Why should applications be avoided during windy conditions or rain?

• A. Wind increases drift; rain can wash away pesticide and reduce efficacy and safety.
• B. Wind helps distribute pesticide evenly; rain improves adhesion.
• C. Weather has no impact on pesticide performance.
• D. Wind and rain only affect odor, not effectiveness.

Answer: (D)

Weather affects how pesticides behave after application. Wind pushes droplets off target, causing drift that wastes product and can expose people, pets, or non-target organisms. It also makes how the chemical settles uneven, so the pest may not receive the intended dose. Rain can wash the product away from the treated surfaces, dilute it, and cause runoff, which lowers effectiveness and can increase environmental risks. Because deposition, persistence, and exposure all depend on weather, avoid applying during windy conditions or rain to keep the treatment effective and safe. The other ideas aren’t correct: wind won’t distribute evenly, rain won’t improve adhesion, weather does impact performance, and odor isn’t the sole concern.