Celsius WG Herbicide - Questions & Answers

We would recommend that you apply Celsius WG as a post emergent control to treat doveweed in your St. Augustine lawn. Please refer to the product label for more detailed information on treatment.

Celsius is not labeled for sedge weeds. We recommend you choose a product that is labeled for sedge such as ProSedge Herbicide, Sedgehammer, or Dismiss Turf Herbicide. You can always check a product label before making a purchase on our website to make sure the weed you are trying to eliminate is listed. There is a link for the product label under the picture of the product on each individual product page.

Celsius is labeled for creeping beggarweed and when used as directed on the product label will do a great job helping you eliminate this pest weed.

The amount of surfactant you use with Celsius per gallon of water is going to depend on the brand of surfactant you use. It is recommended to use a non-ionic surfactant with Celsius. The two most common non-ionic surfactants we sell are Southern Ag Non-Ionic Surfactant or Hi-Yield Spreader Sticker. Please refer to the product page for each surfactant to determine how much needs to be mixed per gallon of water.  

As with most herbicides the exact volume of water is not very important, you just need to be sure you are getting the correct amount of product on a specific area. Celsius may be applied at three different rates depending on the weeds to be controlled. For the appropriate rate and species consult USE RATES FOR WEED CONTROL section on the Celsius product label. For spot applications, add the specified product rate of 0.057-0.113 oz (1.6-3.2g) to enough water to create approximately 1 gallon spray solution. One gallon of spray solution will treat up to 1,000 sq ft. For maximum weed control with broadcast applications, add non-ionic surfactant.

Depending on the weed you're treating, it could take anywhere from 1-4 weeks for you to see results with Celsius WG Herbicide. Weed control may be reduced if application is made in the prescense of heavy dew, fog, and mist/rain or when weeds are under stress due to a drought. For best results, do not irrigate until spray has dried. For maximum weed control with broadcast applications, add a non-ionic surfactant.

Celsius WG Herbicide should be applied with a pump sprayer or backpack sprayer when rain is not expected within 24 hours of application so you may need to reapply.  Keep in mind that it can take 1-4 weeks for the doveweed to die completely. 

Yes, a measuring device is provided with each purchase to dispense the correct amount of Celsius.

Celsius WG Herbicide is labeled to kill several species of clover.

The product label for Celsius WG does state: For maximum weed control with broadcast applications, add non-ionic surfactant (NIS) at recommended rate to the spray solution. For difficult-to-control weeds, add methylated seed oil (MSO) at a rate of 0.5-1% v/v to the spray solution.

Unfortunately, we no longer carry Celsius WG.  However, according to the product label, Celsius will become rainfast approx. 4-6 hours after application.  Runoff of this product will be reduced by avoiding applications when rainfall is forecast to occur within 48 hours.

Celsius WG Herbicide is labeled to treat for Johnsongrass.

Celsius does not kill or suppress annual bluegrass/poa annua. Please let us know what kind of turfgrass you have so that we can recommend a product that will work for your needs.

It could take 1-4 weeks in order for the doveweed to die completely. The speed will depend on varied temperatures and will be fasted in warmer temperatures. Weed control may be reduced if application is made in the prescense of heavy dew, fog, and mist/rain or when weeds are under stress due to a drought. A second application of Celsius can be made 2-4 weeks after the first treatment. Please let u sknow if you have any additional questions.

As long as the temperature during the application of the Celsius WG Herbicide  is not 85 degrees or above, then it does not matter what temperature it reaches mid day. The best time to apply herbicides is either early morning when dew is still fresh on the ground or late afternoon when the lawn and weeds are under less stress from the environment. Temperatures over 85 degrees will cause extra stress on your desirable turf, possibly causing damage.

Celsius is not labeled to be tank mixed with Image or Certainty. It can be tank mixed with the following products: Revolver, Ronstar Flo, Ronstar WSP, Sencor, Prograss, Acclaim Extra, Illoxan or Finale.

With Celsius WG Herbicide, you will use .113 oz. of product per gallon of water. This product is labeled for use in bermuda grass so no it will not harm your grass.

Cesius is only labeled to control Large Crabgrass and there are other varieties such as hairy and smooth that are not on the label as listed weeds it will control.  That could be why some are not having the success they would when using for the specific type of crabgrass they have.  Unfortunately, we are unaware of a selective post-emergent herbicide to control crabgrass in a St Augustine lawn.  St. Augustine is a very fragile grass, and so most selective products that are labeled to remove crabgrass and not harm your grass.  It is recommended to kill the crabgrass with a round up type product, like GlyPhoSel Pro, which will also kill just the St. Augustine around the crabgrass that it is sprayed on, and then a couple weeks later re-seed those areas with new St. Augustine.

For long term control though, you should apply a pre-emergent in the late fall and early spring which will prevent new crabgrass from coming up next year.  If you apply pre-emergent every year, you should not have issues with crabgrass long term.  Dimension 2EW is one of our most popular pre-emergents for crabgrass.

Celsius WG Herbicide works best when soil temperatures are above 65 degrees per the product label.  Symptom development may be slow in weeds treated under cool conditions (soil temperatures 65 degrees or less)