Gain access to personalized product screening, the best pricing, rewards, and more!
Create An Account, Or Sign In.
Your Product Analysis:
Home
Grass
Property
Kids or Pets
You Need:
$5.00
For your -- home1
Your Cost:
Your Cost:
$5.00
Price per
application2
application2
QUALI-PRO
Oxadiazon 2G Pre-Emergent Herbicide (Ronstar)
Oxadiazon 2G Pre-Emergent Herbicide is a pre-emergent herbicide designed to selectively control various types of annual grasses and broadleaf weeds without harming turfs, ornamental shrubs, or trees. It was previously called Ronstar Herbicide.
Only %1 left
SKU
Oxadiazon 2G Ronstar Product Page
Min : 119.31 - Max : 119.31
+
Price as of
09/21/25
09/21/25
Price Transparency
See how our pricing compares to other online retailers for this item.
This product is a Restricted Use Product (RUP) and requires a Certified Applicator's License to purchase.
Oxadiazon 2G Pre-Emergent Herbicide, manufactured by Quali-Pro, is a selective pre-emergent herbicide designed to fight weed seeds and prevent them from growing in established or newly seeded turf.
The same mode of action and low-odor granule as Ronstar, with the exception of the granules being larger in size for better distribution and visual confirmation in the treatment area. This granule herbicide contains the active ingredient oxadiazon 2.0%, which kills seeds of targeted weeds underneath the soil rapidly for excellent coverage and control.
Oxadiazon 2G Pre-Emergent Herbicide is a long-lasting pre-emergent herbicide that controls weeds and grasses through the shoot without harming the roots of desired foliage. It can readily be applied to established and newly transplanted plants, as well as actively growing or dormant plants.
Tools Needed
A handheld, push, or professional tow-behind broadcast spreader is needed. A push spreader is recommended for smaller turfs, and a handheld spreader is suggested for small spot treatments.
How to Use
- Step 1: Determine how much Oxadiazon 2G Pre-Emergent Herbicide (Ronstar) to use by measuring the square footage of the treatment area. Find this square footage by measuring the length and width of the treatment area in feet and multiplying them together (length X width = square footage). For acreage, divide the square footage by one acre (square footage / 43,560 sq. ft. = acre). Depending on your turf species, you may use anywhere from 2 1/4 to 4 1/2 lbs. per 1,000 sq. ft. or 100 to 200 lbs. per acre, depending on the weed you wish to treat. For St. Augustinegrass, do not exceed 150 lbs. per acre.
- Step 2: Fill your selected spreader with the correct amount of granulated herbicide and adjust the spreader settings to the proper calibration for your spreader type.
- Step 3: Push the spreader around the perimeter of the turf at a steady pace and work your way to the middle, dispersing the granules evenly to dry foliage. Water the treated areas as soon as possible after the application process. For continued weed control, additional application of Oxadiazon 2G Pre-Emergent Herbicide (Ronstar) may be made 60 to 120 days after the previous application for labeled established container-grown plants, newly transplanted container-grown, field-grown established and newly transplanted plants.
Where to Use
Oxadiazon 2G Pre-Emergent Herbicide (Ronstar) can be applied to annual grasses and broadleaf weeds in commercial turf and woody ornamental shrubs, vines, trees, fairways, parks, and golf courses.
This product may be used to treat commercial turf, such as perennial Bluegrass, Bermudagrass, perennial Ryegrass, St. Augustinegrass, tall fescue, and Zoysia turf.
Not for use on home lawns.
When to Use
The right time to use Oxadiazon 2G Pre-Emergent Herbicide (Ronstar) varies, depending on the type of vegetation being controlled and where applications will be made. For the best results when treating turfs, Oxadiazon 2G should be applied to the label during early spring before the germination of weed seeds.
When applying Oxadiazon 2G to woody ornamental shrubs, vines, and trees, applications can be made anytime during the year before weed germination begins.
Do not apply this product to newly seeded areas. Seeding into treated areas should be delayed until 4 months after treatment.
Safety Information
Oxadiazon 2G Pre-Emergent Herbicide (Ronstar) is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when applying and handling this product.
Keep children and pets out of treated areas for at least 24 hours.
