Tree Beetle Info

How do I know if my trees are infested with beetles?

Pitch Tubes & Boring Dust

Infested trees usually have several masses of resin exuding from a hole that’s been chewed into the bark by a beetle. However, in years with below average precipitation, pitch tubes may not form. The tunneling of the beetles also creates boring dust that falls around the base of the tree, in bark crevices, and around the pitch tubes (if present).

Fading Needles & Woodpecker Damage

Following a successful attack, Spruce needles will turn a pale yellowish-green color, and Douglas-fir needles will fade to reddish-brown. Trees may retain their needles for several years following an attack or drop their needles as they begin to fade. Woodpeckers will often search for beetle larvae in infested trees, stripping the bark off the tree and leaving behind large holes.

For assistance identifying potential beetle infestations, contact your local CSFS field office.

Beetle tree.pdf

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