Ronstar 50 WSP

Ronstar 50 WSP
Ronstar 50 WSP

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Product Overview

Ronstar 50 WSP is a uniquely formulated herbicide designed to control weeds through the shoots and not the roots. Unlike rival products that do not differentiate between roots of desirable plants and roots of weeds, this specific product has no harmful effects towards healthy turfs. This product can be applied to sensitive and delicate grasses even within areas where pests, winterkill, or injury has already weakened the roots. This formulation contains Oxadiazon as an active ingredient which is not a Dinitroaniline (DNA) chemical class making it an effective choice against DNA-resistant goosegrass. It does not restrain recovery and regrowth of turf. It can also be used as a pre-emergent control since it is not significantly affected by the change in weather condition and temperature, and it will remain effective even if it is applied prior to emergence. This gentle yet potent herbicide works all season long and allows a conducive environment for sprigging. This particular product comes in a bag containing two 1 lb. bags of water soluble packets.

This product is only labeled for use on Residential Properties by a Professional Applicator.  The packets cannot be broken down into smaller applications.

Features and Specs

Active Ingredient Oxadiazon 50%
Target pests Bittergrass, bristly oxtongue, carpetweed, cheeseweed, common groundsel, common purslane, evening primrose ragwort, lambsquarters, sow thistle, speedwell, spotted catsear, swinecress, yellow woodsorrel
Please see Label for complete list
For use in Woody Ornamental Shrubs and Trees, Conifer Nurseries, and Ornamentals on Commercial, Residential, Roadsides, Industrial sites, Public Parks and Recreational areas
Application Two 1 lb. water-soluble packages come sealed in a plastic lined paper bag
Do not break the seal until the time of use
Do not use a knife or other sharp object to break the seal
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Shipping Weight 2.13 lbs
Manufacturer Envu (Formerly Bayer) (Mfg. Number: RONSTAR007)
EPA Registration 432-893



  • Apply prior to weed seed germination as a directed spray to the soil surface or as an over-the-top application on tolerant ornamentals used as ground cover listed on this label.
  • It can be applied to both newly transplanted and established plants. The application can be made to actively growing or dormant plants. However, apply prior to bud break or not until 4 weeks after bud break.
  • Rainfall or irrigation (one-half inch) immediately after application of the product will improve weed control and move it into the upper soil profile. Cultivating or disturbing the soil after application may reduce weed control by disrupting the herbicide barrier.
  • Apply a minimum of 50 gallons of water per acre (1.14 gallons of water per 1000 square feet). Remove existing weeds before application.
  • Apply a maximum of 8 water-soluble packets per acre or 4 lbs. a.i./acre as a single application. The maximum number of applications that may be made per year is two.
  • The maximum single application rate is 4 lbs. a.i./acre. A subsequent application can be made 4 months after previous treatment. For over-the-top sprays, irrigate within 2 hours after application, otherwise, injury to the ornamentals may result.


Annual Broadleaf Weeds:

Bittercress, Bristly Oxtongue, Carpetweed, Cheeseweed, Common Groundsel, Common Purslane, Evening Primrose, Fiddleneck, Fireweed, Florida Pusley, Galinsoga, Golden Ragwort, Lambsquarters, Liverwort, Oxalis, Pennsylvania Smartweed, Petty Spurge, Prostrate Spurge, Redroot Pigweed, Shepherdspurse, Speedwell, Sow Thistle, Spotted Catsear, Swinecress, Yellow Woodsorrel.

Annual Grasses:

Annual Bluegrass, Annual Sedge, Barnyardgrass, Carpetgrass, Crabgrass, Fall Panicum, Goosegrass, Green Foxtail, Ripgut Bromegrass, Wild Oats.

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Questions & Answers

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Can I use Ronstar 50 WSP in the production of rice?

No Ronstar 50 WSP is not labeled to be used on any edibles.  We do carry products that can be applied to edibles. Please click on the link below for more information on those products. Please check the product labels to ensure what you are treating is listed on the label.

Herbicide Weed Killers for Edible Gardens

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Can Ronstar 50 WSP be applied to established tall fescue and ryegrass lawns to control crabgrass and dallisgrass?

Ronstar 50 WSP is only for use in dormant  or established Bermudagrass, St. Augustine, and Zoysia turf.  It cannot be used on any cool season turf such as fescue or ryegrass.  Dimension 2EW would be a better option for all turf types.

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Can Ronstar 50 WSP be applied to established turf only while it is dormant?

Per the product label, Ronstar 50 WSP is for use in dormant, established Bermudagrass, St. Augustinegrass and Zoysia turf such as fairways, parks, golf courses and lawns.

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How much Ronstar 50 WSP do I need for 1 gallon of water to treat 1000 sq. ft.?

Ronstar 50 WSP is only labeled for use on residential properties by a professional applicator.  The packets cannot be broken down into smaller amounts. 

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