Sonar AS Aquatic Herbicide is a professional-grade systemic aquatic herbicide trusted for long-term selective control of invasive aquatic weeds in lakes, ponds, reservoirs, irrigation canals, and other freshwater systems. Powered by fluridone, Sonar AS provides season-long or year-long control of many troublesome aquatic weeds with a single application, making it one of the most effective and economical aquatic vegetation management solutions available. Widely recognized as the industry standard for duckweed control, Sonar AS slowly disrupts carotenoid production in susceptible aquatic plants, leading to gradual bleaching and plant death while minimizing oxygen depletion and water quality disruption often associated with rapid vegetation collapse. Sonar is highly effective on duckweed, hydrilla, coontail, Eurasian watermilfoil, bladderwort, and other labeled submerged and floating aquatic weeds. Unlike many aquatic herbicides, Sonar AS has minimal restrictions on recreational water use following application. Swimming, fishing, and livestock watering may continue according to label directions, though irrigation restrictions may apply for certain sites and crops. Developed by SePRO, a recognized leader in aquatic plant management, Sonar AS has been trusted by professional aquatic applicators and lake managers throughout the United States for decades.

Features & Benefits

✅ Professional aquatic herbicide for long-term weed control
✅ Provides season-long or year-long control with a single treatment
✅ Industry-leading control of duckweed and other floating weeds
✅ Selective systemic activity with gradual plant control
✅ Controls hydrilla, coontail, milfoil, bladderwort, and other aquatic weeds
✅ Helps minimize oxygen depletion from rapid vegetation die-off
✅ Ideal for lakes, ponds, reservoirs, and irrigation canals
✅ No swimming, fishing, or livestock watering restrictions after application when used according to label directions
✅ Trusted by professional aquatic applicators nationwide

Use Sites

Lakes, ponds, reservoirs, irrigation canals, drainage canals, freshwater impoundments, golf course ponds, ornamental ponds, and other labeled freshwater aquatic sites.

Target Weeds

Duckweed, hydrilla, Eurasian watermilfoil, coontail, bladderwort, elodea, watermeal, fanwort, and other labeled aquatic weeds.

Application Notes

Sonar AS works slowly and may require several weeks for complete weed control depending on water temperature, weed species, and concentration levels. Maintaining proper fluridone concentration over time is critical for optimum performance. Follow all irrigation restrictions and site-specific label directions when treating water bodies used for irrigation.

Product Information

Active Ingredient: Fluridone
HRAC Group: Group 12 Herbicide
Formulation: Aquatic Suspension Concentrate
Herbicide Type: Systemic Aquatic Herbicide
Manufacturer: SePRO Corporation