A network of Douglas-fir tussock moth pheromone traps is in place throughout the western US. These traps are monitored annually with the expectation that the number of moths caught in the traps will increase for several years prior to the onset of visible defoliation, thus giving land managers an early warning. Learn more about this Early Warning System, or view an overview of DFTM in the Pacfic Northwest.
View DFTM summary reports for 2007 (1.0 MB pdf) 2006 (606K pdf), 2005 (326K pdf), 2004 (284K pdf), 2003 (312 KB pdf), or 2002 (1.3MB pdf). Maps showing trap catches (.pdf format, generally 500 - 650K each) are also available for:
Download a copy of the DFTM Early Warning System database -- a 1 MB WinZip file containing an Access2007 database with data through 2010 for northern ID, OR & WA, and through 2006 (or earlier) for most other western states (last updated on December 2, 2010). The graphs shown below are products of this database.
OR & WA DFTM Pheromone Trap Catch Trends
A summary table of data for Oregon and Washington from 1999-2010 is now available as an 18 page, 78K PDF file. This summary includes all 2010 data for Oregon and Washington and was last updated on December 2, 2010. Contact Kathy Sheehan (503-808-2674) for additional information.
Graphic displays of 1979 through 2010 data are available for the following National Forests and Reservations in Oregon and Washington. The 2010 data includes 91% of the expected 2010 traps, but high trap catches have not yet been verified. Each display includes data collected both on and nearby the Forest or Reservation.
DFTM Pheromone Trapping Publications of Interest:
How to Use Pheromone Traps to Determine Outbreak Potential (Daterman, Livingston, Wenz, and Sower -- 1979)
How to Identify Tussock Moths Caught in Pheromone Traps (Daterman, Livingston, and Robbins -- 1977)
Early Warning System for DFTM Oubreaks in the Western U.S. (Daterman, Wenz, and Sheehan -- 2004)
This webpage was last updated on December 2, 2010.