Which spray method is commonly used to reduce drift when applying a herbicide with limited crop tolerance?

• A. Broadcast
• B. Basal
• C. Shielded
• D. Foliar

Answer: (C)

Drift control is crucial when applying a herbicide that could injure nearby crops. Shielded spraying uses a spray shield around the nozzle or boom to create a physical barrier that intercepts and deflects droplets, guiding most of the spray onto the target plant and reducing the amount that can drift with the wind. This approach is especially helpful when crop tolerance is limited because it limits off-target contact and injury to adjacent crops while still delivering effective coverage.

Broadcast spraying covers the whole area and tends to produce more drift, especially in windy conditions. Foliar applications target the leaves but often rely on smaller droplets that are more easily carried by air. Basal applications place spray at the base or soil surface and are less about preventing drift over distances and more about reducing exposure to the above-ground parts; they don’t provide the same level of shielding against drift as a dedicated shielded method.