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Emerald Ash Borer. Agrilus planipennis Frank Hoehle. Introduction. The emerald ash borer is an Asian beetle which was first detected in the US in Canton, Michigan, possibly being introduced here by overseas shipping container.

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Emerald Ash Borer

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emerald ash borer

Emerald Ash Borer

Agrilus planipennis

Frank Hoehle


The emerald ash borer is an Asian beetle which was first detected in the US in Canton, Michigan, possibly being introduced here by overseas shipping container.

Its mortality rate on healthy ash trees is very high, and the beetle has proven to be very hard to kill.

Currently all ash trees in North America are in danger of dying from this infestation, and it is being compared in magnitude to Dutch Elm Disease or Chestnut Blight.

the villan
The Villan

While it is a small bug, its impact is huge

specifications of the beetle
Specifications of the Beetle
  • Dark Metallic Green
  • 1/3 of inch long
  • 1/16 inch wide
  • Body narrow and long
  • Head flat
  • Larvae approx 1 inch long, creamy white
  • Eggs, brown
  • Eggs are laid in crevasses in bark
  • Dark brown in color
  • Turn yellow brown prior to hatch
  • Are laid in groups from 75-300
  • Eggs laid from May to Mid-July
  • Actually the stage which kills tree
  • Eggs hatch into larvae, which burrow through bark into tree
  • Consume Cambium and Phloem, effectively girdling the tree
adult emerald ash borer
Adult Emerald Ash Borer
  • Emerges in may-July
  • Female lays numerous eggs

in bark crevasses and

between bark layers

  • 3-6 week life span
  • Eats ash leaves but doesn’t

really affect tree health

what is affected
What is Affected?
  • While everything in the genus Fraxinus is in danger (unlike other blights which have usually threatened single species) the Emerald Ash Borer prefers Green Ash and Black Ash trees.
  • White Ash is killed after Green and Black Ash trees are eliminated.
  • Blue Ash shows some resistance by forming callous tissue around EAB galleries, but usually succumbs eventually
ash trees affected
Ash Trees Affected

Green Ash

Black Ash

more affected ash
More Affected Ash

White Ash

Blue Ash

  • First detected in Canton, Michigan in June 2002
  • Brought in by overseas shipping container (suspected)
  • Now found in 14 states including Pennsylvania

EAB Detection Box

control of emerald ash borer
Control of Emerald Ash Borer
  • So far, attempts at control have ranged from:
  • Quarantine of affected wood products (they can still fly)
  • Application of Emamectin Benzoate insecticide (too costly for widespread use)
  • Direct cambial layer injections successful
  • Release of parasitic wasps (unknown possible consequences)(North American ash still succumb when planted in Asia, even with present parasitoid populations of these wasps)
even stumps should be removed
Even Stumps should be Removed

If stumps are not removed eggs could still be under bark left

  • US Forest Service
  • www.emeraldashborer.info
  • www.entm.perdue.edu
  • ento.psu.edu
is the end near
Is the end Near?
  • At the present time, the future looks bleak for the Ash population, as no effective strategy has been developed yet. Some companies selling remedies such as TREE-age, but unknown effectiveness over time.
what can you do
What can you do?
  • Do not transport affected timber products out of your area
  • Use locally available firewood
  • Leave firewood at campsites..don’t take it home you cheapskate!
  • Treat infested trees if possible to kill EAB.
  • Consult local arborist or forester