Monitoring Douglas-fir Tussock Moth Outbreak Populations across Southern Idaho in 2018
Lowrey L, Saavedra A, Jorgensen C. 2019. Monitoring Douglas-fir Tussock Moth Outbreak Populations across Southern Idaho in 2018. U.S. Forest Service. Boise Field Office
A Douglas-fir tussock moth (DFTM) (Orgyia pseudotsugata McDunnough) outbreak began in 2015 in southern Idaho and population progression has varied depending on location. In 2015 and 2016, high trap catches of adult DFTM on the Salmon-Challis, Sawtooth and Boise National Forests indicated an outbreak was developing across historically defoliated areas (Lowrey 2016). Numerous egg, caterpillar, virus and defoliation surveys have been completed to describe the progression of this outbreak across southern Idaho (Lowrey 2015, 2016, 2017). In 2018 nearly the entire Grassy Cone stand was defoliated (31 acres) and the moths had begun to defoliate the Douglas-fir stand on Sunset Cone. This report details the results of surveys in 2018, the status of the outbreak, provides recommendations (to deter Douglas-fir beetle), maps and discussion.
- Type
- Unpublished Report
- Authors
- Lowrey, Laura; Saavedra, Angel; Jorgensen, Carl
- Date of Issue
- 2019-03-12
- Publisher
- U.S. Forest Service
- Units
- CRMO
- Keywords
- Douglas-fir Tussock Moth, Rusty Tussock Moth