Which two factors are most important in avoiding vapor drift?

Which two factors are most important in avoiding vapor drift?

• A. Droplet size and wind speed.
• B. Air stability and temperature.
• C. Temperature and pesticide volatility.
• D. Humidity and soil type.

Answer: (C)

Vapor drift is driven by how easily a pesticide becomes a gas and how much heat drives that vaporization. The two most important factors are the product’s volatility and the ambient temperature. A pesticide with high volatility will vaporize more readily, and higher temperatures raise vapor pressure, increasing the amount of pesticide that turns into vapor and moves with the air. So, choosing a formulation with lower volatility and applying under cooler conditions are the best ways to minimize vapor drift. Factors like droplet size and wind speed mainly affect spray drift of liquid droplets, not the vapor phase, while humidity and soil type influence deposition and absorption rather than how much pesticide becomes vapor.

Vapor drift is driven by how easily a pesticide becomes a gas and how much heat drives that vaporization. The two most important factors are the product’s volatility and the ambient temperature. A pesticide with high volatility will vaporize more readily, and higher temperatures raise vapor pressure, increasing the amount of pesticide that turns into vapor and moves with the air. So, choosing a formulation with lower volatility and applying under cooler conditions are the best ways to minimize vapor drift.

Factors like droplet size and wind speed mainly affect spray drift of liquid droplets, not the vapor phase, while humidity and soil type influence deposition and absorption rather than how much pesticide becomes vapor.