Which formulation type leaves considerable residue after application?

Wettable powders are designed to be dispersed in water and form a suspension, which allows for effective application over an area. However, after application, these formulations often leave visible residues on surfaces due to their particulate nature. The solids do not fully dissolve, leading to some remaining on the foliage, soil, or other surfaces after the water evaporates.

In contrast, emulsifiable concentrates and solutions typically form a homogeneous mixture in water and are less likely to leave significant residues once dried. Granules, while they may leave some residue, are primarily designed for slow release and do not behave like wettable powders in terms of suspension and visibility on surfaces. Therefore, wettable powders are distinguished by their residual characteristics post-application, making them the correct choice in this context.