Bark BeetlesBy: Marissa Cheyne

Spruce Beetle(Dendroctonus rufipennis)

Hosts- Engelmann spruce, rarely lodge pole pine

Attack Trees less than 12 inches diameter

Red-Brown boring dust on bark through Mid May- July

Red Turpentine Beetle(Dendroctonus valens)Host: Ponderosa and lodge pole pine. Can infest any pine species

Beetle gallery

Largest & Weakest Trees are attacked: Trees also injured by fire, logging, and other damages

Very Large Red Pitch tubes

Western Pine Beetle(Dendroctonus brevicomis)

Host: Ponderosa Pine

Kills trees that are less than 6 inches

Mountain Pine Beetle(Dendrotonus

ponderosae)Hosts: All Native and introduced species of pines

Kills trees less than 5 inches

Douglas Fir Beetle(Dendroctonus pseudotsugae)

Hosts: Douglas Fir, Western Larch

Attack trees less than 12 inches

Ambrosia Beetle(Trypodendron

spp)Hosts: True Firs, Spruce, Douglas Fir, Hemlock, Larch, Pine

Attacks tree that are weak, dying or recently cut

Works CitiedLeatherman, D.A.. ""Mountain Pine Beetle"." Colorado State

University. Colorado State University Extension, 3 2012. Web. 19 Nov 2012. <www.ext.colostate.edu>.

Seybold, S.J.. ""Bark Beetles"." UCIPM Online. UC ANR, 08 2012. Web. 14 Nov 2012. <www.ipm.ucdavis.edu>.

Hagle, Susan. "Bark Beetles and Wood Borders". Missoula, Montana: U.S. Department of Agriculture Forest Service, 1987. 34-45. Print.