Tree Killing Treatments :
Good news is, you can chemically treat and kill trees in an environmentally safe way if you follow the chemical label recommendations. Some treatments apply herbicide to a specific area on the tree. These applications will reduce impacts on adjacent vegetation from drift or overspray. But other methods require complete herbicide coverage on foliage or soil - a bit more complicated.
Here are the most effective available chemical methods used to kill trees.
Cut Surface Treatments :
Basal Bark Treatments:
Important Tips to Remember:
Remember - call your local Cooperative Extension Service for detailed chemical information pertaining to any chemical treatments used. You are responsible for the chemicals you use and their ultimate effects.
Remember - plants use suberizationas a natural healing process. Suberization occurs by adding a layer of protective "corky" cells over the damaged tissue. These cells can reduce herbicide effectiveness by preventing absorption. When using frilling or cut stump methods of treatment, apply the herbicide immediately to achieve maximum absorption.
Remember - roots of plants can share vascular tissue through root grafting. Root grafting occurs primarily within the same species but may occur between plants within the same genus. Your herbicide can move from a treated tree to an untreated tree, killing or injuring it.
Remember - once the herbicide is released from a tree, it can be available for uptake by another. This is called flashback. The serious consequence of this is that a treated tree may release herbicide back into the environment, injuring other nearby trees and vegetation.
Remember - adding stains or dyes to the herbicide solution substantially increases applicator accuracy. Applicators use the dyes to monitor treated trees, so they are less likely to miss or respray targeted trees. Use of stains can also indicate personal exposure.
Remember - dripline is the area directly underneath the tree canopy. Herbicide labels frequently caution against making applications within the dripline of desirable trees. But tree roots often extend well beyond the dripline. Use the rule-of-thumb that tree roots extend a distance equal to the height of a tree growing east of the Cascades, and equal to half of the height for a tree growing west of the Cascades.
Remember - you can control weed-trees without using chemicals. See: Kill Trees Without Chemicals