Which of the following is a secondary drift reduction method involving chemical adjuvant?

• A. Increase spray application rate
• B. Use drift reduction adjuvant which increase droplet size
• C. Install pressure monitoring/regulating devices
• D. Use less volatile formulations

Answer: (B)

Drift control through a chemical additive works by changing how the spray behaves in air. A drift reduction adjuvant designed to increase droplet size makes the droplets heavier and less likely to be carried off-target by wind. Larger droplets settle faster and deposit closer to where you intend, reducing off-target drift. This is why using a drift reduction adjuvant that increases droplet size is the best example of a secondary drift reduction method that uses a chemical additive. The other options involve mechanical changes or properties not tied to a chemical adjuvant that enlarges droplets.