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Celsius WG Herbicide

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Safe for use year round on the most important warm-season turf types

Celsius™ controls weeds at high temperatures, allowing the turf to reach its optimal density during the most favorable time of year for growing warm-season grasses. There is no better weed control than dense and healthy turf.

Unlike some other post-emergent herbicides, LCOs can feel confident applying Celsius because it is safe to use year round at high temperatures on St. Augustine and centipede turf without risk, damage, or fear of significant phototoxicity. Celsius is a post-emergent herbicide. With some pre-emergent control, Celsius also allows turf to release into areas where weeds once lived. Newest generation post-emergent herbicide. Celsius features two new actives - iodosulfuronmethyl- sodium and thiencarbazone-methyl - and gives turf managers a new tool for managing resistance to some existing post-emergent herbicides.

Target Pests

Celsius controls more than 150 weeds including Annual and Perennial Broad leaf Weeds and Grasses many difficult-to-control broad leaf and grassy weeds (see chart on reverse side for details).

For Use In

Warm-Season Turf Types Only (St. Augustinegrass Bermudagrass Centipedegrass Zoysiagrass) listed in this label in Commercial and Residential Sites NOT FOR USE on bahiagrass or cool-season turf types including tall fescue fine fescue Kentucky bluegrass perennial ryegrass or creeping bentgrass


Celsius is safe to use at high temperatures and gives LCOs the freedom to make post-emergent applications when it's convenient for them.

Coverage Area

Celsius has three use rates depending upon the weeds that are to be controlled. The annual use rate for weeds can vary from 2.5 - 4.9oz./acre in a single application to a maximum use rate of 7.4 oz/acre annually. Celsius uses 25-75 percent less active ingredient than current post-emergent herbicides. Exceptional control of broadleaf and grassy weeds, application convenience, flexibility and residual

Time to Kill

The soil activity of Celsius provides a barrier of control for up to 60 days after the application is made.

Mix Rate

For spot treatments only For spot treatment applications, add the specified Celsius rate of 0.057- 0.113 oz. (1.6-3.2 grams) to one gallon of water. Spray weeds to wet. One gallon of spray solution will treat up to 1,000 ft.2 Add 0.25% v/v of non-ionic surfactant (NIS) or methylated seed oil (MSO) in the spray solution. Not all spoons are alike. In order to ensure proper use rate, the spoon should be tested and weighed first. Use kitchen or cooking type measuring spoons. Use level teaspoon or tablespoon when measure out the celsius wg herbicide Low rate is 0.057 oz. or 1.6 grams per gallon water Middle rate is 0.085 oz. or 2.4 grams per gallon water High rate is 0.113 oz. or 3.2 grams per gallon water

Active Ingredient

Thiencarbazone-methyl 8.7% Iodosulfuron-methyl-sodium 1.9% Dicamba 57.4%

Celsius WG Herbicide

Quick Overview of Celsius WG

We are proud to carry Celsius WG in stock here at Solutions Pest & Lawn because it delivers exceptional results. Celsius WG provides one of the broadest spectrums of control on the lawn care market among post-emergent herbicides. Celsius WG can control more than 150 weeds, including many difficult-to-control broadleaf and grassy weeds. This product also boasts best-in-class safety on St. Augustine grass and centipede turf types.

◘Fantastic control on some of the most stubborn invasive weeds and grasses
◘Convenient application window without high temperature limitations
◘Low risk of significant phytotoxicity at high temperatures
◘Can deliver successful control using 25–75% less active ingredient than current post-emergent herbicides
◘Easy-to-use wettable granule formulation

Wild Carrot 

Celsius: The Answer For Weed Control On Warm-Season Turf

We know how frustrating it can be to deal with weeds creeping up on your lawn and sticking out like a sore thumb. Some weeds can be so stubborn and persistent that purchasing your average weed killer from the local big box store is just not going to cut it. The answer your problems comes in the form of one of the more popular herbicides created by Bayer Environmental Science known as Celsius.


Celsius WG is one of the best herbicide products on the market and delivers among the highest degree of weed control on warm-season turf. Celsius herbicide can be safely applied on your lawn any time of the year to protect a varied selection of warm-season turf types such as St. Augustinegrass, centipedegrass, bermudagrass, and zoysiagrass. Celsius provides outstanding control of troublesome broadleaf and grassy weed and can be conveniently applied. It is also touted on the lawn care market for its flexibility and long residual.


