In which of the following situations would invert emulsions be disadvantageous?

Invert emulsions can be disadvantageous in highly turbulent water conditions because their stability relies on the surrounding environment. In turbulent waters, the movement creates agitation that can break down the emulsion. This instability can lead to inadequate control of the intended aquatic pests, as the active ingredients may not be delivered effectively to the target organisms.

In contrast, under windless conditions, or when applying to densely vegetated areas, invert emulsions can actually perform well. These situations allow for more controlled applications and better adherence to surfaces, ensuring that the treatment remains in place. Additionally, targeting specific aquatic life can often be done effectively with the right formulation of emulsions, as these treatments can be designed to minimize impacts on non-target species.