Abstract
The development of procedures for controlling big sagebrush (Artemisia tridentata Nutt.) by spraying with 2,4dichlorophenoxyacetic acid (2,4-D) causes concern about the possible loss of desirable forbs and shrubs on treated ranges. Blaisdell and Mueggler (1956) studied the effects of 2,4-D sprays on many forbs and shrubs associated with big sagebrush and emphasized the importance of careful range evaluations before spraying. They reported that spraying in eastern Idaho left antelope bitterbrush (Purshia tridentata (Pursh) DC.) unharmed or only slightly damaged. However, spraying with 2,4-D in eastern Oregon has caused effects on bitterbrush varying from no apparent damage to severe stand reductions. The importance of this species as fall and winter forage for cattle, sheep, and deer justifies further attention to the nature of susceptibility of bitterbrush to
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