Benefits of Celsius WG

Lawn care professionals and DIY homeowners alike can feel confident applying Celsius even when temperatures are very high without worrying about the chances of phytotoxicity. This important product benefit gives lawn applicators the ability to control pesky broadleaf and grassy weeds during periods of high heat allowing the turf to reach its potential during the most favorable time of year for growing grass without having weeds take away their essential nutrients and outcompete them during the growing season. There is no better weed control than dense and healthy turf, which leads to happy customers and fewer reapplications.

Celsius provides a number of key benefits such as the broad spectrum control for more than 150 weeds, including doveweed, bull paspalum, large crabgrass, dandelions, and Virginia buttonweed among others.  Celsius gives both lawn care pros and residential DIYers the freedom to make post-emergent applications on a wide selection of weeds whenever it is convenient for them.  Before a product such as Celsius came along, the applying traditional post-emergent products had been grossly limited due to the restrictions of applying when temperatures were very high.

 Grassy Weeds

Contents of Celsius WG

Celsius WG combines the proven power of dicamba with two other exceptional active ingredients, iodosulfuron-methyl-sodium and thiencarbazone-methyl.  These two actives serve as a powerful tool for battling against weeds which have developed a resistance to herbicides.  With three different usage rates listed on the label, Celsius gives lawn owners and lawn care pros the flexibility to select the rate that is right for them depending on the size of their landscape and weeds which need to be addressed.  With the maximum application rate per season being 7.4 ounces per acre, Celsius uses 25 to 75 percent less active ingredient than other post-emergent herbicides.

As both a contact and systemic product, Celsius attacks weeds through both the shoots and the roots.  The soil activity of Celsius provides a barrier of control for up to 60 days laying out the herbicide treatment.  This allows for the product to release into areas where weeds have reduced the overall quality stand of turf.

How to Apply Celsius WG

Applicators and lawn care professionals have a number of different options when making post-emergent herbicide applications with Celsius. Circumstances such as spray equipment, the size of the area treated and the weed density within that area, determine which application method would be the best to follow.

Broadcast applications can be made to entire landscapes or smaller areas, typically known as zones. Broadcast treatments are made using a specific amount of product per acre, or per 1,000 square feet , and can be done with a handheld pump sprayer or a hose-end sprayer. It’s important that the applicator and the equipment be calibrated, so that the proper amount of product is delivered adequately to the area. Application methods include traditional broadcast applications, zone broadcast applications and spot treatment applications.

Backpack Sprayer
Application Method Breakdown

Traditional broadcast applications refer to applications made wherein the entirety of the property is treated with the herbicide to provide total weed control, regardless if it is needed or not.  

Zone broadcast applications refer to applications wherein a specific area is treated using broadcast method (i.e. spraying 5,000 square feet of a 20,000 square foot yard). Many lawn care professionals are moving towards zone broadcast applications when applying a post-emergent herbicide, like Celsius. This method helps to lessen chances of over applying the product and wasting unnecessary amounts, while at the same time, ensuring that surrounding weeds, not always visible, are treated.

Spot treatment applications refer to applications wherein a specific weed or group of weeds is treated with the herbicide in a spray-to-wet method. Typically done with handheld or backpack sprayers, spot treatment applications can also be done with small mechanical sprayers, such as a 25 gallon tank with a hose and nozzle. This method may bring the risk of over application, which can cause the turf to react negatively to the product and suffer from discoloration or stunted growth.When making spot treatment applications, proceed with caution and follow labeled rates closely.

O When conducting spot treatment applications with Celsius using equipment that is not mechanized, it is more difficult to accurately spray the proper rate. When Celsius is applied at rates found on the label for spot treatment applications, there is a specific amount of product recommended per gallon of water. Spray solution can be applied up to 1,000 square ft . When performing spot treatments, weeds should be sprayed to ensure adequate coverage of the herbicide while avoiding over application.

O If you choose to spot treat Celsius with a backpack sprayer, add the specified product rate of 0.057 - 0.113 oz (1.6-3.2g) to 1 gallon water. One gallon of spray solution will then treat up to 1,000 sq ft . Then, spray to wet, while avoiding over application. Addition of surfactants or adjuvents is not recommended.

