spruce budworm

the larva of a common tortricid moth, Choristoneura fumiferana, that is a destructive pest primarily of spruce and balsam fir in the northern and northeastern U.S. and in Canada.


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Spruce budworm and pine bark beetle infestations have resulted in extensive
  areas of standing dead trees.
Ecologists first discovered similar signals in computer simulations of spruce
  budworm outbreaks.
Conifer dominated stands indicate a heavy past influence of spruce budworm.
In the surrounding uplands, spruce budworm infestations have likely damaged
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