Emerald Ash Borer
EAB is a small, brilliant green beetle about the same size as the native Bronze Birch Borer, which kills white birch. These adults lay eggs on the bark of ash trees. Upon hatching, the tiny larvae bore under the bark and begin feeding in the cambial layer (the transport system) of the tree. These larvae feed in winding serpentine patterns under the bark, essentially girdling the trees as they go. Upon maturing, the adult exits the bark forming a distinctive "D" shaped exit hole. Signs to look for include bark cracking, crown dieback, heavy woodpecker activity and sprouts on the trunk of the tree. It usually takes 2-5 years for the tree to fully show damage from EAB. Unfortunately, many of these signs are also indicative of other disease and insects that already infect our ash. If you suspect that your trees may have this insect, please contact the Forestry Division, a County horticulture agent, or a Department of Natural Resources (DNR) Forest Health Specialist. For more information on EAB please read the Wisconsin Emerald Ash Borer Resource Guide.
City of Manitowoc EAB Management Plan
In 2009, the City of Manitowoc worked with surrounding communities, as well as local and state agencies to form and maintain an EAB management plan. The most recent version of the plan can be found by clicking on this link: EAB Management Plan.
EAB Within the City of Manitowoc
On July 26, 2017, the City of Manitowoc received confirmation from the Wisconsin Department of Natural Resources that Emerald Ash Borer (EAB) was detected in the City for the first time. EAB was confirmed in the 900 block of S. 20th St., and infested trees were seen on public and private property in the immediate vicinity. Most of the City-owned trees will typically be removed by the Forestry crew between late fall and early spring when EAB is inactive.
These websites offer more detailed information about EAB: