Which conditions contribute most to pesticide spray drift?

Study for the Idaho Pesticide Training Test. Prepare with detailed questions and explanations. Ace your exam now!

Spray drift is primarily influenced by the size of the spray nozzle or orifice and the pressure applied during application. When using a small orifice at high pressure, the droplets created can be very fine. These fine droplets are more susceptible to being carried off target by wind and other air currents, leading to increased potential for drift.

In contrast, larger droplets produced by a larger orifice or lower pressure are less prone to drift, as they tend to fall more quickly and are less affected by environmental factors. Therefore, the combination of a small orifice and high pressure is particularly conducive to drift because it maximizes the formation of smaller droplets that can travel further distances before settling. Understanding this dynamic is critical for ensuring effective and environmentally responsible pesticide application, as minimizing drift is essential to protect neighboring crops, wildlife, and human health.

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