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Prnum Pesticide(MFG) Commodity (Crop Group) Category (Code) EPA Status 13723 + PYROXASULFONE KICHEM CARROT (01AB = ROOT VEGETABLES SUBGROUPS) UNDER EVALUATION (06) Reasons for need: WEEDS. Annual grassweeds, Broadleaf weeds, Weeds are a persistent problem for carrot production as carrots are poor competitors. Herbicides are essential for carrot production as high-density planting limits the use of mechanical options. Therefore, carrot growers have long relied on herbicides like metam, trifluralin, and linuron. New regulatory restrictions along with loss of crop tolerances and costly environmental monitoring studies may lead to the loss of some good herbicides:08/23; NY/Carrots are in critical need of novel weed control options, particularly with the evolution of linuron resistance in pigweed species:09/23; OH:Need it in carrots for residual weed control activity on Muck soils:08/26; WI: need if the ecs data looks acceptable:08/26; OR:A new moa can help with resistance mgmt of resistant weeds like common groundsel and pigweeds in carrot &nd carrot seed production. The chemigation method would also be of interest to the Columbia Basin region:08/26; Efficacy/Crop Safety (E/CS) Data Required: E/CS Research Comments: no early season phytotoxicity evaluation data collected in 2023 trial; vigor after the second application looks acceptable, but significant crop phytotoxicity was observed from the late application of both rates; original supporting data did not include sequential applications of treatments, though sequential applications are desired. RBB 8/23/sb; PER THE 2024 PERFORMANCE PROTOCOL: TESTING EFFICACY AND CROP SAFETY TO SUPPORT REGISTRATION OF PYROXASULFONE ON CARROT; TRIALS SHOULD BE PLACED ON COARSE TO MEDIUM-TEXTURED SOILS AS WORST CASE FOR CROP RESPONSES; COMPARE 1X (0.081 LB AI/A) AND 2X (0.16 LB AI/A) RATES OF ZIDUA 4.17 SC, AT A NUMBER OF APPLIC PLACEMENT AND TIMING SPECIFICATIONS (SEE PROTOCOL FOR DETAILS), ALL IN AT LEAST 5 GPA; IF AVAILABLE, PROVIDE IRRIGATION TO PROPERLY ACTIVATE TRTS IF ADEQUATE RAINFALL IS NOT EXPECTED AFTER APPLIC; EVALUATE CROP INJURY AND YIELD; 2025 PERF PROTOCOL FOLLOWS DETAILS OF THE 2024 PROTOCOL Comments: Data under XH498 (rec'd 2/2014) is variable and was converted with this new request. Original supporting data did not include sequential applications of treatments, though sequential applications are desired, and a more complete report has been requested. Requester may also desire a chemigation option for preemergence application.08/23/rbb/sb; Category changed per MFG to Potential, MFG Requires E/CS Data Before Residue Study, 09/23 JPB; Performance protocol signed, status changed from "Potential: E/CS before approval for residue study" to "E/CS ongoing" 02/24/drs; Status updated to "Under Evaluation", preliminary E/CS data should be available before the FUW 06/26/ds Field Res.Dir (FRD) Field ID# Field Data Track# Raw Data Data to MFG Performance Results & Comments Sosnoskie, Lynn 24-NYP04 NA The 2024 trial failed and will be repeated in 2025 09/24/ds; 2025 trial lost due to excessively wet spring, and will be repeated in 2026:10/25/ds; 2026 trial failed and will not be repeated; 08/26/ds Zandstra, Dr. Bernard H. 13-MI-DMP RECD 3714.pdf 0.09 AND 0.18 LB AI/A PRE ON HOUGHTON MUCK SOIL; GOOD CROP TOLERANCE Zandstra, Dr. Bernard H. 13-MI-DMP RECD 3715.pdf 0.033 LB AI/A POST; MODERATE INJURY, YIELD LESS THAN PROMETRYN. Bellinder, Dr. Robin 13-NY-DMP RECD 3730.pdf 0.1 LB AI/A PRE ON MUCK SOIL; GOOD CROP TOLERANCE Bellinder, Dr. Robin 13-NY-DMP RECD 3731.pdf 0.08 LB AI/A PRE ON HOWARD GRAVEL LOAM SOIL; SEVERE STUNTING AND HIGH YIELD LOSS Zandstra, Dr. Bernard H. 15-MI-DMP RECD 4098.pdf 0.089, 0.111, 0.159, 0.179, 0.223 AND 0.267 LB AI/A PO1 (3-4 LF) FOLLOWING LINURON PRE ON HOUGHTON MUCK SOIL; GOOD CROP TOLERANCE. Zandstra, Dr. Bernard H. 17-MI-DMP RECD 4503.pdf 0.133 AND 0.267 LB AI/A PRE ON HOUGHTON MUCK SOIL; GOOD CROP TOLERANCE. Sidhu, Jaspreet 24-CAP06 RECD 5839.pdf 10/24 Zidua SC applied at 2.5 or 5.0 fl oz/a (0.081 or 0.16 lb ai/a) preemergence (PRE) and/or postemergence (POST) to ‘Topcut’ carrots seeded into a sandy loam soil. POST applications were made 39 days after planting. All Zidua PRE treatments caused 100% stand loss and POST treatments provided no weed control. Yield data was not collected due to severe stand loss in most of the trial. Sidhu, Jaspreet 25-CAP09 RECD 6048.pdf 02/26 Zidua SC applied at 2.5 or 5.0 fl oz/a (0.081 or 0.16 lb ai/a) postemergence (POST) to ‘Crispy Cut’ carrots 34 days after planting (DAP) into a sandy loam soil. The entire trial received a preemergence (PRE) application of linuron at 0.5 lb ai/a two DAP. In this trial, linuron PRE did not provide any weed control, so impact of pyroxasulfone could not be adequately evaluated. Lack of linuron PRE efficacy may be due to weed spectrum and/or possible linuron leaching from frequent irrigation needed for June-planted crop. Yield data could not be collected.