To minimize drift, volatile pesticides should not be applied when temperatures are at or above 75°F.

• A. False
• B. True
• C. Only in morning
• D. Only with wind

Answer: (B)

Temperature affects volatilization and drift: when it’s warmer, volatile pesticides evaporate more quickly, and the resulting vapor can be carried off-target by air currents. At or above 75°F, this evaporation increases enough that drift risk rises, so avoiding application at these temperatures helps keep the product where it’s intended. Applying during cooler conditions reduces volatilization and makes drift less likely, which is why this guideline is considered the best practice. The other options don’t align with the main mechanism—either ignoring temperature’s effect or suggesting conditions that would not reduce drift (for example, wind generally increases drift).