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Prnum Pesticide(MFG) Commodity (Crop Group) Category (Code) EPA Status 13323 B FLAZASULFURON ISK PEACH (12-12B = PEACH SUBGROUP) RESEARCHABLE, ONLY RESIDUE DATA NEEDED (03) Reasons for need: ANNUAL BROADLEAF WEEDS, YELLOW NUTSEDGE, ANNUAL GRASSES; LACK OF ALTERNATIVES Efficacy/Crop Safety (E/CS) Data Required: E/CS Research Comments: IN THE 2023 PERFORMANCE PROTOCOL (ALSO COVERS P13324 [PLUM] AND P13325 [CHERRY]): TESTING 4 RATES OF MISSION (0.0125, 0.023, 0.045, 0.089 LB AI/A IN 15-50 GPA), COMPARED WITH A WEED FREE UNTREATED; TRIALS WILL BE CONDUCTED ON TREES THAT ARE AT LEAST 2 YEARS OLD, AND THE SAME TRMTS WILL BE APPLIED TO THE SAME PLOTS 2 YEARS IN A ROW; FOLLOW THE MISSION LABEL FOR PROTECTION OF TREES, RECOMMENDED ADJUVANTS AND RATES, AND REQUIRED TEST SITE SOIL CHARACTERISTICS; MAKE 2 APPLIC OF EACH TREATMENT, ABOUT 60 DAYS APART, AND ABOUT 75 DAYS BEFORE FIRST EXPECTED COMMERCIAL HARVEST; APPLY IN 2 SWATHS, ONE ON EACH SIDE OF TREE ROW, TO GIVE A BROADCAST SPRAY PATTERN COVERING A SWATH OF AT LEAST 6 FT; EVALUATE WEED CONTROL, CROP INJURY AND CROP YIELD; 2024 PERFORMANCE PROTOCOL COVERS YEAR 2 OF THESE 2-YR TRIALS ON THE SAME PLOTS Comments: REGISTRANT CHANGED USE RATE AND APPLIC TO "AT DORMANCY" AFTER INJURY SEEN IN SOME 2020 TRIALS:08/21; TREES MUST BE 2 YEARS OR OLDER:04/22; ECS PROTOCOL SIGNED 03/23, RESIDUE MOVES FORWARD BASED ON E/CS DATA; WAS E/CS BEFORE RESIDUE FOR CATEGORY PRIOR TO SIGNING E/CS PROTOCOL:03/23 JPB; EPA GREEN:08/23; The performance protocol covers additional PR#s: 13324 Flazasulfuron/Plum & 13325 Flazasulfuron/Cherry 05/24/drs; as of a 04/24 mtg with ISK, they now support this project as needing residue only. Since a perf protocol is in process the status has been updated to Researchable, e/cs on-going; residue data needed:05/24/sb; EPA CAUTION:08/24; E/CS completed & status updated to "Researchable Only Residue Data Needed" 01/25/ds Field Res.Dir (FRD) Field ID# Field Data Track# Raw Data Data to MFG Performance Results & Comments Chaudhari, Dr. Sushila 23-MIP11 RECD 5639.pdf 10/23 Mission 25WG applied twice, 39 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘Montmorency’ cherries growing in a Dryden sandy loam. No crop injury observed from any flazasulfuron treatment. Good to excellent total broadleaf control observed from three highest rates was 83 to 92% at 28 days after second application (DAT-2). This control declined to 35 to 78% by 68 DAT-2. Grass control 28 DAT-2 ranged from 89 to 98% from all rates and maintained 80 to 100% control at 68 DAT-2. Flazasulfuron did not impact cherry yield, regardless of rate. Smith, Stephen C 23-NCP08 RECD 5649.pdf 11/23 Year 1 of 2 with treatments applied to the same plots both years. Trial conducted in peach. Mission 25WG applied twice, 58 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘O’Henry’ peaches growing in a sand (89% sand). No crop injury observed from any flazasulfuron treatment. Light weed pressure prevented collection s weed control data. Yield not collected due to late freeze and late season disease pressure. Hanson, Brad 23-CAP26 RECD 5687.pdf 01/24 Trial conducted in plums. Mission 25WG applied twice, 59 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘French prune’ plums growing in a Yolo loam. No crop injury observed from any flazasulfuron treatment. Maintenance herbicide program provided excellent weed control, so no weed data collected. Flazasulfuron did not impact plum yield, regardless of rate. Hanson, Brad 23-CAP27 RECD 5688.pdf 01/24 Trial conducted in plums. Mission 25WG applied twice, 63 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘French Improved’ prunes. No crop injury observed from any flazasulfuron treatment, including fruit injury inspection at harvest. Good to