2,4-D belongs to a family of compounds referred to as the phenoxy herbicides. Only products labeled for control of pondweeds can be used legally in ponds. The manufacturer did not renew the aquatic label for simazine products when it expired because of concerns over possible groundwater contamination. Chemicals can change with time and become unsafe to use. Only buy the amount of chemical that you need.
Pesticides are poisons which can cause serious illness or even death.
Placing a pesticide in an unlabeled or mislabeled container could lead to a serious accident. Always follow label instructions. Many aquatic algicides and herbicides are labeled for use by the general public, while others are restricted to certified applicators only. Current listings of certified aquatic plant applicators can be obtained from the MDA office listed above. The blue dyes may be used to reduce nuisance aquatic plant growth in very small lakes and ponds under certain conditions.