Injection of Hardwoods with Dicamba, Picloram, and 2, 4-D

Two relatively new herbicides for timber stand improvement, 4-amino-3, 5, 6-trichloropicolinic acid (picloram) and 2-methoxy-3,6-dichlorobenzoic acid (dicamba), killed the more resistant species of cull hardwoods in Virginia adequately and, in several cases, more effectively than dimethylamine salt of 2, 4-dichlorophenoxy acetic acid (2, 4-D) alone. Spaced injections of these herbicides were made with a standard metered injector during four stages of the annual growth cycle.