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EAB for Homeowners
Identification & Biology
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
  • When warmer weather arrives (usually in April), larvae enter the pupal stage. During this stage they will transform from larvae into sexually mature adults.
  • Larvae remain under bark as they pupate.
  • Adults emerge from the tree as soon as their development is complete.

EAB pupae

Early stage of pupation.

(USDA Forest Service)


Emerald ash borer pupae

Late stage of pupation.

(USDA Forest Service)


Pre-pupal chambers

EAB spend the winter under ash tree bark as pre-pupae.

(Brian Sullivan, USDA APHIS PPQ)

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