Which factor has no effect on off-target pesticide drift?

The factor that has no effect on off-target pesticide drift is a constant wind speed of 3 mph. Off-target drift occurs when pesticide particles are carried away from the intended application site by environmental factors.

A consistent wind speed, such as 3 mph, serves as a controlled condition that does not contribute to variability in spray movement. In contrast, changes in wind speed can significantly influence the direction and distance that pesticide particles travel.

Temperature and humidity also play important roles in drift. Higher temperatures can increase evaporation rates of pesticides, potentially resulting in more drift if the particles become airborne. Additionally, humidity levels can affect the size of droplets, where lower humidity may lead to smaller droplets that can drift more easily.

Therefore, the selection of a constant wind speed like 3 mph signifies a stable factor that, in this context, does not directly influence the potential for off-target drift. It is a baseline condition, while the other factors are dynamic and have varying impacts on drift behavior.