Gary Tollen, Author at Clipper Herbicide

Clipper Herbicide contains 51% Flumioxazin

Clipper Ingredient Flumioxazin

Posted by | Clipper Information | No Comments

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.

Clipper SC Herbicide

Clipper SC Makes Headlines

Posted by | Clipper News | No Comments

Tough. Fast. Gone.

Clipper® SC delivers fast and selective control of tough invasive and nuisance plants such as cabomba, watermeal, Eurasian watermilfoil, water lettuce, duckweed, giant salvinia and more. Plus, Clipper SC dissipates quickly from the water column and does not accumulate in sediment. With 4 lb of flumioxazin per gallon, Clipper SC offers easier handling and mixing.


  • Convenient liquid formulation improving ease of application, transport, and handling – 1 liquid fl oz Clipper SC = 1 dry oz Clipper WDG
  • Fast and selective control of tough invasive and nuisance plants
  • Dissipates quickly from the water column and does not accumulate in sediment, giving it a favorable environmental profile
  • Easy mixing, handling, and measuring
  • Less packaging
  • Improved efficacy with less pH sensitivity
Clipper® SC is a contact herbicide that quickly degrades in water. Good coverage and contact time is essential. Make applications with sufficient volume of water according to the label. When making applications to floating or emergent weeds, apply at 6 to 12 fl oz per acre and mix with an adjuvant approved for aquatic sites. For subsurface applications, apply Clipper SC at 200 to 400 ppb in the water column. Please see label for information on the effects of high pH on plant response and efficacy.


Unlike WDG formulations, liquid Clipper SC blooms quickly and mixes easily. With only slight agitation, Clipper SC mixes evenly and completely. Plus, it stays in suspension longer – even after two hours without agitation Clipper SC shows no signs of settling.


No restrictions for swimming, drinking, or fishing.

DO NOT apply to intertidal or estuarine areas.

In areas with dense weed vegetation only treat 1/2 the water body at one time and wait 10-14 days before treating the remaining area. DO NOT re-treat the same section of water within 28 days of application.

Treated water may not be used for irrigation purposes on food crops until at least five days after application.

Treated water may be used for irrigation purposes on turf and landscape ornamentals as outlined in the Irrigation Restrictions Following Application table below.

DO NOT use in water utilized for crawfish farming.

DO NOT re-treat the same section of water with Clipper SC more than 6 times per year.

DO NOT exceed 400 ppb of Clipper SC during any one application.


See label for complete application rates and recommendations.


Trial Work, M. Belland, Aquatic Control Technology, 2012 Application Date: May 17, 2012
Pond Location: Northwest Connecticut Target Plants: Curlyleaf pondweed (submersed) and filamentous, green algae (floating)

flumioxazin (44%)






2 x 2.5 gal

For the management of undesirable aquatic vegetation in slow moving or quiescent waters


(See product label for complete list)
Alligator weed
Curlyleaf pondweed
Eurasian watermilfoil
Filamentous algae
Green algae
Sago pondweed
Variable-leaf watermilfoil
Water fern
Water lettuce
Water pennywort
Pond covered with duckweed

Clipper vs. Duckweed (hint: Clipper Wins)

Posted by | Clipper Information | No Comments

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

Clipper Now Registered for use in California

Posted by | Clipper News | No Comments

Clipper Now Registered for use in California!

Valent Professional Products and Nufarm announced that Clipper Aquatic Herbicide has been registered by the California Department of Pesticide Regulation for use by golf course superintendents, lawn care operators and aquatic resource managers in California.

A fast-acting contact herbicide, Clipper is the only PPO inhibitor with proven activity on both floating and submersed plants, providing valuable flexibility for applicators. Clipper selectively controls a number of invasive and nuisance aquatic plants, including submersed plants such as hydrilla, Eurasian watermilfoil, curlyleaf pondweed and cabomba, as well as floating plants such as duckweed, watermeal, giant salvinia and water lettuce.Green weeds and algae growing in a pond.

With a new chemistry and a new mode of action for California applicators, Clipper plays an important role in herbicide resistance management programs. Additionally, Clipper offers reduced personal protective equipment (PPE) requirements compared to many other products, a convenient package size and a non-corrosive, dry, flowable formulation for easy mixing, transport and application.

“The aquatics industry in California has lacked options for control of tough plants such as duckweed and watermeal as well as invasive species such as water lettuce,” said Dr. Mike Riffle, manager of development and technical services for Nufarm. “Clipper provides these markets with a new mode of action for control of floating and submerged weeds, an effective new tool for invasive species control and versatile application methods for ease of use.”

Registered for use via foliar and/or surface spray, submersed injection or aerial application, Clipper works swiftly and then dissipates quickly from the water column and does not accumulate in sediment, an important attribute for California applicators.

