Few applications are refused. Applicants will receive useful advice in the process, including any changes in approved chemicals and water use restrictions, safe methods for chemical application and requirements for posting signs. There is no fee for a permit if the pond or lake is under single ownership. If ponds or lakes are owned by two or more households, the permit fee is based on the size of the treatment area. Generally, late spring or early summer is the best time to apply herbicides.
Plants are in a period of rapid growth and highly susceptible to herbicide treatment.
However, always follow the label instructions for best results. Algicides and herbicides approved for aquatic use and the plants they control are listed in Appendix 1. This listing should be used for preliminary planning only since chemical approvals for aquatic use may change. Dosage rates are listed on the label. General application rate recommendations cannot be made since chemicals may be sold with different levels of active ingredient or with different active forms.