Comment submitted by Aaron Patton

EPA, I am writing to express my support for the registration of Rinskor active (florpyrauxifen-benzyl) for turf and ornamental (T&O) uses. I have been working with this molecule for about 10 years through various tests on different weed species and turfgrasses. My research at Purdue is focused on turfgrass management practices including weed management and ecology. As a Professor and Turfgrass Extension Specialist at Purdue University, I believe Rinskor represents a critical advancement in sustainable weed management for the following reasons: Exceptionally Low Use Rates: Rinskor is effective at rates far lower than traditional herbicides used in T&O, significantly reducing the chemical load on the environment. Combatting Herbicide Resistance: It offers a novel mode of action (Group 4 arylpicolinate) for T&O that controls weeds already resistant to other herbicides while increasing the sustainability of current options. The Rinskor-containing products, GF-3565 T&O (proposed tradename CenterCourt Herbicide; florpyrauxifen-benzyl + penoxsulam) and GF-4676 T&O (proposed tradename KurtainCall Herbicide; florpyrauxifen-benzyl + fluroxypyr), have proven highly effective against key residential turf weeds including dandelion, buckhorn plantain, broadleaf plantain, white clover, ground ivy, black medic, doveweed, chickweed, and sedge, with an excellent safety margin on Kentucky bluegrass. Notably, florpyrauxifen-benzyl is capable of controlling populations of buckhorn plantain that have developed resistance to 2,4-D, addressing a growing weed management challenge for which few alternatives currently exist. Favorable Safety Profile: My understanding (I am not a toxicologist) is that Rinskor has a favorable toxicological profile for mammals and birds and breaks down rapidly in soil and water, minimizing long-term residues. The US EPA granted a full tolerance exemption in 2019 (Docket ID: EPA-HQ-OPP-2018-0645) and has designated Rinskor as a Reduced Risk molecule in Rice, Aquatics, and Turfgrass. I ask the EPA to move forward with the registration of Rinskor for T&O to provide turfgrass managers, lawn care operators, golf course superintendents, homeowners, and consumers with these essential reduced-risk tools for maintaining and enhancing the quality of our outdoor spaces. Sincerely, Aaron Patton