Which weather condition should prompt delaying a pesticide spray?

• A. Clear night.
• B. Light breeze.
• C. A slightly overcast day.
• D. Rain is imminent.

Answer: (D)

Rain coming soon should trigger delaying a pesticide spray. When rain is imminent, the spray won’t stay on leaves or soil long enough to work effectively. It can be washed off before pests are contacted, leading to poor control and wasted product. Rain can also cause runoff and off-target movement, risking contamination of waterways and harming non-target organisms. Dry conditions allow the spray to adhere and volatilize or be absorbed as intended, so postponing until after the rain helps ensure the label’s performance and environmental safety. Other conditions like a light breeze or a clear night don’t pose the same immediate risk of washing the product away, though wind can cause drift and should still be considered.