Long Term Effects of 2,4-D on Lanceleaf Rabbitbrush and Associated Species

Abstract

If properly applied, 2,4-D reduces rabbitbrush and forbs and allows grass to increase. This would be a desirable management tool on cattle ranges. The most effective kill of rabbitbrush was obtained with a treatment applied in June 1956 when soil was moist and when rabbitbrush was nearly in full leaf. When soil was dry and rabbitbrush was in bloom, spraying had no effect. Spraying before rabbitbrush was in full leaf reduced forbs but increased production of rabbitbrush.