LEBANON, Maine (AP) Entomologists in Maine are confirming the presence of a destructive, invasive forest pest in the southern part of the state.

The Maine Department of Agriculture, Conservation and Forestry says the emerald ash borer was found in western York County. The department calls the discovery an “alarming new development.” The borer was discovered in far northern Maine in the spring.

The borer destroys ornamental and forest ash trees. It was found in Michigan in 2002 and has spread rapidly. It has been found in 35 states and four Canadian provinces.

The state says the York County borers were found in traps in Acton and Lebanon. There are now ground surveys going on in the area.

Ash trees infested with the borer might die in less than three years.