What is a disadvantage of granular formulations?

The correct choice highlights that a significant drawback of granular formulations is the need to handle a large quantity for application. This aspect can be particularly important in aquatic pest control, where achieving the desired concentration of the active ingredient in the water body is essential for effectiveness.

Granular formulations often require the user to apply a substantial volume to ensure adequate coverage and impact on pest populations. This can lead to difficulties in transport, manipulation, and even increase the potential for user error or inconsistent application. Additionally, handling large quantities may elevate safety risks and challenges, such as ensuring user compliance with safety guidelines and regulations regarding personal protective equipment.

In contrast, the other options do not address key characteristics of granular formulations in the same relevant way. Limitations in effective range, complexity in application processes, and costs, while potentially valid concerns in different contexts, do not capture the overarching issue of large quantity handling that directly impacts both safety and effectiveness during the pest control process.