Larvae are white and legless, galleries similar to elm bark beetles. Remove and burn infested branches and trees. Twig and branch feeders, may be responsible for decline of isolated branches, abundant honeydew production. This is primarily a Christmas tree problem. Needles on infested trees turn reddish-brown, boring dust may be found at the base of the tree.
Trees usually dies within a year.
Dendroctonus in late June. Look for white-flecks or brownish foliage. Larvae found in clusters on the foliage. The center pitch of these shoots will be hollow. This a a quarantine pest not presently found here.