How can weather affect pesticide efficacy and safety?

• A. Weather has no impact on efficacy
• B. Wind alone determines drift
• C. Rain always improves longevity
• D. Temperature, wind, and rain can reduce efficacy, increase drift, and shorten product longevity

Answer: (D)

Weather plays a big role in how pesticides perform and how safe they are to use. Temperature affects how quickly a product breaks down or evaporates, so hot conditions can shorten how long the chemical stays active on targets, while cooler conditions may slow degradation and extend lingering effects. Wind drives spray drift—even a light breeze can blow droplets away from the target, increasing exposure to bystanders and non-target areas and reducing the amount that actually reaches pests. Rain can wash the product off surfaces or dilute it, lowering efficacy and raising the risk of runoff into water sources. Put together, temperature, wind, and rain influence how well the pesticide works, how far it can drift, and how long it lasts, which is why all three factors matter for efficacy and safety.