Which method involves introducing a large quantity of pesticide solution into holes drilled into a tree trunk?

The method that involves introducing a large quantity of pesticide solution into holes drilled into a tree trunk is known as macroinfusion. This technique is utilized to combat various pests or diseases affecting trees. In macroinfusion, larger volumes of pesticide are injected directly into the tree to ensure that the chemical permeates throughout the vascular system of the tree effectively.

This method is particularly advantageous for treating large trees or severe infestations because it allows for a higher concentration of the pesticide to be delivered where it is needed most. By drilling holes at strategic points in the trunk, the pesticide can be distributed in a way that maximizes its absorption and effectiveness.

Microinjection, while similar, typically involves smaller quantities of pesticide and is often used for more targeted applications rather than treating the entire tree. Other methods like drip irrigation and soil injection are distinctly different in their application techniques and target areas, as they focus on delivering pesticides through the soil or around the plant's root zone rather than directly into the tree trunk.