To minimize spray drift and damage to non-target plants, you should:

• A. Apply spray when wind is less than 10 mph
• B. Apply in windy conditions for speed
• C. Use ester formulations
• D. Spray only on sunny days

Answer: (A)

Drift is largely controlled by air movement and droplet size. When the wind is very still—under about 10 mph—the droplets don’t blow far from the target, so they’re less likely to reach non-target plants. That’s why applying under these lighter-wind conditions minimizes spray drift and protects nearby vegetation. In windy conditions, droplets can be carried far beyond the target area, increasing the risk of damage. Ester formulations tend to create finer droplets that stay airborne longer and drift more, so they’re not helpful for reducing drift. Spraying only on sunny days doesn’t address the key factors of drift—wind and droplet behavior—so it’s not a reliable way to prevent damage either.