Which of the following is NOT advisable during a pesticide application?

In the context of pesticide application, effective communication between the aerial applicator and the ground crew is crucial for safety and efficiency. Avoiding communication with the ground crew can lead to misunderstandings regarding the operation, potential hazards, and the presence of individuals or obstacles in or near the application area.

Maintaining open lines of communication ensures that all parties are aware of the application process and can respond appropriately if any issues arise, thus reducing the risk of accidents. The other actions mentioned—ensuring no one is present below the flight path, using appropriate personal protective equipment, and following instructions from regulatory agencies—are all best practices that enhance safety during pesticide applications.