The application of various picloram formulations to cut stumps of brachystegia spiciformis benth. julbernardia globiflora benth. troupin terminalia sericea burch. ex dc and acacia karroo hayne trees
Teague, W.R.; Killilea, D.M.
Journal of the Grassland Society of Southern Africa 7(2): 125-132
Trees were felled 150 mm above ground level and various mixtures of picloram with 2,4-D amine, 2,4,5-T amine in water solution or 2,4,5-T ester in diesel oil were applied to the freshly-cut surfaces. Mixtures of picloram/2,4-D amine and picloram/2,4,5-T amine, both water soluble, gave the highest kill rates when applied to trees in the growing season (October and May). The oil emulsifiable picloram/2,4,5-T ester formulation tended to be effective throughout the year and high kill rates were frequently obtained with applications made in June or July. Application rates of picloram/2,4-D amine or picloram/2,4,5-T amine (expressed as g a.e. picloram per mm girth) required to kill 80% of the trees were 0,012-0,016 for A. karroo; 0,016-0,037 for T. sericea and 0.037 for J. globiflora. Few of the treatments applied to B. spiciformis trees resulted in kill rates of more than 65%.