Information on Clipper Herbicide

Clipper Herbicide contains 51% Flumioxazin

Clipper Ingredient Flumioxazin

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Clipper Aquatic Herbicide Ingredient – Flumioxazin Chemical Fact Sheet

Formulations Flumioxazin has been used as an agricultural chemical since 2001, and was conditionally registered for aquatic use in 2010. The active ingredient is 2-[7-fluoro-3,4-dihydro-3-oxo-4-(2-propynyl)-2H-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1H-isoindole-1,3(2H)-dione. It is available in granular form (Clipper™) for control of submerged plants, and can be used as a direct foliar application to control emergent and floating-leaf plants. It also controls some filamentous algae. Aquatic Use and Considerations Flumioxazin is a broad-spectrum contact herbicide. It works by interfering with the plants’ production of chlorophyll. Treated plants will respond quickly to treatment and rapidly decompose. For larger treatments or in dense vegetation, split treatments about two weeks apart are recommended to prevent fish suffocation from low oxygen due to decaying plants.

Flumioxazin needs to be applied to young plants early in the spring as they begin to grow. It should not be used in very hard-water lakes (pH over 8.5), many of which occur in southeastern Wisconsin. Application in the early morning will increase efficacy, particularly in hard-water lakes. A water body should not be treated with flumioxazin if there is an outlet, or in moving waters such as rivers or streams. Flumioxazin controls invasive Eurasian watermilfoil (Myriophyllum spicatum) and curly-leaf pondweed (Potamogeton crispus). It may also affect desirable native species, such as coontail (Ceratophyllum demersum), duckweeds (Lemna spp.), some pondweeds (Potamogeton illinoensis, P. diversifolius, Stuckenia pectinata) and native milfoil (M. heterophyllum). Post-Treatment Water Use Restrictions There are no restrictions on swimming, eating fish from treated water bodies, or pet/livestock drinking water use.

Clipper Herbicide contains 51% Flumioxazin

Clipper is approved for aquatic use to control unwanted nuisance weeds

There is a five-day restriction on irrigation. Herbicide Degradation, Persistence and Trace Contaminants Flumioxazin is broken down rapidly by water and microbes. The half-life (the time it takes for half of the active ingredient to degrade) depends on the pH of the water. In low pH water (such as in northern Wisconsin) the half-life is four to five days; in high pH water (such as in southeastern Wisconsin) the half-life is a day or less. When flumioxazin degrades, it breaks down into two compounds known as APF (6-amino-7-fluoro-4-(2-propynyl)-1,4,-benzoxazin-3(2H)-one) and THPA (3,4,5,6-tetrahydrophthalic acid). Flumioxazin has a low potential for leaching and would not persist in the environment. APF and THPA do have a high potential to leach through soil and may be persistent.

Environmental Impact

Impacts on Fish and Other Aquatic Organisms Tests on bluegill and rainbow trout indicate that flumioxazin is slightly to moderately toxic to fish. Flumioxazin is moderately to highly toxic to aquatic invertebrates, with possible impacts below the labeled maximum rate of 400 ppb (parts per billion). It is practically non-toxic to birds, small mammals and bees. The potential for bioaccumulation is low, since flumioxazin breaks down in the water very rapidly. The metabolites APF and THPA have not been assessed for toxicity or bioaccumulation.

Human Health The risk of acute exposure would be primarily to chemical applicators; concentrated flumioxazin does not pose an inhalation risk, but can cause some skin and eye irritation. Recreational users of a water body would not be exposed to concentrated flumioxazin. Chronic health effect studies indicate that flumioxazin is not carcinogenic. Adverse effects did occur in some of the studies on reproduction and development, including reduced offspring viability, malformation in cardiac and skeletal development, and anemia. Flumioxazin does not bioaccumulate in mammals, with the majority excreted in a week.

Pond covered with duckweed

Clipper vs. Duckweed (hint: Clipper Wins)

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All around the world, Duckweed plagues so many lakes and ponds that if one could think of a way to harvest the nuisance weed for profit, one would be rich! However, as it stands, no one has come up with a way to profit from this little green floating plant and for most lake or pond owners, getting rid of or controlling duckweed is the only way to go if you ever want to see your water again. Luckily, Clipper Herbicide makes it easy to knock down and eliminate Duckweed FAST. So, hold on to your boots and lets see how it works!

