Where should treatments begin to avoid flying through spray from previous swaths?

Starting treatments from the downwind side is important to minimize the chances of flying through spray from previous swaths. When aerial applicators begin on the downwind side, they can effectively control and mitigate the potential for drift and exposure to residues from prior applications, as the wind will carry any airborne particles away from the area where new treatments are being applied.

This practice aligns with safe aerial application protocols: starting downwind helps ensure that the applicator is moving into fresher air, avoiding previously sprayed areas that may still contain particles. The applicator can also better monitor the dispersion of the treatment being applied, improving overall effectiveness and environmental safety.

Choosing the upwind side, the center of the area, or over the field boundary would not provide the same level of safety or control over potential exposure to previous applications. Starting on these sides could lead to unwanted cross-contamination and increased drift risks.