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Prnum Pesticide(MFG) Commodity (Crop Group) Category (Code) EPA Status 13974 + PYROXASULFONE KICHEM BLUEBERRY (HIGHBUSH) (13-07B = BUSHBERRY SUBGROUP) POTENTIAL: E/CS DATA BEFORE APPROVAL FOR RESIDUE STUDY (02) Reasons for need: Many winter grasses (Italian ryegrass, annual bluegrass), yellow nutsedge, many annual broadleaf weeds (pigweeds, Conyzas, groundsel). Need to expand options for sedges and grasses. Only Dual Magnum is labeled in this MOA (Group 15), and Devrinol (not widely used):06/25; MI: Nutsedge & to control grasses:06/25; MI: Expands Group 15 options beyond Dual Magnum, and would improve management of sedges and resistant grass populations in highbush blueberries:08/25; FL: Lack of management options for grasses and nutsedge:08/25; NJ: S-metolachlor (Dual Magnum) is only available for use in NJ blueberry through a 24(c) label. Limited options for effective grasses and sedges control. Use of indaziflam increase selection pressure on sedges, increasing the need for an effective management option such as pyroxasulfone:09/25; Efficacy/Crop Safety (E/CS) Data Required: E/CS Research Comments: Comments: Key Export Markets: Asia, Canada, EU; EPA CAUTION:08/25; during the 2025 FUW, Kumiai supports as Potential: E/CS Before Approval for Residue:09/25/sb; Field Res.Dir (FRD) Field ID# Field Data Track# Raw Data Data to MFG Performance Results & Comments Moretti, Marcelo 25-OR-DMP RECD 5958.pdf 08/25 Pyroxasulfone was applied early March at 146, 292, 584, or 1,170 g ai/ha post-directed along both sides of the rows and across lower 2 feet of well-established ‘Elliot’ highbush blueberries. Each pyroxasulfone treatment included 1,150 g ai/ha glufosinate. Treatments also included glufosinate alone at 1,150 g ai/ha, for comparison. No crop injury observed from any treatment through 5 months after treatment (MAT). At 4 MAT, good to excellent control of smartweed, Northern willowherb and fescue seen from all pyroxasulfone treatments, with the exception of smartweed control from the lowest rate. Yield from pyroxasulfone treatments was not different from glufosinate alone.