Clipper herbicide contains Flumioxazin at a 51% concentration which is more than enough to kill unwanted duckweed on contact. Clipper, like most aquatic weed killer, needs to be sprayed over the target areas in order to maximize effectiveness. Luckily, you will not have to ‘mist’ or ‘coat’ each individual floating duckweed since Clipper spreads out nicely upon hitting water and does so better than many other aquatic weed killers.

Close-up of duckweed flooating on pondRequiring only 12oz per acre, powerful Clipper gets to work fast at eliminating Duckweed. Where other treatments might need gallons upon gallons of chemical added directly to your pond, Just a tad bit of Clipper will do the trick and normally offer superb results with just one treatment. Of course, severe of very heavily infested lake and ponds may require additional treatments and other variable may come into play such as re-infestation, flow, depth etc.

For those who are not sure what duckweed looks like, the weed is a small oval shaped elongated weed with a vibrant green color. Duckweed floats freely over the surface of the water and usually begins showing up around the shoreline in early to mid spring. Duckweed has a small stem or root which hangs down below the leaf to drink up fresh nitrogen and other fuels in your pond. By summer, the weed usually covers your entire pond, making it look like a ‘golf course’. Problem is, the lake or pond is NOT a golf course and the weed at that point, needs to go.

Why is Duckweed infesting your water? Well, most of the time, the more ‘welcoming’ your pond is, the more likely you will wind up with a duckweed infestation. By ‘welcoming’, we mean, rich and friendly for growth. You see, as lakes and ponds age, years and years of sludge and muck develop in the base of the pond. This buildup is rich in organic fuels consisting of nitrogen, phosphates and micronutrients that plants just love! Think of it as if you were to toss food scraps into your garden soil. Over time the soil would help promote phenomenal plant growth and the same holds true for lakes and ponds.

Once you have the duckweed eradicated and under control, the best thing you can do to help reduce fuels and balance out the ponds ecosystem is to add a powerful bacteria digester. Aquatic sludge and muck digesters have the ability to rapidly breakdown that thick compost sitting on the bottom of your pond and will bring down the fuels to help make your water less inviting to problems. Bacteria additives should be applied heavily at first to bring down nitrate and phosphate levels. After the initial heavy dose stage, regular bi-monthly treatments should be administered to assure that your rich much is breaking down at optimal speeds.

After you have successfully eliminated duckweed from your lake or pond, maintaining your water is crucial to help stabilize things and assure that your pond looks like a pond, an not a golf course. Duckweed is often carried into ponds by birds, animals and small reptiles suchDuckweed begining to dye down after applying Clipper herbicide as turtles. If you find that you have a re-infestation starting where small pockets of duckweed begin forming around your shoreline, act quickly and spray down the weed with a potent quick knockdown aquatic weed killer. Doing so will help prevent the spread of duckweed and will allow you to kee the pond in check, assuring that the duckweed will never again get out of control.

Many companies offer aquatic control assistance and will help guide you as far as treatment guidelines and quantities go. Once such firm is NewTechBio which offers nationwide coverage. NewTechBio carries a full line of Clipper herbicide products and is available at their website , by phone 800-509-0927 or by email at

Pond covered with watermeal

Using Clipper to Control Watermeal

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As a new weapon against many common nuisance weeds, Clipper herbicide produces fantastic control with a rapid kill when applied to watermeal. Clipper works fast and with proper application will eliminate all watermeal in the target zone normally within 7 to 14 days.Watermeal prior to Clipper application
There are a few techniques that are listed below which will help maximize the effectiveness of your application;

1) Clipper needs to be applied to all areas where the watermeal is present. Clipper is a potent knock down killer which acts fast and dissipates quickly so good coverage is necessary for complete control.

2) Prepare an attack plan ahead of time making sure to include any hard to reach areas and nooks as part of your treatment zone. A small amount of watermeal that escapes treatment can quickly re-infest the entire pond in weeks so again, complete coverage is necessary.

3) As with any treatment, watermeal that escaped treatment may reappear. If this occurs, a 2nd treatment should be used as soon as the growth appears.

4) Once tank mixed, Clipper begins to degrade fairly rapidly so a fast treatment is needed. Make sure that you have everything in place and ready to go so as to not lose time after mixing.

5) Treating early in the morning is suggested preferably on a calm sunny day.

6) The ideal recommended dose is 1.1lbs per acre foot. Meaning, if your pond is 1 acre large and averages 4 feet deep, your suggested rate will be 4.4 lbs of clipper to eliminate all of the watermeal. Lower doses may be effective but at the preferred rate, you will effectively add enough Clipper to bring your concentration levels to 200ppb, suitable to knock down watermeal.

