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Ultra PondWeed Defense | Aquatic Herbicide

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  • Treats a wide variety of submerged, floating, emergent aquatic weeds, including Duckweed, Cattail, Hydrilla, Watermilfoil, etc.
  • Fast-acting contact herbicide; effects visible in under 48 hours.
  • Treats up to 5,000 sq. ft. per quart (32 oz.)
  • Designed to be applied with a pressure sprayer after mixed with water
  • Only treat from 1/3 up to 1/2 of a water body at one time. Wait 14 days between treatments.
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Due to state and local regulations, we cannot ship this product to AK, AZ, CA, CT, DC, HI, ME, NJ, NY, PR, RI, VT, WA and Internationally.

$62.49 - $149.99

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Pond Logic Ultra PondWeed Defense works on submerged, floating and emergent pond weeds. Use it all season on actively growing weeds for the best results. It must not be used in commercial fish processing areas.


Ultra PondWeed Defense may be used for short-term control of duckweed and watermeal in slow moving water. It also works on water lettuce, water hyacinth, Salvinia species, pennywort, frog's bit, cattails, bladderwort, hydrilla, watermilfoils, pondweeds, coontail, Elodea species, Brazilian elodea and naiad. Also, it suppresses Spirogyra and Pithophora algae.


Application Directions

  1. Refer to the table below, and mix Ultra PondWeed Defense with water in a pressurized sprayer.
  2. Spray the mixture directly on target weeds while they are actively growing and when the wind is calm. For submersed weeds, apply when the water temperature is above 50 degrees Fahrenheit.
  3. Treat only 1/3 to 1/2 of the pond at a time because dying weeds reduce oxygen in water, endangering fish and non-target plants.
  4. Wait 14 days between treatments.
  5. Cut and rake dead weeds from the pond.
  6. Please Note: Best results are obtained when Ultra PondWeed Defense is mixed with a spreader sticker (such as Airmax Treatment Booster) because it improves herbicide adhesion on the target weeds.

Ultra PondWeed Defense Dosage Rates

Treatment AreaUltra PondWeed DefenseWater Needed for Mixing
2,500 square feet >16 ounces 1.5 gallons
5,000 square feet 32 ounces 3 gallons
10,000 square feet 64 ounces 6 gallons
20,000 square feet 124 ounces 12 gallons

Water Use Restrictions: 3 day waiting period after treatment for human drinking, 1 day waiting period for livestock/domestic animal consumption, 5 day waiting period for irrigation.