posted by: USDA Forest Service Pacific Northwest Region Forest Health Protection |
Douglas-fir Tussock Moth (DFTM) Douglas-fir tussock moth
is a native defoliator of Douglas-fir and true fir trees. It typically
exits at low numbers, but periodically erupts into huge population
levels which can completely defoliate trees in a single season producing
widespread mortality and top kill.
DNR monitors about 190 pheromone trap sites in Washington. These trapping results are integrated with those of other landowners to provide early warning of rising DFTM populations. Overall, 2004 trap catches were very low indicating stable, low populations. DFTM outbreaks throughout the northwest have mostly subsided from 2000-2002.
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WADNR Forest Health Home Washington Department of Natural Resources PNW Region Forest Health Protection |