Which factor is not typically recorded in a weather log for pesticide application?

• A. Wind speed
• B. Humidity
• C. Soil moisture
• D. Temperature

Answer: (C)

Weather logs are meant to capture atmospheric conditions at the time of application because these factors directly affect how a pesticide behaves in the air—drift, evaporation, and overall effectiveness. Wind speed helps estimate how far droplets may travel; temperature and humidity influence evaporation and volatilization; knowing these helps determine drift risk and proper timing. Soil moisture, on the other hand, is a condition of the soil itself, not the air, so it isn’t part of a standard weather log. It’s important for other decisions, like irrigation or root zone conditions, but it doesn’t describe the weather at the moment of application.