What restriction must be followed when applying aquatic herbicides?

Aquatic herbicides are regulated substances, and one of the most critical considerations when applying them is adherence to the product label safety requirements. The product label provides essential information regarding the herbicide's safe use, including application rates, methods, target areas, timing, and any necessary protective equipment. Following these guidelines ensures not only the effectiveness of the herbicide but also the safety of the applicator, the public, and the surrounding environment.

Labels often contain vital instructions such as waiting periods between applications, how to mitigate drift, and specific instructions concerning fish and wildlife impacts. By adhering strictly to these safety requirements, individuals can minimize the risk of harm to non-target species and water quality, complying with regulatory standards to protect aquatic ecosystems.

In regard to the other choices, applying only on weekdays, after sunset, or encouraging public swimming does not align with best practices or regulations for the application of aquatic herbicides, thus emphasizing the importance of following the specific guidelines outlined on the product label.