What method is utilized for treatment through the bark of woody plants?

The method utilized for treatment through the bark of woody plants is known as cut-surface application. This technique involves cutting the bark or the woody stem in some manner to expose the inner layers of the plant to herbicide treatment. By creating a fresh cut on the surface, the herbicide can be more effectively absorbed into the plant's vascular system, allowing it to move throughout the plant and control or kill the target species.

Cut-surface application is particularly useful when dealing with established tree species or woody shrubs that are difficult to control with other methods. It allows for targeted treatment of specific plants while minimizing the impact on surrounding vegetation.

Other methods, such as injection application, involve directly inserting herbicides into the woody tissue but are not focused solely on treatment through the bark in the traditional sense. Surface application typically involves applying herbicides on the surface of the soil or foliage without penetrating the bark. Foliar spray application targets the leaves of plants and is not suitable for woody stems, as it does not effectively treat the bark or inner tissues.