Field Guide to Diseases and Insect Pests of Idaho and Montana Forests

Susan K. Hagle – Plant Pathologist,
Scott Tunnock – Entomologist (retired),
Kenneth E. Gibson – Entomologist, and
Carma J. Gilligan – Biological Technician.

U.S. Department of Agriculture, Forest Service, State and Private Forestry, Northern Region, P.O. Box 7669, Missoula, Montana 59807. 1987. Reprint 1990. Publication Number R1-89-54.

Pictures

Figure 1. – Bark beetle gallery patterns.

A – Fir Engraver.

B – Western Pine Beetle.

C – Western Balsam Bark Beetle.

D – Mountain Pine Beetle.

E – Spruce Beetle.

F – Douglas-Fir Beetle.

G – Engraver Beetles.

H – Red Turpentine Beetle.

Figure 2. – Comparison of three common types of defoliating insect larvae.

A – Caterpillar.

B – Sawfly.

C – Looper.

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