How does droplet size influence both coverage and drift risk?

• A. Droplet size has no effect on drift.
• B. Finer droplets improve coverage but increase drift risk; coarser droplets reduce drift but may reduce coverage; follow label guidance.
• C. Coarser droplets improve coverage.
• D. Finer droplets always reduce drift.

Answer: (B)

Droplet size creates a practical trade-off between getting good coverage on the target and limiting off-target movement. Smaller, finer droplets wet surfaces more thoroughly and can reach tiny or underside areas of leaves, giving better overall coverage. But their light weight makes them easy to carry by wind and they evaporate more quickly, which increases drift risk and the chance of off-target deposition. Larger, coarser droplets stay local more often and are less likely to drift, but they don’t cover as uniformly and can miss fine leaf surfaces or runoff, reducing effective coverage. Following the label guidance helps balance these factors for the specific product, crop, and conditions.