Which two forms of spray drift are associated with pesticides?

• A. Spray droplet drift and vapor drift
• B. Dust drift and seed drift
• C. Vapor drift and gas drift
• D. None of the above

Answer: (A)

Spray drift from pesticides mainly happens in two ways: spray droplet drift and vapor drift. Spray droplet drift occurs when the fine droplets created during application are carried away by air before they reach the target, especially with small droplets, high wind, or improper nozzle choice. Vapor drift happens when the pesticide evaporates after application and moves as vapors with air currents, which is more likely with volatile products, warm temperatures, or high atmospheric turbulence. Dust drift can occur with older or dry formulations, but the standard forms discussed in this context are the droplet and vapor movements. Gas drift isn’t a distinct term typically used here, since vapor drift already covers the movement of volatilized pesticide through the air.