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Emerald Ash Borer Life Cycle
Larvae (immature form)
  • After hatching, larvae bore through bark to feed on ash trees' vascular tissue which transports water and nutrients throughout the tree.
  • Growing larvae zigzag through this delicate tree tissue as they feed, forming S-shaped tunnels that are flat and wide. These tunnels are packed with frass (excrement).
  • Mature larvae are about 1 inch long; they are creamy white with a flat and broad-shaped body.
  • Larvae spend the winter under bark.

Different sizes of EAB larvae

Three different stages of EAB larvae.

(D. Cappaert, MSU)

 

 

EAB larva

Larval EAB feeding on an ash tree's vascular tissue.

(J. Ellis, Purdue University)

 

 



Larval feeding gallery

Larval EAB leave s-shaped feeding tunnels behind as they feed under ash bark.

(Ed Czerwinski, Ontario Ministry of Natural Resources)

 


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