What external factor should be monitored to reduce drift during pesticide application?

Monitoring wind speed and direction is crucial during pesticide application because wind can significantly affect the dispersion and drift of airborne chemicals. When pesticides are sprayed, any wind can carry the particles away from the targeted area, potentially affecting non-target plants, animals, and even water sources nearby. By keeping an eye on these wind conditions, applicators can adjust their timing and techniques to minimize unintended consequences, ensuring that the pesticides are applied effectively and safely.

In contrast, while soil pH levels can influence pesticide effectiveness in the soil, they do not directly relate to drift during application. Similarly, understanding wind variable patterns may provide some insight into local wind behavior but is less direct than monitoring specific wind speed and direction. Amount of sunlight does not impact drift; its relevance is more tied to the efficacy of pesticide absorption and breakdown rather than the physical movement of the spray.