What is a potential consequence of applying too much herbicide?

Applying too much herbicide can lead to potential toxicity to fish. Herbicides are chemical substances designed to control unwanted plant growth, but excessive application can create high concentrations of these chemicals in the aquatic environment. This can disrupt the delicate balance of the ecosystem and harm aquatic life, particularly fish. Fish are sensitive to changes in their environment, including the presence of chemicals, which can lead to physiological stress, reduced reproduction, and even mortality.

In contrast, while poor vegetation control, illegal activity, and higher operational costs are factors to consider in herbicide application, they do not directly relate to the immediate and critical impact of toxicity to fish. The ecological consequences highlight the necessity of following recommended application rates and understanding the implications of chemical usage in aquatic systems.