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EAB for Homeowners
Identification & Biology
Ash Identification Presentation
EAB Look-Alikes
EAB Locations
EAB Management
Protecting Ash Trees with Insecticides
Quarantine Information
Information for Industries and Organizations
Self Study Programs
Arrest that Pest and Other Educator Resources
Report a Suspected Infestation
EAB on YouTube
Emerald Ash Borer Life Cycle
Mating and Eggs
  • Adult females mate and lay eggs soon after they emerge in late May. Adult emergence continues through mid-summer so eggs are deposited over an extended period.
  • Females deposit eggs individually on bark surface or in bark crevices on trunks or branches. The egg-laying period in Indiana probably continues through late July.
  • Eggs are a light yellow color, oval shaped, and about 4/100 of an inch long.
  • Each female lays about 75 eggs during her lifetime.
  • Eggs hatch in 7 to 10 days into worm-like larvae.

Mating adult emerald ash borers

Mating adults on the bark
of an ash tree.

(Brian Sullivan, USDA APHIS PPQ)

Egg cluster

Cluster of EAB eggs.

(D. Cappaert, MSU)


Larva about to hatch from egg

Larva about to hatch from egg on bark's surface.

(H. Liu, MSU)

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