Missoula, MT : U.S. Dept. of Agriculture, Forest Service, Northern Region
Abstract
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
