What must be avoided when considering Basal Bark Treatment for herbicide application?

Answer

Treating trees with thick or mature bark

Basal Bark Treatment is only desirable for trees with desirable bark characteristics, specifically bark that is not too thick or mature, as the oil carrier needs to penetrate the layer effectively.

What must be avoided when considering Basal Bark Treatment for herbicide application?
plantmethoderadicationcontroltree of heaven