“California has a lot of the same problems we have in other parts of the country, but, due to a continued lack of rainfall, they are a lot more reliant on their ponds for irrigation,” said Dr. Joe Chamberlin, regional field development manager for Valent Professional Products. “Duckweed, watermeal and filamentous algae clog irrigation systems if left unchecked, making it even more critical to control these plants so that irrigation systems can keep working.”

As part of an agreement announced by Valent U.S.A. Corporation and Nufarm in February, Clipper is now available exclusively through Nufarm.

source: from:

Pond covered with watermeal

Using Clipper to Control Watermeal

Posted by | Clipper Information | No Comments

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

Posted by | Clipper Information, Clipper News | No Comments

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.

Parrotfeather in stream

Clipper vs. Parrotfeather (Clipper wins)

Posted by | Clipper News | No Comments

The aquatic weed Parrotfeather is a rooted weed that generally grown in shallow subsurface areas throughout the United States and many other countries. The plant gets its name from due to its appearance which is usually similar to bunches of leaves that become emergent as the plant matures. The emergent portion of the plant swirls and groups to form a dense mat, thus the name Parrotfeather.Parrotfeather in canal area

The plants are not entirely detrimental to the pond provided growth is not excessive. Letting parrotfeather flourish unattended for years can result in virtually all areas of the pond being completely covered. As the old growth dies down, it begins to decompose which provides nutirents for the aquatic life within the water. Exorbitant amounts of decomposition can lead to oxygen depletion and can have a negative impact on the ponds entire ecosystem.

As Parrotfeather left untamed can become a true nuisance weed, growth control is always preferred since the weed is invasive and there are many alternate, less all consuming, options to add to your aquatic foray.Parrotfeather in stream

Clipper herbicide containing flumioxazin is an excellent choice when dealing with excess Parotfeather infestation. Clipper is a fast acting contact control product that will eradicate all target weeds when applied per labeling. It is best to apply Clipper early in the day and quickly after tank mixing the spray solution. Light blocking aquatic dye’s such as Aquashade can help control growth prior to a Clipper application. Follow all directions on container labels to assure maximum blockage.

Mass Approves Clipper 2014


Posted by | Clipper News | No Comments

MDAR/MassDEP 1 June 2013 -reposted here 2014
(June 2013)

MDAR/MassDEP 2 June 2013
This document is a review of the aquatic herbicide Clipper® (EPA. Reg. No. 59639-161; Valent
Biosciences Corp.). It contains product-specific aspects related to use characterization, inert
formulation ingredients and adjuvants, and toxicity and effects of these ingredients to human
health and non-target organisms. This document complements the MDAR/MassDEP review of
the active ingredient flumioxazin (MDAR/MassDEP 2013).
1. Product Formulation
The product label indicates that the Clipper Herbicide is formulated as water dispersible granules
containing 51% flumioxazin by mass (Valent Corp., 2012). The MSDS document indicates that
the formulation also contains kaolin clay as a carrier at approximately 16% by mass. The identity
of the other ingredients (also referred to as inerts) in Clipper Herbicide is considered proprietary;
therefore, the manufacturer does not identify the other ingredients on the general or supplemental
product labels or material safety data sheets (MSDS).
Proprietary information on the other formulation ingredients was obtained through a request for a
Confidential Statement of Formula. The proprietary ingredients were evaluated as part of this
review, but cannot be disclosed here for reasons of confidentiality.
The product label indicates that treatment of emergent vegetation requires the addition of spray
adjuvants to the tank mix. As directed on the label, only adjuvants labeled for aquatic use should
be utilized. Specific recommendations for adjuvants include those that contain non-ionic
2 Use Characterization
2.1. Use Sites
The product label for the flumioxazin-formulated Clipper Herbicide specifies that this product
may be applied for the control of vegetation in aquatic sites. Clipper Herbicide provides control
of various submerged, emergent, and floating aquatic plants. The product may be applied directly
to the water where there is limited or no outflow, including wetlands, lakes, fresh water ponds
and reservoirs (Valent Corp., 2012).
2.2. Application Methods
Clipper Herbicide is applied as a water-based solution having a pH of 5 to 7. If treating floating
or emerged weeds the addition of an adjuvant to the tank mix is needed. The product may be
broadcast applied to the water surface or injected below the water surface. The label suggests
that early morning applications may enhance weed control. The product may be applied by
backpack or handgun sprayer, airboat, helicopter, airplane or other application equipment that is
MDAR/MassDEP 3 June 2013
capable of thorough coverage of target plant foliage. Subsurface application may be done using
weighted trailing hoses to ensure the release of the herbicide under the surface and throughout
the biomass of aquatic vegetation. In situations where aquatic vegetation is dense, the label
suggests that up to half of the water body be treated at a time to avoid a rapid decrease in
dissolved oxygen caused by vegetation breakdown. It also notes that the remaining area of the
water body can be treated 10 to 14 days later.

Clipper Specifics!

Posted by | Clipper Information | No Comments


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.