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Oxadiazon 2G Pre-Emergent Herbicide (Ronstar)

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Oxadiazon 2G Herbicide (Ronstar G) from Quali-Pro provides selective pre-emergent control of annual grassy and broadleaf weeds in turf and ornamentals. Oxadiazon is the same as Ronstar G from Bayer in an easy to apply granular formulation.

Target Pests

Oxadiazon is primarily use to control Goosegrass. It may also be used on a variety of grassy weeds such as grabgrass sandbur sedge virginia buttonweed pigweed pursley nettle and carpet grass. For a complete list of weeds controled by Oxadiazon please see the label.

For Use In

Oxadiazon can be used on turf grasses woody ornamentals commercial nurseries landscape ornamentals and golf courses.


Apply oxadiazon at a rate of 4lb per 1,000 square feet.

Coverage Area

Each 50lb bag of Oxadiazon 2G will treat 1/4 acre or 12,000 square feet.

Time to Kill

Pre-Emergent control.

Active Ingredient

Oxadiazon 2%

Oxadiazon 2G Pre-Emergent Herbicide (Ronstar)

Product Q & A

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Browse 9 questions Browse 9 questions and 9 answers
will this kill the hundreds of palm seedlings in my front yard?

We've already removed the tree.
A shopper on Sep 30, 2018
BEST ANSWER: Yes, it will prevent any seed from germinating.
Can you ship to the uk?
A shopper on Sep 19, 2018
BEST ANSWER: You can place your order on our website. We will ship internationally but we cannot be responsible if customs holds your product.
Can I use this on my Bermuda greens?
Dave R on Mar 8, 2018
BEST ANSWER: For use in established perennial Bluegrass, Bermudagrass, perennial Ryegrass,
St. Augustinegrass, Tall Fescue, and Zoysia turf; such as fairways, parks, golf
courses, and lawns. Quali-Pro Oxadiazon 2G controls Crabgrass (digitaria spp.),
Annual Bluegrass (Poa annua), Goosegrass (Eleusine indica); and it also controls
Florida Pusley (Richardia scabra), Oxalis (Oxalis spp.), Stinging Nettle (Urtica
dioica), Carpetgrass (Axonopus offinis), and Pigweed (Amaranthus spp.).
Apply to dry foliage only with a properly calibrated granular applicator at recommended
rate in early spring before weed seed germination. If rain is not expected
shortly after application, irrigation to remove herbicide granules from foliage will
increase effectiveness.
For Crabgrass, Goosegrass, and Crowfoot control, apply 100-200 pounds Quali-Pro
Oxadiazon 2G per acre (2 to 4 pounds active ingredient) or 2 1/4 to 4 1/2 pounds
per 1000 sq. ft. Late applications are not recommended and may not be fully effective.
For Annual Bluegrass control, apply 200 pounds/acre Quali-Pro Oxadiazon 2G (4
pounds active ingredient) or 4 1/2 pounds/1000 sq. ft. in early spring or late summer
prior to seed germination.
For Pigweed, Florida Pusley, Oxalis, Stinging Nettle, and Carpetgrass control, apply
200 pounds/acre Quali-Pro Oxadiazon 2G (4 pounds active ingredient) or 4 1/2
pounds per 1000 sq. ft. in early spring prior to weed seed germination.
For St. Augustinegrass turf, DO NOT exceed the rate of 150 pounds/acre (3 pounds
active ingredient) of Quali-Pro Oxadiazon 2G.
Discoloration of Bermudagrass and St. Augustinegrass may result from use of this
herbicide, but this discoloration is temporary and normally outgrown within 2 to 3
How long can I wait to water in ronstar herbicide?
Keith H on Mar 1, 2018
BEST ANSWER: For best result, you are wanting to water the product as soon as it is applied.
Is this product safe for bees?
A shopper on Feb 27, 2018
BEST ANSWER: The Oxadiazon is a selective pre-emergent herbicide and will not cause any effect to insects.
Can you seed after you apply ronstar 2g?
A shopper on Jan 25, 2018
BEST ANSWER: No, you cannot germinate seed after application of Ronstar 2G it is a pre-emergent and will prevent germination.
Can it be used on costal?
A shopper on Jan 14, 2018
BEST ANSWER: Sorry, not sure I understand the question are you asking about coastal bermuda application?
How to apply ronstar?
KAZIM T on Nov 30, 2017
BEST ANSWER: Quali-Pro Oxadiazon 2G is a selective, pre-emergent herbicide for control of annual
grasses and many broadleaf weeds in commercial turf and on a wide variety of
woody ornamental shrubs, vines, and trees. Quali-Pro Oxadiazon 2G controls
weeds by killing the young weed seedlings as they come in contact with the herbicide
during germination.
For best results, water-in the product as soon as practical after application.

Rates will depend on where you are applying, you can find all rates listed on the product label that is located as a PDF under the image.
Can you ship this product to California?
A shopper on Oct 29, 2017
Oxadiazon 2G can be shipped to CA.

Customer Reviews

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Outstanding Weed Control
We were first introduced to Ronstar by a contractor who built a house for us in California. Home completed in October, construction grading left bare earth around our home. Landscaping to occur in the Spring.Our contractor warned us that weeds would pop up in the Spring and we wouldn't be happy. He recommended Ronstar. We purchased some and applied it per instructions. The following Spring - no weeds!That was 1990, and to date we have consistently used this product over the years with great success. A friend, who retired as a landscape Gardner at our state Capitol confided to me that they too use Ronstar for weed control.We now own a home in another state and Ronstar is a part of our routine there. It works on the lawn without destroying it and amongst established plants as well.Use of the product reduces labor and we've never paid a cent for a Gardner.We have been customers of Epest Solutions for several years now and find their price the cheapest and items shipped quickly....they've earned our respect and continued business.
October 27, 2015

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