Controlling Individual Junipers and Oaks with Pelleted Picloram

Abstract

Applications of pelleted picloram to individual plants of alligator juniper, one-seed juniper, Utah juniper, gambel oak, and shrub live oak in north central Arizona showed that a high rate application, 3.6 g acid equivalent (a.e.) picloram (4-amino-3,5,6-trichloropicolinic acid) per meter of juniper height or meter2 of oak clump crown cover, controlled each of the species. However, only Utah and alligator junipers were consistently controlled by lower rates, 1.8 g a.e. or less per unit of plant height. Regression formulas were developed to determine estimates of the amount of herbicide needed for effective control. Large scale pilot trials were done to expand application of results.