Which two factors are most important in avoiding vapor drift?

Temperature and pesticide volatility are critical factors in avoiding vapor drift because they directly influence how a pesticide behaves after application. When temperatures are high, the volatility of certain pesticides tends to increase, which means they can easily change from a liquid to a vapor state. This vapor can then be carried away by air movement, leading to unintended drift onto non-target areas.

Additionally, the volatility of a pesticide is determined by its chemical properties. Pesticides with higher volatility are more likely to evaporate into the air under suitable temperature conditions. By understanding and monitoring temperature and the specific volatility characteristics of the pesticides being used, applicators can implement strategies to mitigate the risk of drift, such as timing applications for cooler parts of the day or selecting less volatile formulations. This understanding is essential for responsible pesticide use, ensuring effectiveness while minimizing environmental impact and risks to human health.