvae feed on the inner bark of ash trees, disrupting the tree’s ability to transport water and nutrients and kills all native ash trees (Fraxinus spp.). Emerald ash borer is now found in 35 states and several Canadian provinces.

EAB was discovered in Tompkins County for the first time in 2018, including on the Cornell campus and within Cornell Botanic Gardens. We are actively managing EAB in ash tree collections within the F. R. Newman Arboretum through the use of systemic pesticides. Within our natural areas, ash trees make up 5-30 percent of the mature tree canopy. While selected ash trees are also being treated with pesticides, the remaining trees that pose a safety risk to developed infrastructure will be removed.

What can you do?

Browse these recommended resources for more information and how you can help prevent the spread of Emerald Ash Borer.

USDA Website

Learn what to look for on ash trees by visiting the United States Department of Agriculture 
Animal and Plant Health Inspection Service website.

Report Suspect Trees

To report ash trees suspected to be infested with EAB in New York, visit the Dept. of Environmental Conservation EAB site.

Location Map

View a map of known EAB locations and quarantined counties in New York State.

Emerald Ash Borer in Tompkins County

Information provided by the Tompkins County Cooperative Extension

New York State Invasive Species Information

Find the latest updates and sources of information on the New York State Invasive Species Information Clearinghouse.

Emerald Ash Borer Information Network

A National Resource on Emerald Ash Borer