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Reward® Landscape and Aquatic Herbicide is a non-selective, highly active herbicide for control of floating, submerged and marginal aquatic weeds. Ideal for non-selective weed control in turf and landscapes as well. Reward® provides fast burn-down, works in cold weather and is rain fast in as little as 30 minutes. The active ingredient, diquat dibromide, has been used successfully in sensitive aquatic areas for over 25 years. Product Label  SDS Sheet

Begins to Work on Contact for No-Wait Control

Reward® is a contact herbicide rapidly absorbed by target plants within minutes of application. Reward® also rapidly kills undesirable above-ground weed growth in 24 to 36 hours. Avoid application to desirable plants. It is essential to obtain complete coverage of the target weeds to get control.


Reward® Aquatic Herbicide is Labeled for Use Against:

Click on your desired weed for more information and alternate control options.






(Utricularia spp.)


(Ceratophyllum demersum)


(Elodea spp.)


(Lemna spp.)





Filamentous Algae* (Pithophora spp & Spirogyra spp.)


(Hydrilla verticillata)


(Najas spp.)


(Salvinia spp. including S. molesta)

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Water Buttercup

(Ranunculus flabellaris)

Water Lettuce

(Pistia stratiotes)

Water Hyacinth

(Eichhornia crassipes)

Water Pennywort (Hydrocotyle spp.)

 *Suppression only. For control of Spirogyra and/or Pithophora, use Reward Landscape and Aquatic Herbicide in a tank mix with an approved algaecide.

For very dense submersed aquatic plant populations, resistant species and certain types of algae, it is manufacture recommended to use Reward® in combination with an approved tank-mix partner. Approved tank mix partners include: Clearigate, K-Tea, Komeen, Cutrine Plus, Aquathol K and Hydrothol 191.


Reward® is effective anytime it is applied to live foliage that is reasonably developed, but before growth becomes too dense or weeds flower. Application rates vary; refer to the label for the target plant dosage rates required. Mix the required amount of Reward® with pond water according to label instructions preferably on a sunny day. When exposed to light Reward® becomes activated and kills the weed. For difficult to control weeds the addition of Cutrine Plus can boost effectiveness. Under low light conditions, Reward® may translocate to other weed parts from the point of contact.

Use of a non-ionic surfactant such as Cygnet Plus will increase the penetration of the product throughout the entire plant for better results.

Once completely dead, use a rake, such as the Weed Raker, to remove dead weeds. Apply Bio Boost Muck Digesting Pellets post treatment to digest dead plant material and consume organic muck.

To apply, determine the volume of water to be treated. Dilute with a minimum of 9 parts water. Spray uniformly over the water surface with a tank or backpack sprayer. Allow material to rain down in coarse droplets for better surface penetration.

Reward® Example:

  • Sample 100ft x 100ft Lakeshore Lot (.23 Acre) 4 ft. avg. depth
    Amount of Reward required: 0.46 Gal for Submerged weeds.
  • Sample 148ft x 148ft Pond (.50 Acre) 4 ft. avg. depth
    Amount of Reward required: One Gal for Submerged weeds.

Gallons per Surface Acre (Submerged Species)


Average Water Depth

1 Foot

2 Feet

3 Feet

4 Feet

5 Feet

6 Feet

1 Gallon/Acre







2 Gallons/Acre







*Consult Label for Exact Doses & Important Application Directions.

For Best Results

Begin application in spring as water temperature warms to 50º F and above. Heavy, out of control growth may require more than one application or physical removal to gain control. For best results, use under conditions of minimal water flow. Apply early on the morning of a calm, sunny day when the plants are actively involved in photosynthesis. The biggest mistake people make is to come home from work and treat vegetation. Contact time should be at least 3 hours.

Turbid water or mud-covered foliage will reduce absorption and effectiveness.

For algae control best results are achieved when mixing Reward® is combination with Cygnet Plus, Cutrine Plus and Bio Boost Enzyme 300. Dose requirements are less for Duckweed control or shallow waters of less than 2 Feet. For Duckweed control the label recommends adding a non-ionic surfactant. One quart of Cygnet Plus Surfactant is typically enough for most projects. Add Bio Boost Enzyme to the Tank Mix to increase the effectiveness of the algae treatment. Treat heavy infestations in sections to avoid oxygen depletion.

Water Use Restrictions


Water Use Restrictions


Application Rate




Spray Tank Applications**



Livestock & Domestic Animal Consumption

Irrigation to Turf & Landscape Ornamentals

Irrigation to Food Crops and Production Ornamentals

2 gals./surface acre

3 days


1 day

3 days

5 days

1 gal./surface acre

2 days


1 day

2 days

5 days

0.75 gal/surface acre

2 days


1 day

2 days

5 days

0.50 gal/surface acre

1 day


1 day

1 day

5 days

Spot Spray*

(<0.5 gal./surface acre)



1 day

1 day

5 days



Always read and carefully follow the product label. For use restrictions refer to product label.

A WI DNR Aquatic Plant Control Permit or DATCP Fish Farm License is required in WI in order to apply algaecides or herbicides. In addition ponds and lakes with overflows not contained on the property are required to obtain a WPDES permit. Illinois Residents are required to obtain NPDES permits through the Illinois EPA.

Recommendations of pesticide or treatments for specific algae or aquatic plants are provided for general information purposes only - no warranties are expressed or implied.