What is one of the main disadvantages of granules (G) in formulation?

One of the main disadvantages of granules in formulation is that they may have a shorter residual life during heavy rain. Granular pesticides rely on environmental conditions for their effectiveness, particularly moisture for activation. When heavy rain occurs, it can lead to leaching, where the active ingredients wash away from the intended treatment area, reducing their effectiveness over time. This can significantly impact pest control outcomes, as the chemicals may not remain in the soil or on surfaces long enough to affect the target pests.

In contrast, while granules do not provide immediate pest control, require some moisture to activate, and can be applied with less specialized equipment compared to other formulations, these characteristics do not inherently disadvantage their overall efficacy as much as their susceptibility to rain does. Thus, the decreased residual effectiveness during periods of heavy rainfall is a critical aspect to consider when using granular formulations.