Treatments May Save Special Ash Trees

The Wisconsin Department of Natural Resources (DNR) encourages property owners to watch for D-shaped exit holes and woodpecker damage and flecking (bark removal) on their ash trees this winter. 

Property owners who detect an Emerald Ash Borer infestation in its early stages – often by looking for woodpecker damage – can take steps to protect their high-value ash trees by treating them with insecticide between mid-April and mid-May. Insecticide treatments are seldom practical or economical for woodlot ash trees.

The DNR advises owners who have a tree they would like to save to consult a local arborist at and