Which of the following is NOT a typical use for esters formulations?

Esters formulations are often used in various pesticide applications because of their ability to easily penetrate plant tissues and their effectiveness in specific situations. Injection treatments are typically not a common use for ester formulations. This is because injection methods usually target systemic pesticides that are more effective in their original formulations, such as amines.

In contrast, basal bark treatments, foliar spraying, and soil drenching are common applications for esters due to their favorable characteristics like rapid absorption and efficacy on leaves and bark. Therefore, while ester formulations are versatile, the nature of injection treatments aligns better with different classes of pesticide formulations that are designed for systemic action rather than the characteristics of esters.