Sagebrush defoliator outbreak in Northern California

Ralph C. Hall

Treesearch

Sagebrush defoliator outbreak in Northern California

Informally Refereed

Authors:

Ralph C. Hall

Year:

1965

Type:

Research Note

Station:

Pacific Southwest Research Station

Source:

Res. Note PSW-RN-075. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 12 p

Download (PDF 666 KB)

Download (PDF 666 KB): https://research.fs.usda.gov/download/treesearch/33574.pdf

Abstract

The sagebrush defoliator was responsible for varying degrees of sagebrush defoliation and mortality over a widespread area in southeastern Oregon, northeastern California, and northwestern Nevada in 1963 and 1964. Severe defoliation sometimes killed sagebrush in a single season. Indications are that the outbreak will continue at least another season. A. websteri has a single annual generation. It is attacked by several species of parasites and predators; the most important of these in California was a Copidosoma.

Citation

Hall, Ralph C. 1965. Sagebrush defoliator outbreak in Northern California. Res. Note PSW-RN-075. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 12 p