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    Author(s): Gary E. Daterman; John M. Wenz; Katharine A. Sheehan
    Date: 2004
    Source: Western Journal of Applied Forestry. 19(4): 232-241
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (707 KB)


    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 pet 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.

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    Daterman, Gary E.; Wenz, John M.; Sheehan, Katharine A. 2004. Early warning system for Douglas-fir tussock moth outbreaks in the Western United States. Western Journal of Applied Forestry. 19(4): 232-241


    Orgyia pseudotsugata, pheromones, trap-catches, defoliation, tussock moths.

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