Which of the following is a drawback of flowables in pesticide formulations?

The identification of leaving behind residue as a drawback of flowables in pesticide formulations is accurate because flowable formulations typically consist of fine pesticide particles suspended in a liquid. While they can provide effective delivery of the active ingredients, after application, they often result in a film or layer of residue on the treated surfaces. This residue can be problematic for several reasons.

Firstly, it can pose a risk to non-target organisms or the environment, as the active ingredients may persist longer on surfaces than intended. Secondly, any residual film may affect the aesthetics of the treated area or even simplify cleaning processes, potentially resulting in unwanted exposures. Furthermore, the residual effects can influence subsequent pest management strategies, as they may interfere with the effectiveness of other products applied later.

Though handling, application difficulty, the need for constant stirring, or effectiveness compared to solid formulations are important considerations in pesticide use, the characteristic of leaving behind a residue is particularly significant because it directly impacts safety, efficacy, and environmental implications in pest control practices.