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Weedtrine D Aquatic Herbicide
Weedtrine D Aquatic Herbicide is designed for broad-spectrum control of many common aquatic weeds that grow on ponds, lakes, and other water bodies.
10/31/25
Weedtrine D Aquatic Herbicide, manufactured by Cygnet Enterprises, is a broad-spectrum herbicide that effectively and rapidly controls a wide range of aquatic weeds.
Once applied, this emulsifiable concentrate will control various submerged, subsurface, and weeds growing on the bottom of bodies of water.
Weedtrine D Aquatic Herbicide provides flexibility by being able to be broadcasted in large areas at one time or as a spot treatment to kill weeds in smaller areas without damaging surrounding plants. Either way, it's an affordable option for aquatic weed control.
Tools Needed
You will need either a handheld pump sprayer, backpack sprayer, or skid sprayer. We suggest using and adjustable tip nozzle to make effective applications.
How to Use
- Step 1: Determine how much Weedtrine D Aquatic Herbicide you will need by measuring the size of the treatment area. For aquatic applications, you will need to calculate the surface area by measuring length x width and the volume of your pond or water body by measuring length x width x depth. Weedtrine can be applied at a rate between 2 oz. and 6.5 oz per gallon of water, depending on the weed you are treating. Depending on what type of weed you are treating, the gallons per surface acre differs. For instance, it is recommended to use 5 to 10 gallons per surface acre for submersed weeds, 2.5 to 3.75 gallons per surface acre for floating weeds, and 5 gallons for emergent weeds.
- Step 2: For pump sprayer or backpack sprayer applications, add 1/3 to 1/4 of the water to the spray tank first, then add the correct amount of Weedtrine D based on your calculations. Agitate the sprayer well to ensure the solution is well mixed.
- Step 3: Pump the sprayer and spray uniformly over the water surface in coarse droplets. The product begins to work immediately on contact. Wilting and loss of foliage occur quite rapidly. Spray the solution until the targeted areas are wet; do not overapply. Within two weeks, make another application if needed.
Where to Use
Weedtrine D Aquatic Herbicide can be used on land or in various aquatic areas. On land, it can be applied along roadsides, fence lines, parks, golf courses, farmyards, storage areas, and dry, non-flooding areas. Approved aquatic areas are ponds, drainage ditches, canals, streams, rivers, and other still or slow-moving bodies of water.
When to Use
This product can be used by farmers, homeowners, city workers, and those who need to control weeds found on land or in water. It is ideal to use before weeds reach 6 inches in height and before the growth becomes too dense or weeds flower.
Safety Information
Weedtrine D Aquatic Herbicide is safe for pets, livestock animals, and children when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when mixing or applying this product.
Do not enter land areas until the treatment has dried, and do not enter aquatic areas while the treatment is occurring.
Special Considerations
Do not use under conditions involving possible drift to food, forage, or other plantings that might be damaged.
| Availability | Online | 
| Restricted Use | No | 
| Shipping Restrictions * = not registered** = restricted use | 1 Gallon: AK*, AL*, AR*, CO*, CT*, DC*, DE*, ID*, IL*, IN*, LA*, MA*, MD*, ME*, MI**, MN*, MO*, MS*, NC*, ND*, NH*, NM*, NV*, NY*, PA*, SC*, TN*, TX*, UT*, VT*, WI* | 
| Brand | CYGNET ENTERPRISES | 
| Keith's Pro Tips | "Weedtrine does a great job on its own, but it is suggested to add at least 1 oz. of non-ionic surfactant per 10 gallons of spray solution for best results." | 
| Product Drawbacks | Turbid water or mud covered foliage will reduce absorption and effectiveness. | 
| Target Pests | Effectively controls: Bladderwort, Coontail, Elodea, Naiad, Pennywort, Pondweeds, Salvinia, Water Hyacinth, Water Lettuce, and Watermilfoil. | 
| Application Equipment | Backpack Sprayer, Pump Sprayer, Spray Rig | 
| Application Methods | Broadcast Spray, Spot Treatment | 
| Active Ingredient | 8.53% diquat dibromide | 
| Product Type | Herbicide | 
| Formulation | Suspended Concentrate | 
| Application Rate | 2 oz. to 6.5 oz. per gallon of water. Submersed weeds: 5-10 gallons per surface acre. Direct pour, underwater injection, or surface spray. Floating Weeds: 2.5-5 gallons per surface acre. Use surface spray applicator of solution. Emergent Weeds: 5 gallons Algae Control: 0.5 to 1.5 ppm. For more specific application rates please refer to the label. | 
| Shelf Life | Weedtrine D will last 1 to 2 years when stored according to the product label. Store Weedtrine D in a cool, dry storage area in its original container. | 
| Yield | One gallon of Weedtrine-D Liquid covers 4,000 sq. ft. of submersed weeds or 8,000 to 10,000 sq ft. of floating, emersed, or terrestrial weeds. | 
| Use Sites | Outdoors | 
| Time to Kill | Weedtrine works quickly and you should see results within 1 to 2 weeks of application. | 
| Comparable Products | Diquat | 
| EPA Registration # | 8959-9 | 
| Restricted Use | No | 
|---|---|
| Shipping Restrictions | AK, AL, AR, CO, CT, DC, DE, ID, IL, IN, LA, MA, MD, ME, MN, MO, MS, NC, ND, NH, NM, NV, NY, PA, SC, TN, TX, UT, VT, WI | 
| Availability | Online | 
| Signal Word | WARNING | 
| Keith's Pro Tip | "Weedtrine does a great job on its own, but it is suggested to add at least 1 oz. of non-ionic surfactant per 10 gallons of spray solution for best results." | 
| Target Pests Multi | Pennywort, Algae, Bladderwort, Coontail, Elodea, Filamentous Algae, Naiad, Pondweed, Salvinia, Water Hyacinth, Water Lettuce, Watermilfoils | 
| Time to Kill | Weedtrine works quickly and you should see results within 1 to 2 weeks of application. | 
| Chemical Type | Herbicide | 
| Formulation | Suspended Concentrate | 
| Application Methods | Broadcast Spray, Spot Treatment | 
| Product Drawbacks | Turbid water or mud covered foliage will reduce absorption and effectiveness. | 
| Active Ingredient | 8.53% diquat dibromide | 
| Application Equipment | Backpack Sprayer, Pump Sprayer, Spray Rig | 
| Mix Rate | 2 oz. to 6.5 oz. per gallon of water. Submersed weeds: 5-10 gallons per surface acre. Direct pour, underwater injection, or surface spray. Floating Weeds: 2.5-5 gallons per surface acre. Use surface spray applicator of solution. Emergent Weeds: 5 gallons Algae Control: 0.5 to 1.5 ppm. For more specific application rates please refer to the label. | 
| Use Sites | Outdoors | 
| Yield | One gallon of Weedtrine-D Liquid covers 4,000 sq. ft. of submersed weeds or 8,000 to 10,000 sq ft. of floating, emersed, or terrestrial weeds. | 
| EPA Registration No. | 8959-9 | 
| Shelf Life | Weedtrine D will last 1 to 2 years when stored according to the product label. Store Weedtrine D in a cool, dry storage area in its original container. | 
| Comparable Products | Diquat | 
| Children or pets? | Yes | 
| Property Characteristics | None | 
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.
 






