What method entails inserting small amounts of pesticide into holes drilled in a tree trunk using a plastic septum?

The method that involves inserting small amounts of pesticide into holes drilled in a tree trunk using a plastic septum is microinjection. This technique is specifically designed for delivering precise amounts of chemical treatment directly into the vascular system of the plant, promoting effective dispersal and efficacy of the pesticide. By employing small volumes and targeted application, microinjection minimizes environmental impact and maximizes treatment efficiency.

The use of a plastic septum helps in sealing the delivery site, preventing leakage while allowing the pesticide to be absorbed by the tree. This method is particularly useful for managing pests and diseases in trees where other application methods might be less effective. The precision and control offered by microinjection make it advantageous for treating individual trees with specific needs.