What is the primary weather factor influencing drift during spraying?

Wind is the primary weather factor influencing drift during spraying because it can easily transport small droplets of herbicide away from the target area. During application, the wind can carry these droplets for considerable distances, potentially affecting non-target plants, water sources, and sensitive areas.

High wind speeds can lead to increased rates of drift, which can compromise the effectiveness of the herbicide application and lead to unintended consequences. Even moderate winds can disperse droplets, especially those that are smaller, making it crucial for applicators to check wind conditions prior to spraying.

While temperature, humidity, and rainfall can influence other aspects of herbicide behavior, such as evaporation rates or efficacy on target plants, it is the wind that has the most direct and immediate effect on the physical movement of the spray particles through the air. This makes understanding wind patterns and speeds essential for safe and effective herbicide application.