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Early Warning System for Douglas-Fir Tussock Moth Outbreaks in the Western United States

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The Early Warning System is a pheromone-based trapping system used to detect outbreaks of Douglas-fir tussock moth (DFTM, Orgyia pseudotsugata) in the western United States. Millions of acres are susceptible to DFTM defoliation, but Early Warning System monitoring focuses attention only on the relatively limited areas where outbreaks may be developing. During 20+ years of monitoring, the Early Warning System provided warnings of 1–3 years for seven of nine outbreaks. No warnings were provided for two outbreaks because of inadequate density and distribution of Early Warning System plots in those specific areas. Plots should be evenly distributed over host-type forests at a density of at least 1 Early Warning System plot per 3,000 ac. After potential outbreaks have been identified by the Early Warning System, ground sampling for egg masses and larvae is necessary to characterize local DFTM populations. West. J. Appl. For. 19(4):232–241.

Keywords: Orgyia pseudotsugata; defoliation; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; pheromones; trap-catches; tussock moths

Document Type: Regular Article

Affiliations: 1: Pacific Northwest Region USDA Forest Service P.O. Box 3623 Portland OR 97208-3623 Phone: (503) 808-2674, Email: 2: Retired Pacific Northwest Research Station USDA Forest Service 3200 Jefferson Way Corvallis OR 97331 3: Pacific Southwest Region, Stanislaus National Forest USDA Forest Service 19777 Greenley Road Sonora CA 95370

Publication date: October 1, 2004

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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