QAL Laws & Regulation Practice Exam

Which application equipment creates the least amount of pesticide drift?

1. A backpack sprayer with one nozzle

2. A boom sprayer with 14 nozzles

3. A rope wick

4. A high pressure hand spray gun

The correct answer is: A rope wick

The rope wick application equipment is designed to minimize pesticide drift significantly compared to other methods. It works by allowing the pesticide solution to be delivered directly onto the plant surfaces through wicking action, which means that the pesticide is applied where it is needed most, such as along the foliage of target plants or weeds. This targeted application drastically reduces the chances of airborne drift, as the liquid does not become airborne like it might when using a sprayer, which creates a mist that can travel away from the intended application area. In contrast, other application methods, such as a boom sprayer or high-pressure hand spray guns, can produce fine droplets that are more susceptible to wind, leading to increased drift. A backpack sprayer with multiple nozzles can also create drift through similar mechanisms of aerosolization. The rope wick's design, therefore, inherently supports a more controlled and localized application of pesticides, providing greater efficacy and safety for surrounding areas.