Aquatic herbicides are chemicals specifically formulated for use in water to kill or control aquatic plants. Aquatic herbicides are sprayed directly onto floating or emergent aquatic plants or are applied to the water in either a liquid or pellet form. Aquatic Biologists, Inc. carries only EPA registered herbicides. On average, each of the products we carry has gone through 10 years of research to determine its toxicity level to humans, fish, wildlife, and the environment before being approved by the EPA. Unsure what to use? See our Weed Id Guide, Do-It-Yourself form or call us at 800-442-6648.

There are three different catagories of aquatic herbicides; systemic, contact and selective. Systemic herbicides are capable of killing the entire plant. Contact herbicides cause the parts of the plant in contact with the herbicide to die back, leaving the roots alive and able to regrow. Non-selective, broad spectrum herbicides will generally affect all plants that they come in contact with. Selective herbicides will affect only some plants (often dicots - broad leafed plants like Eurasian watermilfoil (Myriophyllum spicatum) will be affected by selective herbicides whereas monocots like Brazilian elodea (Egeria densa) may not be affected).  Most aquatic plants are monocots.

Aquathol K liquid			Aquathol Super K Granular		Aquastar
Effective against a broad range of aquatic plants, especially pondweeds (curly leaf and sago) and coontail.			Proven control of aquatic plants including curly leaf pondweed.. Excellent for spot treatments, and moving water.		Controls emergent plants in and around aquatic environments. Kills the entire plant; including leaves, roots and stems.
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Copper Sulfate			DMA 4		Habitat
Not recommended for any use as a herbicide or algaecide.			Liquid 2,4-D. Used to control Eurasian Water Milfoil.		For use in sensitive aquatic environments. Effective against species such as cattails, purple loosestrife, and phragmities.
Harpoon			Hydrothol 191 Liquid		Hydrothol 191 Granular
Controls copper sensitive aquatic plant species without restricting water usage. Fast-acting results, typically within 3 - 7 days.			Hydrothol controls many plants including:chara, elodea, hydrilla, milfoil, pond-weeds, spirogyra, and pithophora.		For use around piers and docks to control most weeds and algae. Rapid control. Works well on wild celery and resistant forms of algae.
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Navigate			Renovate Liquid		Renovate OTF
Used to selectively control coonttail, Eurasian water milfoil and other plants. Systemic action ensures complete kill of the entire plant.			Effective on woody plants including purple loosestrife, water willows, cottonwood, poison ivy, water lily, and Eurasian water milfoil.		Provides selective control of specific plant species including Eurasian Water milfoil, water lilies and other "broad leaved" species.
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Reward (Diquat)			Sonar AS		Sonar Q (Quick Release)
Effective against a wide variety of submersed, emergent and floating aquatic plants including cattails, elodea and resistant algae.			Sonar A.S., provides control of aquatic weeds for a year or longer. ABI's #1 product for controlling duckweed and watermeal.		Sonar Q is the fastest releasing Sonar pellet available, providing applicators and pond owners with a quick, easy-to-apply formulation.
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Sonar PR (Precision Release)			Sonar SRP (Slow Release Pellets)		Weedtrine D
Sonar PR provides fast, predictable release of active ingredient allowing precise management of aquatic plants.			Slow dissipation offers an extended period of contact with target plants. Prevent dilution in rapid water while maintaining a high degree of efficacy.		Non-volatile herbicide for use in controlling submersed and floating aquatic plants. usually rapid with effects visible in a few days.
Weedar 64
Liquid 2,4-D, Used to control Eurasian Water Milfoil.