7) Keep an eye on the shoreline throughout the year for any reintroduction of watermeal. If you see small specks appearing they can usually be controlled with a fast acting knockdown killer such as diquat or spot treat with Clipper. Paying attention to the shoreline will help keep total infestation at bay for a few to many years depending on how aggressive you monitor the pond.

8) As the watermeal die down they are converted to sludge through the decomposition process. Balance the eco system by digesting the excess fuels in the water after treatment and early in the year prior to infestation. A potent bacteria will in essence treat your pond like a large compost and will help accelerate the breakdown of organics plaguing most ponds.

9) Apply a light blocking dye early in the season at least once, simultaneously with a sludge digester. This method of early treatment will maximize the eco balance and will start the pond off properly and in a pre-preparation condition.

10) Keep fertilizers away and never discard grass clippings of leaves into your water.

Clipper Herbicide Course

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So What Can Clipper Herbicide Really do for Me?

Clipper Herbicide in Action


  • New chemistry/MOA in PPO inhibitor
  • High efficacy against Cabomba, Hydrilla including rHydrilla, Duckweed, watermeal
  • Short contact time = fast uptake
  • There and gone within 2-3 days
  • No drinking, fishing, or swimming restrictions


  • Active Ingredient: flumioxazin
  • Mode of Action: Initiates cell membrane disruption
  • Low toxicity (minimal PPE)
  • Good environmental profile
  • 51% WDG (water dispersible granule)

Algae Control

  • Algae types include filamentous algae (Pithophora and Cladophora)
  • 200 ppb target rate
  • Some planktonic control observed
  • Tank mix and rotate

Clipper Herbicide Tackles More Opponent’s

Canal infested with Cabomba cleaned up by Clipper and ready for fun!

Canal infested with cabomba treated with Clipper herbicide before and after.

Canal infested with cabomba treated with Clipper herbicide before and after.

Watermeal covered pond 100% cleared in only 8 days after Clipper Herbicide application.

Watermeal covered pond 100% cleared in only 8 days after Clipper Herbicide application.

Watermeal completely eradicated in only 8 days after Clipper Herbicide Treatment.

Clipper Specifics!

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Here are the specific use details that everyone has been asking for. If you do not see your situation listed here, just ask and we will assist!

Product Used On

drainage ditches
reservoirsDuckweed covered pond without Clipper


alligator weed
water fern
water lettuce
water pennywort
filamentous algae
curlyleaf pondweed
sago pondweed
Eurasian watermilfoil
variable-leaf watermilfoil

State Registrations*

New Hampshire
New Jersey
New Mexico
North Carolina
North Dakota
Puerto Rico
Rhode Island
South Carolina
South Dakota
Washington, DC
West Virginia

Clipper Herbicide is registered for use in the states above. As always, be sure to check to make sure a specific use pattern is ‘ok’ in your location before use. You can contact your local state agency for more information and the latest filings or approvals.

Clipper Herbicide Training Instructions

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Clipper is a fast-acting, contact aquatic herbicide that controls selected submerged and floating aquatic plants.

Clipper delivers:

  • Rapid and selective control of invasive and nuisance plants, like cabomba, watermeal, duckweed, watermilfoil, water lettuce, giant salvinia, pondweeds and more
  • Dissipates quickly from the water column = minimal irrigation restrictions
  • Reduced personal protective equipment (PPE) requirements = ease of application and handling

NOTE: Applications of Clipper may require special approval and/or permits. Consult with local state agencies if required

Active Ingredient: Flumioxazin

Clipper is a Group 14 Herbicide (HRAC)




  • Class of chemistry: Protoporphyrinogen oxidase (PPO) inhibitor
  • Mode of action: Initiates cell membrane disruption

Clipper dissipates quickly from the water column and does not accumulate in sediment. Irrigation of turf and ornamentals can resume 24 hours after treatment when applied at 1 lb of Clipper per acre foot of water.

Aquatic Vegetation Controlled

Clipper effectively manages undesirable floating and submerged aquatic vegetation.

Clipper controls:

  • watermeal
  • duckweed
  • cabomba/fanwort
  • Eurasian watermilfoil
  • hydrilla
  • alligatorweed
  • frogs-bit
  • water fern
  • water lettuce
  • water pennywort
  • filamentous algae
  • pondweed
  • coontail
  • curlyleaf pondweed
  • variable-leaf watermoilfoil





Eurasian Watermilfoil


Product Performance

Clipper covers both golf lakes & ponds and traditional aquatic waterways.

