What is a disadvantage of ULV application compared to conventional sprays?

The choice that identifies a disadvantage of ULV (Ultra Low Volume) application compared to conventional sprays is the third option, which highlights the poor residual life and the risks of overspray.

ULV application utilizes very small droplet sizes that allow for effective coverage and penetration, particularly in areas that are difficult to reach. However, this very feature can lead to a shorter residual effect on surfaces when compared to conventional sprays, which often provide a longer-lasting impact due to larger droplet sizes and heavier application rates that create a thicker layer of the pesticide. Additionally, the fine droplets produced in ULV applications are more susceptible to being carried away by wind or air currents, increasing the potential for overspray, where the pesticide drifts from the intended application area, leading to unintended exposure risks.

The other options highlight characteristics that are often associated with ULV applications but do not denote disadvantages. ULV formulations can indeed have excellent residual life under certain conditions or in specific formulations, and they may perform efficiently in ventilated areas. Furthermore, while ULV applications may require less protective equipment than some conventional methods, it is important to note that protective measures are still generally recommended for safety, depending on the specific pesticide being used. Thus, focusing on both the reduced residual