Which of the following conditions are less likely to result in pesticide drift?

The correct choice indicates that mild temperatures and high humidity conditions are less likely to result in pesticide drift. This is due to several factors related to environmental conditions affecting how pesticides are applied and their behavior in the air.

When temperatures are mild, the volatility of many pesticides decreases, meaning they are less likely to evaporate into the air. High humidity also contributes to this reduced volatilization, as moisture in the air helps to keep airborne particles heavier and more likely to settle rather than drift away. These conditions reduce the likelihood of particles becoming aerosolized or carried away by wind, thereby minimizing the risk of drift to unintended areas.

In contrast, high temperatures and low humidity can lead to greater volatility of pesticides and a higher risk of drift. Similarly, calm winds help to contain pesticide particles close to the ground, while rainy weather might temporarily settle them but can also lead to runoff, which isn’t categorized as drift.

Mild temperatures combined with high humidity create an environment conducive to proper pesticide application without excessive drift, making this choice the correct one.