The following photos show the effect of Clipper on watermeal 14 days after treatment. Clipper was applied at 200 ppb.


The following photos show the effects of Clipper on curlyleaf pondweed (submerged) and filamentous algae (floating) in a pond in Northwest Connecticut. Clipper was applied at 200 pbb.

In these photos, Clipper was applied at 200 ppb as a submersed treatment for cabomba in this shallow canal.

How Clipper Works

Clipper provides fast and selective control of undesirable, invasive and nuisance aquatic vegetation.

  • Clipper is activated by sunlight resulting in cell membrane disruption
  • The greater percentage of leaf area covered with Clipper increases control
  • Clipper is not translocated
  • Key aspects for obtaining optimal performance with Clipper:
    • Plant size – apply when plants are small and actively growing
    • Plant density – apply before plants are dense and the foliage is packed together
    • Product coverage – obtain the best coverage possible
    • Ideal conditions include an application in the morning of a bright sunny day

Application Information

Always read and follow label instructions

  • Rate: 1 lb of product per acre foot = 200 ppb
  • Timing: Clipper is a contact herbicide that quickly degrades in water and should contact undesirable vegetation within 2 hours following an application
  • Additive: Add a surfactant when targeting floating aquatic plants
  • Equipment:
    • Apply Clipper with sprayers equipped with a nozzle designed to deliver the desired spray pressure and spray volume
    • Apply by backpack or handgun sprayer, airboat, helicopter, airplane or other application equipment that will ensure thorough coverage of target plant foliage
  • When applied according to label instructions, there are no restrictions for swimming, drinking or fishing

Use Restrictions and Precautions

  • Do not apply to intertidal or estuarine areas
  • There is no post-application holding restriction against use of treated water for drinking or for recreational purposes such as swimming or fishing
  • In areas with dense vegetation, treat only half the water body at one time and wait 10 to 14 days before treating the remaining area; do not re-treat the same section of water within 28 days of application
  • Do not re-treat the same section of water with Clipper more than 6 times per year
  • Do not exceed 400 ppb of Clipper during any one application

Irrigation Restrictions

Clipper dissipates quickly from the water column, so it has minimal irrigation restrictions.

Clipper Application

Application Rate

Water Depth

Turf and Landscape Ornamentals

Greenhouse, Nursery and Production Ornamentals

Application to control floating and submerged plants

200 ppb = 1 pound of Clipper per acre foot deep of water

When calculating use rate, use an average water depth

Wait 1 day following application to use water for irrigation

Wait 5 days following application to use water for irrigation

Always read and follow label instructions.

Tank Mixes

Clipper may be tank mixed with 2,4-D, diquat, glyphosate or other registered aquatic herbicides for enhanced control of floating and submerged plants.

Consult manufacturers’ labels for specific restrictions, use instructions and plants controlled. Always follow the most restrictive label restrictions and precautions for all products used when making an application involving tank mixes.

The Case for Clipper

Clipper controls key plants in both golf and traditional aquatics. It’s tough. It’s fast. And, it’s gone.


Clipper Key Points

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Percentage of States where Clipper is used?
- Key use/pests

Clipper Aquatic Herbicide

        Product Used On            

  • bayous
  • canals
  • drainage ditches
  • lakes
  • marshes
  • ponds
  • reservoirs



  • alligator weed
  • frogs-bit
  • water fern
  • water lettuce
  • water pennywort
  • filamentous algae
  • coontail
  • duckweed
  • fanwort
  • cabomba
  • hydrilla
  • pondweed
  • curlyleaf pondweed
  • sago pondweed
  • watermeal
  • Eurasian watermilfoil
  • variable-leaf watermilfoil


State Registrations*

  • Alabama
  • Arizona
  • Arkansas
  • Colorado
  • Connecticut
  • Delaware
  • Florida
  • Georgia
  • Hawaii
  • Idaho
  • Illinois
  • Indiana
  • Iowa
  • Kansas
  • Kentucky
  • Louisiana
  • Maine
  • Maryland
  • Massachusetts
  • Michigan
  • Minnesota
  • Mississippi
  • Missouri
  • Montana
  • Nebraska
  • Nevada
  • New Hampshire
  • New Jersey
  • New Mexico
  • North Carolina
  • North Dakota
  • Ohio
  • Oklahoma
  • Oregon