Special Considerations
Discoloration of Bermudagrass and St. Augustinegrass may result from the use of this product, but this discoloration is temporary and normally outgrown within 2 to 3 weeks.
| Availability | Online |
| Restricted Use | Yes |
| Shipping Restrictions | 50 Pound: AK, CT, HI, MI, NY, OR, RI, SC |
| Brand | QUALI-PRO |
| Keith's Pro Tips | "When treating St. Augustine grass turf, do not apply more than 150 pounds per acre. Also, temporary discoloration of Bermuda and St. Augustine grass may occur from applying Oxadiazon 2G and will grow out within 2 to 3 weeks." |
| Product Drawbacks | Oxadiazon 2G is restricted and cannot be purchased or applied by those who are not certified applicators and it is not approved for residential lawns. For DIY homeowners, we recommend using TopShot Weed Killer. It is safe for residential lawns and control |
| Target Pests | Oxadiazon 2G controls the following: Bluegrass, Barnyardgrass, Bittercress, Carpetweed, Common Groundsel, Common Purslane, Crabgrass, Eveningprimrose, Fall Panicum, Galinsoga, Golden Ragwort, Green Foxtail, Lambsquarters, Pennsylvania Smartweed, Petty Spurge, Redroot Pigweed, Speedwell, Spotted Catsear, Swinecress, and Yellow Woodsorrel. |
| Application Equipment | Gloves, Push Spreader |
| Application Methods | Granular Spreading |
| Active Ingredient | Oxadiazon- 2.0% |
| Product Type | Herbicide |
| Formulation | Granular |
| Application Rate | Oxadiazon 2G is a ready-to-use fertilizer and does not require mixing. |
| Shelf Life | Oxadiazon 2G will last up to 1 to 2 years when stored according to the product label. Store Oxadiazon 2G in a cool, dry storage area. |
| Yield | The application rate varies depending on the type of annual grass or broadleaf weed being controlled and where the application is made. For commercial turf treatments, a 50 pound bag of Oxadiazon 2G will treat up to 10,890 square feet or 1/4 of an acre. |
| Use Sites | Outdoors |
| Time to Kill | Oxadiazon 2G kills seedling during the germination period when contact is made after application. |
| Comparable Products | Ronstar G Herbicide |
| Use Caution With | Bentgrass, Zoysiagrass |
| EPA Registration # | 53883-372 |
| Restricted Use | Yes |
|---|---|
| Shipping Restrictions | AK, CT, HI, MI, NY, OR, RI, SC |
| Availability | Online |
| Signal Word | WARNING |
| Keith's Pro Tip | "When treating St. Augustine grass turf, do not apply more than 150 pounds per acre. Also, temporary discoloration of Bermuda and St. Augustine grass may occur from applying Oxadiazon 2G and will grow out within 2 to 3 weeks." |
| Target Pests Multi | Annual Bluegrass, Barnyardgrass, Bittercress, Carpetweed, Common Groundsel, Common Purslane, Crabgrass, Evening Primrose, Fall Panicum, Galinsoga, Golden Ragwort, Green Foxtail, Lambsquarters, Pennsylvania Smartweed, Petty Spurge, Poa Annua, Redroot Pigweed, Speedwell, Spotted Catsear, Swinecress, Yellow_Woodsorrel |
| Time to Kill | Oxadiazon 2G kills seedling during the germination period when contact is made after application. |
| Chemical Type | Herbicide |
| Formulation | Granular |
| Application Methods | Granular Spreading |
| Product Drawbacks | Oxadiazon 2G is restricted and cannot be purchased or applied by those who are not certified applicators and it is not approved for residential lawns. For DIY homeowners, we recommend using TopShot Weed Killer. It is safe for residential lawns and control |
| Active Ingredient | Oxadiazon- 2.0% |
| Application Equipment | Gloves, Push Spreader |
| Mix Rate | Oxadiazon 2G is a ready-to-use fertilizer and does not require mixing. |
| Use Sites | Outdoors |
| Yield | The application rate varies depending on the type of annual grass or broadleaf weed being controlled and where the application is made. For commercial turf treatments, a 50 pound bag of Oxadiazon 2G will treat up to 10,890 square feet or 1/4 of an acre. |
| EPA Registration No. | 53883-372 |
| Shelf Life | Oxadiazon 2G will last up to 1 to 2 years when stored according to the product label. Store Oxadiazon 2G in a cool, dry storage area. |
| Comparable Products | Ronstar G Herbicide |
| Children or pets? | No |
| Property Characteristics | None |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.