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Oxadiazon Usage & Label Changes FAQs

The EPA recently conducted a scheduled review of the active ingredient oxadiazon, resulting in some upcoming usage and label changes to products containing oxadiazon. This has raised some common questions about the future use of this popular herbicide.

This guide assists distributors and turf managers in implementing the changes, understanding which products are affected, and identifying associated timelines.

Q. Oxadiazon will soon be listed as a Restricted Use Pesticide (RUP). What does that mean for distributors and turf managers?

A. Restricted Use Pesticides can only be sold to certified/licensed pesticide applicators, so distributors must confirm with those looking to purchase products containing oxadiazon. Turf managers who wish to purchase/use products containing oxadiazon must be licensed or certified by their state entities. Check with your state pesticide regulatory authority for any documentation requirements or procedures.

Q. Will labeled use rates change for oxadiazon products?

A. Yes. For all use sites, granular oxadiazon product applications are limited to a maximum of 3 lbs. AI per acre per app (lbs. AI/acre/app) with a maximum of two separate applications. In golf situations only, if “heavy weed pressure” is present, the per-application maximum is increased to 4 lbs. AI/acre.

Q. What other use instructions will be changed?

A. The minimum retreatment interval has been reduced to 60 days for all use sites, and product must be watered in directly after application. For golf use sites, only 30% of managed turf acreage can be treated per year. The treated area can change from year to year. “Managed turf acreage” is loosely defined as all turf areas on a golf course property: rough, tees, greens, fairways, clubhouse lawns, etc.

Q: Once label changes are implemented, what should be done with the existing “old-labeled” inventory?

A: Distributors can sell “old-labeled” inventory for 270 days after new labels are issued by EPA. After 270 days, distributors can sell old-labeled inventory with an amended/stickered label (provided by The Andersons). Once newly-labeled or amended/stickered oxadiazon products are stocked, those inventories can only be sold to certified/licensed end-users. During the initial 270-day period, old- and new-labeled products can exist side-by-side with use/sale directions tied to the label on the bag. 

Turf managers can store and apply old-labeled product in perpetuity. If a turf manager acquires new-labeled products, this does not override the use instructions of old-labeled products. Any new-labeled product must follow RUP regulations for application and documentation.

Q: Which products from The Andersons will be affected by this change?

  • Goosegrass Crabgrass Control
  • Oxa-Pro™ 2G 
  • 15-5-10 + 1% Ronstar 
  • 5-0-15 + 1% Ronstar
  • 5-5-20 + 1% Ronstar
  • 22-0-10 + 1% Ronstar 
  • 22-4-11 + 1% Ronstar 
  • 22-0-0 + 1% Ronstar
  • 8-4-24 + 1.38% Ronstar 
  • 21-0-20 + 1.38% Ronstar
  • 0-0-22 + 0.125% Dimension
  • 22-0-16 + 0.125% Dimension 
  • 36-0-0 + 0.125% Dimension

Q: What is the timeline for implemented changes?

Q: Where do I go with additional questions?

A: Because laws vary by state, please reach out to your local pesticide regulating agency for further questions regarding RUP regulations. For product use questions, please contact your Territory Manager from The Andersons. For updated labels, visit our products page.

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About the Author

Ben Pease, PhD

Ben Pease is the Agronomist for The Andersons Turf & Specialty business, responsible for research, service, and technical support. Ben received both his bachelor's and master's degrees from the University of Wisconsin, and earned his doctorate degree from Iowa State University. Ben has also served as the Assistant Superintendent for Cherokee Country Club (Madison, WI) and Whistling Straits Golf Courses (Sheboygan, WI). 

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