Apply a 25 percent solution of glyphosate mixed with water to cut stumps or girdle wounds. If cutting is not feasible and the tree is less than six inches in diameter, herbicide may be applied to the lower trunk. From late winter to late summer, a solution of 20 percent triclopyr (such as Garlon® 4) mixed in oil may be applied in a 12-inch band around the base of the tree. Foliar applications of 2 percent glyphosate mixed with water may be considered in areas where the risk to non-target species is minimal.