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Identifying Emerald Ash Borer

The Emerald Ash Borer (EAB) is a destructive pest affecting ash trees. Key indicators of an EAB infestation include canopy thinning, epicormic sprouting, and woodpecker feeding activities. Visible signs such as bark cracks and adult emergence holes (~1/8 inch wide) mark the presence of larvae and their feeding tunnels. Proper identification of these symptoms is crucial for effective management. This guide outlines the general symptoms, life stages of EAB, and differentiation from native ash borers, aiding in early diagnosis and response.

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Identifying Emerald Ash Borer

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  1. Identifying Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  2. Identifying Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  3. General Symptoms Epicormic sprouting Canopy thinning Bark cracks Woodpecker feeding

  4. Thinning Crown

  5. Woodpecker Feeding James Smith

  6. Bark Cracking MI Dept. of Ag

  7. Diagnosing Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  8. Native Ash Borers Flatheaded borers Roundheaded borers Clearwing borers Ash cambium miner Ash bark beetles Carpenterworm Jeff Hahn, Univ. of MN

  9. Native Ash Borers Flatheaded borers Roundheaded borers Clearwing borers Ash bark beetle Carpenterworm Dan Hermes Linda Treeful Jeff Hahn Jeff Hahn

  10. Agrilus Damage is Found in Many Tree Types • Oak • Birch • Aspen • Honey locust • Walnut • Boxelder • Many others

  11. Diagnosing Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  12. Damage – Larval Feeding Tunnels

  13. Damage – Larval Feeding Tunnels

  14. Damage – Larval Feeding Tunnels Black ash

  15. Damage – Larval Feeding Tunnels

  16. Damage – Larval Feeding Tunnels

  17. EAB or Not? • Yes • Not • Not Sure

  18. EAB or Not? • Yes • Not • Not Sure

  19. EAB or Not? • Yes • Not • Not Sure

  20. EAB or Not? • Yes • Not • Not Sure

  21. EAB or Not? • Yes • Not • Not Sure

  22. EAB or Not? • Yes • Not • Not Sure

  23. EAB or Not? • Yes • Not • Not Sure

  24. EAB or Not? • Yes • Not • Not Sure

  25. Diagnosing Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  26. Damage – Adult Emergence Holes ~1/8 inch wide

  27. Damage – Adult Emergence Holes

  28. Damage – Adult Emergence Holes

  29. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  30. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  31. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  32. 0 of 30 How Many EAB Exit Holes? • 0 • 1 • 2

  33. Diagnosing Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  34. Life Stages - Larvae

  35. Life Stages - Larvae

  36. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  37. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  38. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  39. 0 of 30 EAB or Not? • Yes • Not • Not Sure

  40. How Many EAB Larvae? • 0 • 1 • 2 • 3

  41. Diagnosing Emerald Ash Borer • General symptoms • Canopy thinning • Epicormic sprouting • Woodpecker feeding • Bark cracks • Native Ash Borers • Damage • Larval feeding tunnels • Adult emergence holes • Life stages • Larvae • Adults

  42. Life Stages – Adults

  43. Life Stages – Adults

  44. Life Stages – Adults

  45. Which of the following is EAB? • A • B • C • D Dan Hermes A B C D J. Hahn unknown J. Hahn

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