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Diquat Dibromide Aquatic Herbicide

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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.

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

Product Q & A

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Browse 20 questions Browse 20 questions and 33 answers
Is it safe for fish
Lynn on Jun 7, 2017
BEST ANSWER: Yes, follow the instructions on the label for proper application to prevent any harm to the fish. Treat a 1/4 of the body of water at a time to prevent a high oxygen depletion.
For killing bladderwort in my pond what is the mix ratio
Tonyboy on May 2, 2016
BEST ANSWER: To kill bladderwort the application rate for diquat will depend on the average depth of the pond. For a pond that averages 4' deep you would use 1 gallon per surface acre. For a pond that averages 8' deep you would use 2 gallons per surface acre. I hope this helps.
Will diquat work well in cold temperature?
A shopper on Mar 14, 2018
BEST ANSWER: " cold" a relative term, but I would wait untilwater temp is at least 60 but not too long after as weeds start really growing after that and you best use it when growth is young.
Pond is used to water livestock. How long after application for duckweed to wait before water source for livestock?
A shopper on Nov 27, 2017
BEST ANSWER: 1 to 3 days based on the rate you apply to the pond, 2 gallon per surface acre rate you will need to wait 3 days.
Can Diquat application have any side effects on cat fishes?
Phenom on Jan 16, 2018
BEST ANSWER: You should check the label to be sure. You can download it on Solution Stores website. Most aquatic herbicides will not hurt fish. I have used it for years in my pond with no problems. I have bass and bluegill. Catfish feed on the bottom so would not be in contact with the herbicide. Just don't over do it and try to kill all your weeds at once.
Does Diquat kill Alligatorweed and if not, what does? I've used Weedtrine D and it stunted the growth for about a month.....waste of time and money.
Kenny C on Jul 24, 2017
BEST ANSWER: Worked well for me. Had a huge infestation covering 1/2 my pond, used as directed with the intake water shut off for 24 hours. Plants all died off in week and decomposed and settled out or floated out the pond outlet within two weeks. Had no loss of aquatic life (fish, frog, salamanders and tadpoles) all doing well.
How much would I use to treat a pond that is 12' X 20' and 2 feet in depth?
A shopper on Feb 13, 2018
BEST ANSWER: The Diquat would need to be mixed at a rate of 0.35 - 0.70 oz per gallon of water for the area that you are treating adding a wetting agent is advised to get the best results.

Will it kill cypress trees?
A shopper on Oct 21, 2017
BEST ANSWER: Diquat would not harm the trees unless drift with wind was an issue and it was allowed to get on the foliage of the trees, but most size trees would have little harm.
I have an ingestion with maya fulvilitis or bog moss. How do I dilute the diquat to spray it on top of water in lake where grass is present? Thanks R French.
Ronald F on Sep 8, 2017
BEST ANSWER: 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.

Broadcast Treatment:
Application Rates: 0.5 to 2.0 gallons Alligare Diquat Herbicide per surface acre in
sufficient spray carrier plus 16 to 32 oz. per acre of an approved aquatic wetting agent.
For duckweed control: Apply Alligare Diquat Herbicide at 1-2 gallons/A.
Application Directions: Apply sprays to ensure thorough target weed coverage.
Repeat applications may be necessary for densely populated weed areas.
Does this kill water hyacinth ?
A shopper on Aug 24, 2017
BEST ANSWER: Yes, Diquat does kill water hyacinth plants in aquatic areas. Spot Treatment:
Application Rates: 2 quarts Alligare Diquat Herbicide per 100 gallons spray carrier
(0.5% solution) plus 0.25-1.0% v/v (1 quart to 1 gallon per 100 gallons water) of an
approved aquatic wetting agent.
For cattail control: Apply Alligare Diquat Herbicide before flowering at 8
quarts of Alligare Diquat Herbicide /100 gallons spray carrier (the maximum
application rate) plus the wetting agent. Make repeat applications if needed for
complete control.
Application Directions: Apply spray solutions to wet completely the target weeds.
Do not spray to runoff. Additional applications may be needed if treating denselypacked
weeds or mats. Best results are obtained for weed escapes if repeat
applications are made within 2 weeks of the first treatmen
How long after treatment can water from pond be used as pottable water?
DebbieDo on Jul 9, 2017
BEST ANSWER: Drinking 3 days after using Diquat Dibromide Aquatic Herbicide
will it kill bamboo
Tomcat on Jun 29, 2017
BEST ANSWER: If the Bamboo is in the water then yes the Diquat will kill the bamboo, allow it to completely die down.
Mike on Jun 24, 2017
BEST ANSWER: I would recommend using https://www.solutionsstores.com/glyphosate-5-4-aquatic-herbicide and surfactant. 3 to 4 weeks and you should start seeing the effects to the water lily.

