Ronstar G Herbicide

4.5 out of 5 stars 10 Reviews | 18 Q&A

Ronstar G Herbicide

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Average Rating

4.5 out of 5 stars Rating: 4.6

10 Reviews | 18 Q&A

Product Overview

Ronstar G is for commerical applicators only

Ronstar G is a pre-emergent herbicide that controls a variety of annual broadleaf and annual grass weeds. Offering a conducive environment for sprigging, Ronstar controls weeds through their shoots rather than their roots, so it won't harm turfgrass roots in the process. In fact, Ronstar can be used for long residual pre-emergent weed control even in areas that may need to be sprigged or where turfgrass roots are already weakened due to pest, mechanical or other damage.

Features and Specs

Active Ingredient Oxadiazon 2%
Target pests Crabgrass, Goosegrass, Field Sandbur, Annual Sedge, Annual Bluegrass, Virginia Buttonweed, Pigweed, Florida Pusley, Oxalis, Stinging Nettle, Carpetgrass and others
See Label for complete list
For use in Established Perennial Turf-grass: Bluegrass, Bertgrass, Bermudagrass, Buffalograss, Perennial Ryegrass, St. Augustine grass, Seashore Paspalum, Fall Fescue, and Zoysiagrass, Commercial Nurseries and Commercial Landscapes
Application * See label for complete application instructions
Pet safe Yes, if used as directed on Label
Formulation Professional Product
NY - Restricted to Commercial Applicators
Shipping Weight 50.75 lbs
Manufacturer Envu (Formerly Bayer)
UPC 706927860139
EPA Registration 432-886


Q: What's a DNA? And what makes Ronstar's mode of action unique?
A: Dinitroaniline (DNA) herbicides control weeds by halting root growth. But these products don't distinguish between weed roots and turf/ornamental roots, so they can inhibit turfgrass and ornamentals in treated areas. Another problem with these products has been herbicide resistance by goosegrass. Ronstar, on the other hand, contains the active ingredient oxadiazon, and is not in the DNA chemical class. Ronstar controls weeds through the shoots, not the roots. It does not harm turf and ornamental roots and is effective against DNA-resistant goosegrass.

Q: Is Ronstar effective on goosegrass and crabgrass?
A: Yes. However, it must be applied prior to emergence. Ronstar's performance is not significantly affected by temperature, and it will not lose its effectiveness if it's applied early. In fact, the opposite is true—an early application ensures excellent crabgrass and goosegrass control.

Q: Does Ronstar control Poa annua (annual bluegrass)?
A: Yes. Just one application of Ronstar provides control that's equal to or better than other products registered for use on Poa annua.

Q: What's the best way to ensure effectiveness after Ronstar is applied?
A: Thoroughly water the treated areas soon after it's applied. Water only the soil and don't incorporate the chemical by raking; Ronstar works best when the soil surface is not disturbed.

5 stars   8
4 stars   1
3 stars   0
2 stars   1
1 star   0
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Sort Reviews
  • 2 of 5 Stars

    application rate

    By Bob on 02/12/2013

    Might be good to indicate the square footage this 50 Lb. sack will cover?

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    21 of 35 people found this review helpful

  • 5 of 5 Stars

    my purchase of Ronstar G-50 lb. bag

    By Thomas on 03/09/2012

    Verified Purchase

    All my orders were recieved very fast. They were shipped Free. Thanks for this service.Good job.

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    7 of 17 people found this review helpful

  • 5 of 5 Stars

    Rostar G

    By Dave on 03/02/2017

    Best product on the market and will use again for sure!!!!!!!!!!

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    6 of 8 people found this review helpful

  • 5 of 5 Stars

    Recent orders all 3.

    By Thomas on 03/28/2012

    Verified Purchase

    This is a very good company to do business with. The items were shipped very quickly. all arrived with in 3 to 5 days . The shipping was FREE.Thanks for the great service.

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    5 of 12 people found this review helpful

  • 5 of 5 Stars

    Feedback on order

    By Thomas on 04/15/2012

    Verified Purchase

    I recieved this item very fast. The item was just as advertised. Thanks for the great service.

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    5 of 12 people found this review helpful

See all 10 customer reviews

Questions & Answers

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Sort Questions
Is Ronstar G toxic to pets and children?

If so, how long should the treated area be off limits? If the product was to enter a water source such as a pond, is it toxic to the fish?

Ronstar must only be used by commercial applicators and cannot be used on residential turfgrass. Applicators can apply Ronstar to landscape beds in residential areas. After the product has been applied, people and pets must wait until after the product has been watered in before they return to the treated areas. Ronstar is toxic to fish and other aquatic animals and should not be used in areas where runoff or direct application could enter the water. For more information on Ronstar please read the Ronstar Product Label.

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35 of 42 people found this answer helpful

How many square feet does one 50lb bag of Ronstar cover?
This will really depend on what you are treating for. In general one 50 lb bag will cover 11,000 sq ft - 22,000 sq ft. You can review the Ronstar product label to find the usage rate that fits your needs.

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28 of 29 people found this answer helpful

How much water is sufficient when watering in Ronstar G - 50 lbs.?

How much water is required/sufficient to water this in? Will product still be visible on the surface of the dirt if properly watered in?


Be sure the you irrigate at least 1/2 in of water after Ronstar G - 50 lbs. application. The water will activate the granule, and then it should no longer be visible. 

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19 of 19 people found this answer helpful

Can RonStar be applied at the same time as fertilizer?

You can apply a fertilizer either right before or right after applying RonStar G, you just cannot apply them together at the same time.

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17 of 17 people found this answer helpful

Is there any product that will neutralize ronstar? ( or pre-emergent weed ?)

We have a small dog & he developed a liver problem. How can we prevent recurrence?

We suggest you direct your question to the manufacturer.  The manufacturer is Bayer and they can reached at: Product Info Line: (800) 331-2867

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13 of 16 people found this answer helpful

See all 18 customer questions

Ronstar G Herbicide 4.5 out of 5 stars Rating: 4.6 (10 Reviews / 18 Q&A)

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