Control of honey mesquite with herbicides: influence of stem number

Abstract

Following aerial application of herbicides, stands of honey mesquite (Prosopis glandulosa var. glandulosa) were evaluated to determine the influence of individual plant stem number on herbicide efficacy. A highly significant (P<0.01) relationship was found between stem number and plant mortality, with herbicide resistance increasing sharply in plants with greatest numbers of stems. This relationship was consistent among all herbicides and plant heights, which suggests that stem number may be useful in selecting the type of control method employed on specific sites.