Javier from Houston writes
Tordon RTU Specialty Herbicide is not labeled to be poured around the base of a tree as a drench. This product can be applied three ways; Tree Injection Treatment, Frill or Girdle Treatment & Stump Treatment.
Tree Injection Treatment: Use 1 milliliter of undiluted Tordon RTU solution through the bark
completely around the tree trunk at intervals of 2 to 3 inches between
edges of the injector wounds. Make injections near ground level when
using the tree injector or 2 to 4 feet above the ground when using a
Hypohatchet Injector or similar device. Treatments can be made in any
season. Maples should not be treated during the spring sap flow. With
some difficult to control species such as dogwood, hickory, sugar maple,
bigleaf maple, tanoak, and some firs, application to a continuous cut
rather than to spaced cuts may be more uniformly effective.
Frill or Girdle Treatment: Make a single hack girdle or "frill" of overlapping ax cuts through the bark
completely around the tree as close to the ground as feasible. Spray or
paint the injured surface with undiluted Tordon RTU, using enough volume
to wet treated areas.
Stump Treatment: Spray or paint the cut surfaces of freshly cut stumps and stubs with
undiluted Tordon RTU. The cambium area next to the bark is the most
vital area to wet.
Answer last updated on: 05/14/2019