What wind speed threshold should trigger discontinuing spraying to reduce drift?

What wind speed threshold should trigger discontinuing spraying to reduce drift?

• A. 7 mph
• B. 14 mph
• C. 28 mph
• D. 4 mph

Answer: (A)

Wind speed directly influences how far spray droplets travel. As wind builds, drift off-target becomes more likely, so a practical rule is to stop spraying when wind reaches about seven miles per hour. At this level, the drift risk becomes significant enough to compromise nearby crops, people, and other surroundings, making continuation unsafe or inefficient. A wind as low as four miles per hour is typically calm enough to spray with minimal drift, while winds of fourteen or twenty-eight miles per hour greatly increase drift, so stopping well before those levels is prudent.

Wind speed directly influences how far spray droplets travel. As wind builds, drift off-target becomes more likely, so a practical rule is to stop spraying when wind reaches about seven miles per hour. At this level, the drift risk becomes significant enough to compromise nearby crops, people, and other surroundings, making continuation unsafe or inefficient. A wind as low as four miles per hour is typically calm enough to spray with minimal drift, while winds of fourteen or twenty-eight miles per hour greatly increase drift, so stopping well before those levels is prudent.