Oklahoma Applicators License Core Practice Exam

What factor influences pesticide movement offsite through the air?

1. Sunlight exposure

2. Temperature changes

3. Droplet or particle size

4. Humidity levels

The correct answer is: Droplet or particle size

Droplet or particle size significantly influences pesticide movement offsite through the air because it directly affects how the pesticide is distributed during application and how likely it is to drift. Smaller droplets and particles can remain airborne longer and travel greater distances due to wind, increasing the risk of off-target movement. Larger droplets tend to fall to the ground more quickly and are less susceptible to air currents, which can help minimize drift. Factors like sunlight exposure, temperature changes, and humidity levels can impact the volatility, evaporation rate, and overall behavior of the pesticide after it has been applied. However, the actual movement of the pesticide through the air is predominantly influenced by the physical characteristics of the pesticide particles themselves. Understanding droplet size is crucial for applicators to effectively manage and mitigate the risk of pesticides moving offsite, ensuring safe and targeted application.