Emerald Ash Borer


You may have heard the announcement that Emerald Ash Borer (EAB) has been found in northern Maine – Madawaska.

Finding it in Maine is not a surprise as it has been discovered in 34 other states including throughout New England, and in the provinces of Ontario, Quebec, Manitoba and New Brunswick.  Though it was expected EAB would first be detected in southern Maine.

Emerald Ash Borer is a non-native beetle that attacks and kills ash trees. It is native to China, eastern Russia, Japan, and Korea and was first detected in North America in Michigan, in 2002, likely having been transported in shipping material.  

Eradication efforts have been unsuccessful.  Removal of wide areas of infected trees, which has worked with some other introduced insects, have proven to be fruitless.  Spraying does not work. EAB has no native enemies to keep it in check and is highly mobile.

EAB is a very serious pest to ash trees, causing wide spread mortality wherever it has been found.  Once infected, the tree will die within 3-5 years.

The finding of EAB will result in a quarantine of the area to slow the spread. Efforts to reduce the chance of new areas be infected will be important.  However, because the insect can fly, its spread is inevitable.

Woodland landowners with a significant number of ash trees, particular larger trees, will want to consider a timber harvest in the next few years or risk losing their value.

We will have a full discussion of the insect, and update of rules and quarantines, and forest management recommendations in our next newsletter and on our website www.mainewoodlandowners.org

Tom Doak

Executive Director

More information about emerald ash borer is available at: