When should a cut-stump application of herbicide be performed?

A cut-stump application of herbicide is most effective when performed within 24 hours of cutting the tree. This timing is critical because the herbicide needs to be absorbed by the cambial layer to effectively prevent regrowth. Immediately after cutting, the vascular system of the tree is still active, allowing the herbicide to move throughout the plant more effectively.

Applying herbicide after this critical window may result in reduced efficacy because the tree's internal processes begin to slow down and the cut surface may start to dry out, making it less susceptible to herbicide uptake. Moreover, when trees are in full leaf, or especially when they have dried out, the chances of successful herbicide absorption diminish significantly. Winter applications can also be ineffective due to the dormant state of the trees, further complicating the likelihood of successful treatment. Therefore, timing the application within 24 hours of cutting is key to ensuring that the plan is robust and that the herbicide has the best chance of being absorbed and acting on the targeted vegetation.