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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.

Application

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 herbicide effectively controls a wide variety of submerged weeds such as milfoil and hydrilla. Suitable for treating small areas, such as around a dock or swimming area.

 

Diquat herbicide is quickly absorbed by submerged plants like milfoil and hydrilla, allowing for aquatic weed control to be obtained in small areas of large water bodies. Completely safe with no fishing or swimming restrictions.

 

Suggested Items To Add To Your Cart

Vision Pond Dye

 

Solutions 1 Gallon Pump Sprayer


Homeowner Chemical Safety Kit

 

 

Product Q & A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 37 questions Browse 37 questions and 63 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.
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
We have dandelions in the lawn, under an old ash tree. Diquat has been recommended as a contact herbicide. Is this a good application ?
A shopper on Apr 27, 2018
BEST ANSWER: Diquat is a defoliant. Defoliants per se don’t kill the plant and is not systemic. It merely deprives it of its leaves for a while. Diquat application would have the same results as merely grabbing the plant and breaking it off at the root. We know what happens with that. A better solution would be to spray the offending weed with an appropriate pesticide such as Ortho Weed B Gon or any systemic broadleaf weed killer.Enter an answer to this question.
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.
What is the mixing ratio for a pump sprayer for treatment along shoreline? Water is <2' deep. Thanks for the assistance.
Jim R on May 17, 2018
BEST ANSWER: Spot Treatment:

0.5 ounces per gallon of water

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 treatment.
Does diquat work on submerged algae if sprayed on top of pond?
Malinda J on May 10, 2018
BEST ANSWER: Submersed Weeds Controlled or Suppressed
Bladderwort, Utricularia spp.
Hydrilla, Hydrilla verticillata
Watermilfoils (including Eurasian), Myriophyllum spp.
Pondweeds, Potamogeton spp.

Coontail, Ceratophyllum demersum
Elodea, Elodea spp.
Brazilian Elodea, Egeria densa
Naiad, Najas spp.
Algae, Spirogyra spp. and Pithophora spp.
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.
Will it affect my lawn if application was applied to lake and I irrigate my lawn next day?
A shopper on Jul 19, 2018
BEST ANSWER: I think there is a warning on the information lable regarding this. Not sure of the number of days ? I would personally wait at least 5 days
How much should I use in 1 gal. sprayer?
A shopper on Jun 27, 2018
BEST ANSWER: 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 treatment.
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.
how do you apply to 2acre pond?
Rick R on May 29, 2018
BEST ANSWER: I dont know abourt two acres. I have a pond that is about 3/4 of an acre. I use a 15 gallon sprayer with a surflo pump and apply from a boat; about one half the pond then the other half several weeks later.
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.
How often can Diquat be applied?
A shopper on Sep 16, 2018
BEST ANSWER: I usually go on a two week max frequency to keep new growth down and vary up to six weeks depending on season.....Also I found spraying just before dusk is most effective
Inundated with duckweed in the pond every year. 9000 gallon pond. We have just added algaecide and muck remover to help the oxygen levels. The duckweed is just starting to spread here (maryland). How much would I need for 9000 gallons and how much wetting agent? We will be using a pump sprayer.
BONNIE L on Jun 17, 2018
BEST ANSWER: The sprayer is 1/3 ounce to 1/2 per gallon...For a wetting agent a few drops of dawn works fine..Start with two week intervals. It goes a long way...but you really need to stay on top of it......
I have a small pond for raising koi, which is 14 ft diameter by 3 ft deep. There is a heavy growth of weeds at the very bottom of the pond. I am going to treat with diquat. Do I require a surfactant and could diquat/surfactant be applied by simply stirring the water with a large oar?
A shopper on May 24, 2018
Diquat Dibromide Aquatic Herbicide
Diquat Dibromide Aquatic Herbicide
Alligare 90 Wetting Agent
Alligare 90 Wetting Agent
BEST ANSWER: I have used the diquat in my pond which is twice as big and two feet deeper without using surfactant and it worked well on my dense infestation on the bottom of the pond.
I have a small backyard pond. It's 3ft deep, & is a total of 700gals. I have a 5 tier waterfall that rotates the water thru my filter back into my pond. I brought in the Naiad weed with water lilies, I purchased 2yrs ago. And this weed is out of control now. Will Diquat kill this weed. I currently have no fish or live anything in my pond. And how do I apply this product ???
Thankyou
A shopper on Jul 19, 2018
BEST ANSWER: Yes it will..read the directions for mix; if you can lower the water level, even better..these are tough plants to get rid of...
Is Diquat safe to use where honeybees are using pond for water source?
Andy T on Jun 26, 2018
BEST ANSWER: Yes, the Diquat is fine to use in ponds that are used by insects for water.
is diquat a restricted chemical? Do I need a license to buy it
A shopper on Jun 19, 2018
BEST ANSWER: No, Diquat is not restricted use chemical. You may want to check with locale regulations in your state to verify there is not any application license required. But on our end this does not require a license to purchase.
Is it harmful for dogs to drink?
A shopper on May 16, 2018
BEST ANSWER: Are you asking if your pets can swim and drink the water after you apply to the pond for weed control?

