The unusually large amount of ice, snow, and wind-damaged trees that occurred during the winter of 1996-97 provided prime habitat for populations of the Douglas-fir beetle (DFB) (Dendroctonus pseudotsugae) to build to epidemic numbers. Beetles emerged during the spring and summer of 1998, attacking hundreds of thousands of standing Douglas-fir trees. Beetle attacks continued in green trees in 1999. This report documents DFB population assessments in 1999, including ground surveys of current beetle populations and aerial survey, which reports 1998 killed trees.
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