Winter Injection of 2,4-D and Tordon 101 for Hardwood Control
During the winter of 1965-66, concentrates of Tordon 101 and 2,4-D amine were injected at 1-, 3-, and 5-inch intervals around the stems of southern red oak (Quercus falcata Michx.), sweetgum (Liquidambar styraciflua L.), hickory (Carya spp.), and flowering dogwood (Cornus florida L.). Tordon 101 produced higher mortality than 2,4-D amine in all species, although with hickory the difference may have occurred by chance. Tordon 101 killed over 90 percent of the red oaks and sweetgum at 5-inch spacing and more than 50 percent of the hickory and 40 percent of the dogwood at 3-inch spacing.