What factor does NOT affect the direction and distance of spray drift?

The direction and distance of spray drift are significantly influenced by various factors in pesticide application. Weather conditions, such as wind speed and direction, temperature, and humidity, can greatly affect how far and where spray particles move after application, potentially carrying them away from the targeted area.

Application technique also plays a crucial role. The method of spraying—such as the nozzle type, droplet size, and pressure—can determine how effectively the pesticide is delivered to the intended site while minimizing drift.

Time of day can impact temperature and humidity levels, which in turn can influence evaporation rates and volatility of the pesticide, further affecting drift.

However, while the type of pesticide can have attributes that might influence its volatility or adherence to surfaces, it does not directly affect the physical dynamics of drift like the other factors do. Therefore, it is the least relevant in determining the direction and distance of spray drift compared to the influences of weather, application techniques, and timing.