What is a disadvantage of wettable powders?

The chosen answer correctly identifies a notable disadvantage of wettable powders, which is their requirement for constant tank agitation during mixing and application. This necessity arises because wettable powders do not dissolve readily in water; instead, they remain suspended as fine particles. If agitation is not maintained, these particles can settle at the bottom of the tank, leading to uneven distribution and potentially ineffective application of the pesticide.

Consistent agitation ensures that the active ingredients stay evenly distributed throughout the liquid, maximizing the effectiveness of the treatment. Without proper agitation, there is a significant risk that some areas might receive too little of the herbicide, reducing overall efficacy and possibly leading to inadequate control of target aquatic vegetation.

In contrast, while other options present certain considerations, they do not encapsulate the specific operational challenge presented by wettable powders like the need for continuous agitation does. This characteristic can be particularly critical in aquatic applications, where maintaining the integrity of the mix is essential for achieving timely and effective results.