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Emerald Ash Borer Life Cycle
Pupae
  • 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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