Yes, it is fine after 1 day for livestock animals.
With this kill lilly pads in the lake i like on? If so Should i mix it and spray directly on the top part of the pad on surface of the water?
Ely C on May 13, 2018
BEST ANSWER: Yes, Diquat will control floating weeds in an aquatic setting. They will need to be treated directly with the herbicide.

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 treatment.
I know it is safe for most fish, but what about grass carp I have for weed control?
A shopper on May 6, 2018
BEST ANSWER: Yes, Diquat will not harm any fish when applied according to the label.
Does Diquat kill large amounts of milfoil?
A shopper on Apr 3, 2018
BEST ANSWER: The Diquat would be perfect for the elimination of watermilfoils. When applying to ponds with aquatic life make sure to treat small portions of the pond at a time to prevent oxygen depletion.
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.

https://www.solutionsstores.com/alligare-90-wetting-agent
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
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.
WILL IT KILL LILLY PADS ALSO
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.

Customer Reviews

4.7 / 5.0
22 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
18
2
1
1
0
Easy to Use
4.6 / 5
Efectiveness
4.8 / 5
Value
4.4 / 5
Safe to Use
4.1 / 5
Would you Recommend?
Yes (11)
No (1)
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
5 / 5
Would you Recommend?
Yes
Outstanding!
Very effective herbicide for control of algae and other plants. Outstanding customer service and technical support. I would highly recommend Solutions for all your Pest control supplies.
August 9, 2018
Purchased
2 months ago
Would you Recommend?
No
I don't know what kind of weed I have but it is spreading. glysophate wont do anything to it. I sprayed it with diquat and it killed the leaves in just a few hours but it recovered so I sprayed it again with same results.i haven't seen any pictures that look exactly like the weed I have.any suggestions?
August 1, 2018
Purchased
3 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
5 / 5
Would you Recommend?
Yes
duckweed removal
I have a 1/3 acre pond that was entirely covered in duckweed. Within a week & 1/2 , the duckweed was all dead and dying. Highly recommend !!
July 21, 2018
Purchased
2 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
4 / 5
Safe to Use
5 / 5
Would you Recommend?
Yes
Works very well. I mix this with my Cutrine plus to give it a little boost when speaking for algae in my pond. I also mix a little in with my Roundup when spraying weeds in the yard.
July 18, 2018
Purchased
5 months ago
Easy to Use
4 / 5
Efectiveness
4 / 5
Value
4 / 5
Would you Recommend?
Yes
seem fine
Seems to work fine hard a big problem that it is fixing, wish it would work faster but it is doing the job
July 10, 2018
Purchased
3 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
4 / 5
Would you Recommend?
Yes
Diquat
The product works as stated, and it's the right product environmentally, as we live just yards from the ocean.
July 9, 2018
Purchased
3 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
4 / 5
Would you Recommend?
Yes
Great Product
Works as advertised in my pond. Quick delivery. Great price too. I will buy again when needed.
July 3, 2018
Purchased
3 months ago
Easy to Use
3 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
3 / 5
Would you Recommend?
Yes
It is poison pay attention to use
Worked on lilly pads in one day, absolutely amazed, difficult instructions, used 8 OZ to 2 gals water worked very well, best on a sunny afternoon just before nightfall weeds dead next day
June 26, 2018
Purchased
3 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
5 / 5
Would you Recommend?
Yes
Easy to apply and very effective.
I have tried many products over the years but none have worked out well as Diquat. After only three days after application, my infestation of mosquito fern was eliminated. It also killed some of the aquatic weeds that were growing at the pond’s edge. There were no problems or injuries to anything desirable (foliage or fish or frogs).
June 17, 2018
Purchased
4 months ago
Easy to Use
5 / 5
Efectiveness
5 / 5
Value
5 / 5
Safe to Use
5 / 5
Would you Recommend?
Yes
Great value
Always used a product called "Reward" before using Diquat. Got the same results while saving 30% /cost!
Good deal & great value!
June 7, 2018
Purchased
4 months ago

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