EAB Quick Facts

Emerald Ash Borer – EAB Quick Facts:

Emerald Ash Borer EABEmerald Ash Borer History:

  • EAB was discovered in 2002 in Michigan
  • Brought to North America from Asia in wood crating on cargo ships
  • EAB has no natural predator in the United States
  • Quarantine attempts have been made but have not succeeded
  • 20+ States infested.
  • Spread through transportation of firewood

Emerald Ash Borer Lifecycle:

  • EAB has a one to two year life cycle.
  • Adult Emerald Ash Borers begin emerging from the bark of Ash trees in mid to late May until peak emergence in late June.
  • 2 weeks after emergence females begin laying eggs.
  • Eggs take 1-2 weeks to hatch and then bore through the bark into the cambium (the area between the bark and wood with high nutrient levels.)
  • Larvae feed for several months, this is when the damage to the tree occurs, then overwinter in a small chamber in the outer bark.

How EAB Is Spread:

  • Adults can fly at least ½ a mile, some up to 3 miles which spreads the infestations.
  • Most infestations crossing long distances occur when people move infested nursery trees, logs, or firewood to uninfested areas.

Emerald Ash Borer Effect On Our Environment:

  • Has the potential to virtually eliminate ash trees from North American forests and communities.
  • Ash trees are home and food to over a 100 of animals and insects. Without Ash trees these insects run the risk of becoming extinct.
  • “You end up with a different ecosystem that different species prefer and where the old ones can’t do as well,” -Kathleen Knight, a research ecologist with the Forest Service.
  • Baseball bats are made out of Ash wood. No ash trees = no baseball bats.

Emerald Ash Borer Signs & Symptoms:

  • Canopy dieback, beginning at the top and progressing downward.
  • In later stages, ash trees may form sprouts from the truck and roots.
  • Increased woodpecker activity.
  • Bark can split, exposing “S”- shaped galleries underneath.
  • “D” Shaped exit holes in bark about 1/8 inch in diameter.

"S" Shaped Galleries

“S” Shaped Galleries


Woodpecker Activity On An Ash Tree

"D" Shaped Exit Holes

“D” Shaped Exit Holes

Emerald Ash Borer Treatment:

  • There are three insecticide options available to protect against EAB; A topical spray, a soil drench/injection, and a trunk injection.
  • Best treatment depends on the location of your tree and should be determined by a Certified Arborist.
  • When the right treatment option is chosen and applied correctly, there is no harm to the tree, humans, animals, or the general surrounding environment including other trees and plants.