Emerald Ash Borer

The adult Emerald Ash Borer is a metallic green insect that is native to Asia and eastern Russia. The exotic pest was first discovered in the United States near Detroit, Mich., in 2002, and is believed to have arrived in the state in wooden pallets. It was first detected in Wisconsin in 2008, and just last week was confirmed in Door County. Once present, the insects kill all untreated Ash trees within a few years.


Number of Wisconsin counties that are under quarantine due to confirmation of Emerald Ash Borer presence. Door County was the latest to be added to the list on June 10 with the discovery of the insects on Cottage Row just south of Fish Creek.


Number of states where the Emerald Ash Borer has been confirmed.

60 to 90

Number of eggs a female Emerald Ash Borer will deposit in the crevices of Ash tree bark.


Number of purple traps that are being distributed in Wisconsin this summer to detect the presence of Emerald Ash Borers.

5 million

Estimated number of urban Ash trees in Wisconsin.

50 million

The number of Ash trees dead or dying in the Midwest due to the Emerald Ash Borer. More than 30 million Ash trees were killed in southeastern Michigan alone, where the insect was first discovered in this country.

770 million

Estimated number of Ash trees in Wisconsin forests, or nearly seven percent of the total tree population.

Source: Wisconsin Department of Agriculture, Trade and Consumer Protection;