Emerald Ash Borer (EAB) is a nonnative, invasive insect that has killed millions of ash trees in the Midwest. Native to northern China, eastern Russia, Korea, and parts of Mongolia and Japan, EAB likely arrived here as larvae in wooden shipping crates from Asia.
Unlike ash trees throughout the regions of Asia and Russia that EAB is native to, North American ash species are not equipped with natural chemical defenses against EAB. Also, parasites, other organisms, and diseases that keep EAB in check in its native range are absent in North America. Research on “biocontrol” of EAB with wasp species from its native range could eventually provide some containment or slow its spread. For now, municipalities, including Fitchburg, increasingly are relying on preemptive insecticide treatments to protect healthy ash trees before EAB strikes.
Where EAB Has Been Found in Wisconsin
EAB was first detected in Wisconsin in 2008 in Ozaukee County, but now reaches east to west across the state and can be found as far north as Superior.
The Wisconsin Department of Agriculture, Trade, and Consumer Protection maintains a comprehensive EAB website that includes the following information and map: Confirmed EAB Infestations EAB Quarantine Map Some counties are under quarantine because of their proximity to confirmed EAB infestations in other counties. EAB News Alerts - Subscribe to get email updates for the latest news and events about emerald ash borer in Wisconsin.
Where EAB Has Been Found in the United States
EAB was first detected in North America in 2002 in suburban Detroit and has spread rapidly to several other states, including Wisconsin.