Emerald ash borer adults will be emerging from infested trees over the next 2 to 3 weeks. These ½-inch long metallic green insects will chew irregular notches into the edges of ash leaves (Figure 1). The feeding will not harm the tree but it provides a good indication that the insects are present and active. Eggs laid by females will lead to the damaging borer stage that will feed beneath the bark from late summer to early fall.
The familiar purple emerald ash borer (EAB) survey traps will not be hung this summer so detection of spread of the beetle will rely on observations by arborists, landscape professionals, and homeowners living in areas where EAB has not been reported. Report suspected findings to your local Cooperative Extension Service office. Watch for the insects, leaf-feeding damage, or D-shaped emergence holes in the bark.
By Lee Townsend, Extension Entomologist