Emerald Ash Borer

Emerald Ash Borer, also known as EAB, is a devastating insect that attacks and kills all species of the Ash family. The EAB is an invasive flathead borer, it's larvae creates tunnels also known as galleries under the bark of the tree. The tunnels under the bark cuts off water and nutrient supply. This causes dieback in the canopy and then will kill the tree.


  • Crown dieback, leaves wilting and turning yellow water sprouts can show up throughout the tree
  • Native birds like Woodpeckers will be attractive to the larvae
  • The young borers will emerge from the bark leaving D shaped exit holes
  • The bark may split or fall off

Life Cycle:

  • Larvae emerge out of the D shaped exit holes
  • Larvae feed off the sapwood creating galleries
  • Larvae will spend the winters under the bark
  • Borers will emerge in May/June around the time of the black locust bloom

Control Methods:

  • Remove infested trees, remember it is less costly to remove a healthy live Ash tree then a dead one
  • Injection is a great control method and is very effective. Treatments last 2-3 years
  • Talk to an ISA Certified Arborist at Pro-Tree for more information