To get the best possible results using Celsius, we recommend a zone broadcast application. Zone broadcast applications are the most effective way to treat weeds when it comes to both cost and effectiveness because the risk of overapplication is lessened, making it so turf is less likely to be damaged. This also reduces waste of the product while making it so weeds are not overlooked during the application.

Calibrating Your Sprayer For Applying Celsius

Calibration is a crucial preliminary task you must do before applying herbicide products because it helps to ensure that the exact, recommended amount of product per acre, or per 1,000 sq ft , is applied. Proper calibration is likewise vital to achieve the best performance with Celsius.

Using too little Celsius WG per area lead to unsuccessful weed control, while applying too much Celsius can result in wasted product and damaged turf grass due to toxic effects, known as phytotoxicity. Whether applying spot treatment applications via backpack, or spraying broadcast treatments, calibration is critical to achieve maximum weed control and turf safety.

Calibration for Broadcast Applications

The following instructions should be followed for proper calibration before conducting broadcast spray applications:

1. Determine the time it takes to be able to cover 1,000 sq ft.

2. Use a bucket which contains a measurement to determine how many gallons of water are delivered from your truck in the amount of time it takes the technician to cover 1,000 sq ft

3. Take the numbers from step 1 and 2 and calculate the amount of product to add to the treatment tank.

(For example: An applicator can covers 1,000 sq ft in 1 minute. The spraying rig on the truck delivers 3 gallons of spray mixture per minute. Your technician and truck are calibrated to deliver 3 gallons of spray per 1000 ft2 or 130 gallons of spray per acre (1 acre equals 43,560 sq ft. )

4. After calibration, refer to the product label to determine the amount of product to put into the tank.

Calibration for Spot Treatment Applications

Calibration can be difficult to determine for spot treatment applications. The most important thing is to achieve adequate coverage of the targeted area. Spray-to-wet and not over apply

Additional Application Guidelines

Adequate spray water volume is important when applying post-emergent herbicides, such as Celsius. With foliar spray applications, the spray solution behaves as the carrier of the active ingredients to the weeds, where they are absorbed and put a stop to plant growth. Insufficient spray volumes will result in poor coverage of the herbicide on the weed surface. Herbicide coverage is always of utmost importance in any application. Weed density, environmental conditions, and growth stage of the weeds should all be analyzed prior to making applications.

Application During Extremely Hot Temperatures

Celsius controls weeds faster, and can actually do a better job, during warmer weather conditions when plants are more actively growing. However, when turf grass is suffering from stress (i.e. over 90 degrees temperatures), Celsius has been known to cause temporary yellowing and/or stunting of turf grass. This typically occurs only if excessive application rates are used with spot applications. When dealing with stressful conditions like heat, we recommend zone broadcast applications over spot treatment applications to reduce negative turf reactions as much as possible.

Product Q & A

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Browse 17 questions Browse 17 questions and 21 answers
Your video demonstration said to dilute X grams of Celsius product per gallon. What would that be in Tablespoons or teaspoons for Virginia Button Weed in St. Augustine?
A shopper on Sep 26, 2017
BEST ANSWER: Use the Celsius to control Virginia Button weed 0.68 Teaspoons per gallon of water, to cover 1,000 square feet of area.
Should I apply before or after mowing?
Brenda B on Oct 1, 2017
BEST ANSWER: You will want to apply the Celsius after moving,
Is this herbicide safe on lawns used by small dogs (11 lbs)?
Nancy W on Nov 25, 2017
BEST ANSWER: Yes, Celsius WG will be fine to use on lawns where you have pets. You will want to keep them out of the area while applying and let it have time to completely dry.
the date on my bottle of Celsius is 11/2016. Has it expired?
A shopper on Sep 22, 2017
BEST ANSWER: Those would be manufacture dates or lot numbers, but it has not expired. We receive new shipments almost weekly.
Can I use on st. Augustine in the fall?
A shopper on Sep 16, 2017
BEST ANSWER: Celsius WG would be less effective if you apply it during the fall, as most weeds are going dorman.

Better to apply a pre-emergent in the fall and spring, then apply Celsius WG herbicide when the lawn is actively growing in the spring.

