Which method involves injecting pesticide into the soil under pressure?

Soil injection is a method that involves the application of pesticides directly into the soil under pressure. This technique is particularly useful for managing soil-borne pests and diseases because it delivers the pesticide deep into the root zone, where it can be most effective. By injecting the pesticide into the soil, it minimizes exposure to non-target organisms and reduces potential drift, ensuring that the chemical reaches its intended location more efficiently.

Other methods listed, such as bark spray, basal spray, and foliar spray, involve applying pesticides onto plant surfaces or specific parts of the plant rather than directly into the soil. These methods are more suited to targeting pests that affect the foliage or bark but do not address soil-level pests or issues in the same way that soil injection does.