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Target Pests

Diquat is used as a pond weed killer pond algae treatment and to kill lake weeds such as water lettuce duckweed salvinia pennywort frog's bit cattails bladderwort hydrilla watermilfoils pondweeds coontail elodea naiad algae little barley annual bluegrass rescuegrass fescue henbit buttercup and carolina geranium.

For Use In

Diquat Herbicide is for weed/algae control in and around ponds lakes commercial greenhouses and nurseries landscapes industrial land recreational land residential lawns and public areas.


Diquat weed killer can be used in two different ways. It can be applied directly to bodies of water to control pond and lake weeds over large areas or it can be mixed up and applied as a spot treatment spray directly on the vegetation. 

For treatment of pond and lake weeds and algae, use at a rate of 1 gallon of Diquat per surface acre of water. This is assuming a 4' depth. For pond or lakes at a 8' avg depth you will use 1 gallon of diquat per 1/2 surface acre of water. Water restrictions do apply with Diquat Herbicide except for fishing and swimming. After treating with diquat you will not want to irrigate with that water for 1-4 months or until the level of diquat drops below 100ppb.

For spot treatment applications of Diquat to treat for weeds around ponds or in turf grasses then mix 1 ounce of diquat with one gallon of water and that will treat approximately 1000 square feet.

Coverage Area

Each gallon of Diquat will treat up to 1 surface acre lake. For land applications each gallon of diquat will treat 2-3 acres.

Time to Kill

Diquat Herbicide begins to eliminate unwanted weeds within turf just after application but can take up to several weeks to completely kill of the target weeds.

Country of Manufacture

United States

Mix Rate

Diquat should be mixed at a rate of 1 gallon per surface acre (4' depth) or mixed at 32ounces per 100 gallons when spraying as a commercial weed killer.

Active Ingredient

Diquat Dibromide 37.3%

Diquat Dibromide Aquatic Herbicide

Diquat is an industrial weed killer to control pond weed, pond algae, and other aquatic weeds. We carry Alligare Diquat which is a generic of Reward Herbicide and much more cost effective. Diquat is a weed killer concentrate that needs to be mixed with water before application. You will not find a safer aquatic herbicide to kill pond weeds and algae.

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will this product kill horse hair algea
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Customer Reviews

  • Diquat Dibromide Aquatic Herbicide
    By Frank B. on 12/16/2014
    Works well. Cleared up our lake in no time.


  • Diquat Dibromide Aquatic Herbicide
    By Mary Anna Raburn on 10/7/2014
    this product was the necessary ingredient to add to fusillade to kill common Bermuda. the two together, with soap, worked! Yeah!


  • Diquat Dibromide Aquatic Herbicide
    By Roger Connelly on 5/21/2014
    We have used the Diquat but after 12 days there is no difference in the algae problem.


  • Diquat Dibromide Aquatic Herbicide
    By on 5/22/2013
    Product works just as it says in irrigation ditches will use again if needed.


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