Will Celsius kill broadleaf weeds and grass in Bermuda?
A shopper on Oct 21, 2017
BEST ANSWER: Yes, Celsius WG is a Herbicide for the Control of Annual and Perennial Broadleaf Weeds and Grasses in Warm-Season
Turf Types (St. Augustinegrass, Bermudagrass, Centipedegrass, Zoysiagrass,)
Will it kill stickers?
A shopper on Dec 29, 2017
BEST ANSWER: https://www.solutionsstores.com/prodiamine-65-wdg-barricade-herbicide

I would recommend using a pre-emergent to control them before they start. After as a post emergent control of Stickers and other weeds you can use Celsius WG Herbicide for Control of Annual and Perennial Broadleaf Weeds and Grasses in Warm-Season
Turf Types (St. Augustinegrass, Bermudagrass, Centipedegrass, Zoysiagrass,) listed in this label in
Commercial and Residential Sites*
Can Celsius be used on st.augustine lawns?
David C on Aug 19, 2017
BEST ANSWER: Yes you can use Celsius WG on St Augustine grass. It can even be used during the hot summer months. It is a good product just expensive.
Does it expire??
A shopper on May 3, 2018
BEST ANSWER: No, Celsius does not have an expiration date and can be stored for up to 5 years without loosing effectiveness.
Is Celsius safe on horse pastures?
Arthur K on Mar 26, 2018
BEST ANSWER: No, Celsius WG is not labeled for use in grazed areas.

PRODUCT USES CELSIUS® WG HERBICIDE is a selective herbicide with multiple modes of action that provide a broad spectrum of
weed control. CELSIUS WG HERBICIDE controls weeds after they have germinated (post) and also has some residual
activity that prevents new weed germination, depending on the specific weed.
CELSIUS WG HERBICIDE is intended for foliar application by licensed commercial applicators to established turf including
residential lawns, commercial lawns, golf courses, sports fields, parks, campsites, recreational areas, roadsides,
school grounds, cemeteries, sod farms to control annual and perennial broadleaf weeds and grasses in certain warmseason
turf types.
I want to kill burrweed in my backyard , but I am scared I will kill what grass that I have. We have a mixture of grasses what the dogs haven't worn down so will Celisis WG just kill weeds or will it kill the grass?
A shopper on Mar 15, 2018
BEST ANSWER: This will all depend on the type of grass you currently have. The Celsius WG is a great product to use on warm season grass such as; St. Augustine grass, Bermuda, Centipede, Zoysia. Buffalo. A small tolerance test can be done before a full application. Temporary discoloration can occur to turf under stress from drought, disease or extream weather.
My lawn has weeds all through it. Can I spay over entire lawn?
A shopper on Mar 14, 2018
BEST ANSWER: Yes, of course you can apply to the entire lawn to control weeds, that is ideal. Warm-Season Turf Types Only (St. Augustinegrass Bermudagrass Centipedegrass Zoysiagrass) listed in this label in Commercial and Residential Sites NOT FOR USE on bahiagrass or cool-season turf types including tall fescue fine fescue Kentucky bluegrass perennial ryegrass or creeping bentgrass
What is the shelf life after opening bottle when stored in air-conditioned home in a closet?
A shopper on Mar 10, 2018
BEST ANSWER: You can store the item for 3 years without any diminished effects of the active ingredient in Celsius WG Herbicide.
How many oz of celsius would mix with 50 gals of water??
A shopper on Dec 6, 2017
BEST ANSWER: 2.5 to 5.9 ounces per acre application of Celsius WG herbicide. It depends on the level you decide to put out, low rate or high rate.
Do I have to use surfactant in 75 degree temp?
A shopper on Nov 27, 2017
BEST ANSWER: It is always advisable to use a surfactant with all herbicide applications, just will help it work better.
Will this product take care of annual blue grass .(poaunna)
Turfmedic on Mar 30, 2017
BEST ANSWER: The product that will work best for this weed will be the Revolver. It will provide the perfect coverage for this weed.
Should you water after applying Celsius herbicide
Dottie on Mar 6, 2017
BEST ANSWER: No you want it to completely dry and have a 4 hour rain fast time.

Customer Reviews

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Yes (1)
Easy to Use
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Would you Recommend?
Works great have no problem telling people that. The only problem is, its to expensive for home owners.
March 14, 2018
2 months ago
Very good product
It's a very good product for use on Centipede grass to get rid of weeds.
August 18, 2017
1 year ago

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