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Research Notes

Title: Sagebrush defoliator outbreak in Northern California

Author: Hall, Ralph C.

Date: 1965

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

Station ID: RN-PSW-075

Description: 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.

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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.