What is a consequence of improper pesticide application in aquatic settings?

Improper pesticide application in aquatic settings can lead to pesticide runoff, which poses a significant risk to non-target species. When pesticides are applied incorrectly, they can easily wash off into nearby water bodies, contaminating the habitat of various aquatic organisms. This contamination can adversely affect fish, amphibians, invertebrates, and even plants, leading to toxicity, disruptions in ecosystems, and potentially long-term ecological damage.

In contrast, the other choices present outcomes that are not typically associated with improper pesticide usage. Enhanced efficacy of pest management is more likely when pesticides are applied correctly and in accordance with recommended practices. Similarly, reduced insect populations, while a goal of pest management, can be achieved only with proper application techniques. An increase in aquatic biodiversity is generally a positive outcome of ecosystem health and stability, which improper pesticide application does not support. Instead, it often leads to a decline in biodiversity due to the harm caused to non-target species and the overall ecological balance.