At a lake where a combination of Aquathol Diaquat Endothall Clipper and Hydrothol 191 was sprayed for shoreline weeds 42 hours prior. Would it be safe for my dog to swim and dive for rocks for exercise?
pet owner on Jun 14, 2017
BEST ANSWER: If the product was applied properly by the directions of the label you will need to wait 24 hours for the dog to be able to get in the water.
I water my lawn from my lake. If I accidentally watered my lawn 1 day after application in my lakewill this kill my grass and ornamentals. Talking about tribune (diquat dibromide).
dim on Jun 10, 2017
BEST ANSWER: Yes, this will kill the ornamentals and more than likely the grass. You need to wait a minimum of 5 days before using that water as irrigation.
Can I use this product in a pondless water feature to kill or spress algae? If so, at what treatment rate? The features holds about 2000 gallons. There are no fish or plants in the feature. It operates from sunup to 10:30 PM.
BillyG on May 22, 2017
BEST ANSWER: Yes, you can use the Diquat in a water feature pond.
What is the mix ratio for spraying coontail in my pond?
Sportsman on May 15, 2017
BEST ANSWER: Bottom Placement: For submersed weeds (ex. Hydrilla, Bladderwort, or Coontail) that have
reached the water surface and/or where the water is slowly moving through the weed growth,
apply Alligare Diquat Herbicide in an invert emulsion carrier with weighted hoses that injects
the diluted spray solution near the bottom. Adding a copper-based algaecide may improve
control. Alternatively, a pretreatment application with a copper based algaecide may improve
overall control if algae are present along with submersed weeds.

Application rate depends on surface size and average depth of the pond, .25 gallons to 1 gallon per surface acre. Please refer to the label for exact pond application.
Will it kill southern Naiad or Bushy Pondweed
Jim on May 2, 2017
BEST ANSWER: Yes, Naiad is listed as one of the controlled weeds on the Diquat label.
Control of Submerged Weeds
Alligare Diquat Herbicide controls the listed submerged weeds from application by surface,
subsurface, and bottom placement applications. Enhanced weed control may be obtained in
situations where severe weed or algae infestations are found: use an approved algaecide
either as a pretreatment to an Alligare Diquat Herbicide application, or as a tank mix with
Alligare Diquat Herbicide.
will this product kill horse hair algea
Scott on Apr 3, 2017
BEST ANSWER: No, you will want to use some type of Copper, Cutrine Granules or a pond dye.


Does diquat kill water meal if not what does?
carrie on Aug 2, 2016
BEST ANSWER: Diquat, and is used at 1 gallon per surface acre. It
is diluted in 50 to 150 gallons of water per acre and sprayed directly on the floating plants. A
nonionic surfactant.
Diquat is a contact herbicide and does
not persist in the water; it is typically gone from the water column by 7 to 10 days after treatment.
Therefore, any plants that survive the initial treatment will start to regrow in a few days. A typical
scenario after treatment with Diquat is that many of the plants will turn brown and sink but the
survivors will regrow and again cover the pond.
Several treatments of Diquat usually have to be made in a single season to keep a pond
relatively free of duckweed or watermeal. Treatments should begin as soon as the plants start to
grow in the spring or early summer in order to �keep ahead� of the growth. It is helpful to treat
when the wind has pushed the plants to one end of the pond; the spray should be concentrated on
the plants in that area. Spray small patches that may still be floating on
other parts of the pond or washed up along the banks.

Customer Reviews

4.8 / 5.0
10 Reviews
5 Stars
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3 Stars
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1 Stars
Works well
Not seen any better and the cheapest Diquat I've found. I will buy this product again for my ponds
September 19, 2017
7 months ago
Works well
Works well. Cleared up our lake in no time.
December 16, 2014
Diquat Dibromide Herbicide
this product was the necessary ingredient to add to fusillade to kill common Bermuda. the two together, with soap, worked! Yeah!
October 7, 2014
Not Sure
We have used the Diquat but after 12 days there is no difference in the algae problem.
May 21, 2014
Product works just as it says in irrigation ditches will use again if needed.
May 22, 2013
We use this in our ponds on the property to control the weeds and it targets exactly what we needed gone.
May 21, 2013
Very easy and ready to use product will keep using as needed.
May 21, 2013
Irrigation pond
I have been using this to keep my irrigation pond from clogging up with algae. Have not had an issue yet.
May 18, 2013
Our company uses this product in all of our ponds on the golf course and it works wonders I would highly recommend this one.
May 13, 2013
This product gives results when applied properly.
May 13, 2013

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