excellent bindweed control (≥80%) from all treatments 15 and 30 days after second application. Bindweed was controlled 96% or greater by the two higher rates at all evaluations. Mitchem, Wayne 23-NCP07 RECD 5698.pdf 03/24 Trial conducted near Johnston, South Carolina. Year 1 of 2 with treatments applied to the same plots both years. Trial conducted in peach. Mission 25WG applied twice, 75 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘Rich Pride’ peaches growing in a sandy loam. No crop injury observed from any flazasulfuron treatment. Near complete control of weeds from all flazasulfuron treatments. Late freeze in Spring 2023 prevented yield data collection. Liu, Rui 23-WAP05 RECD 5712.pdf 03/24 Year 1 of 2 with treatments applied to the same plots both years. Trial conducted in sweet cherries growing in a silt loam at the Prosser research station. Mission 25WG applied once at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks. Little to no crop injury observed from flazasulfuron treatments. Excellent barnyardgrass control from all rates through 40 days after application. No yield data collected. Hanson, Brad 24-CAP01 RECD 5821.pdf 09/24 Year 2 of 2 with treatments applied to the same plots each year. Trial conducted in plums. Mission 25WG applied twice, 58 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘French prune’ plums growing in a Yolo loam. No crop injury observed from any flazasulfuron treatment. Maintenance herbicide program provided excellent weed control, so no weed data collected. Flazasulfuron did not impact plum yield, regardless of rate. Hanson, Brad 24-CAP23 RECD 5822.pdf 09/24 Year 2 of 2 with treatments applied to the same plots each year. Trial conducted in plums. Mission 25WG applied twice, 58 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘French Improved’ prunes. No crop injury observed from any flazasulfuron treatment, including fruit injury inspection at harvest. Good to excellent bindweed control (≥80%) from all treatments 15 and 30 days after second application. Bindweed was controlled 89% or greater by the two higher rates at all evaluations. Soldan, Nicole 24-MIP01 RECD 5847.pdf 11/24 Year 2 of 2, with treatments applied to the same plots both years. Mission 25WG applied twice, 32 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘Montmorency’ cherries growing in a Dryden sandy loam. No crop injury observed from any flazasulfuron treatment. Flazasulfuron provided fair to good control of most broadleaf weeds 22 days after second application (DAT-2), ranging from 68 to 87%. Control of curly dock at this time was slightly better, ranging from 82 to 97%. Weed control was generally the same from all rates through 51 DAT-2, but a decline in horseweed and hawkweed control was evident. Flazasulfuron did not impact cherry yield, regardless of rate. Mitchem, Wayne 24-NCP02 RECD 5871.pdf 12/24 Trial conducted near Johnston, South Carolina. Year 2 of 2 with treatments applied to the same plots both years. Trial conducted in peach. Mission 25WG applied twice, 60 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘Rich Pride’ peaches growing in a sandy loam. No vigor reductions from 2023 flazasulfuron applications observed in spring 2024. No crop injury observed from any flazasulfuron treatment in Year 2. Excellent weed control from all treatments through 40 days after first spray. No weed control data was collected after second 2024 application. Grower thought data collection was complete and applied maintenance herbicides to entire trial. Smith, Stephen C 24-NCP03 RECD 5878.pdf 01/25 Year 2 of 2 with treatments applied to the same plots both years. Trial conducted in peach. Mission 25WG applied twice, 51 days apart, at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks of ‘O’Henry’ peaches growing in a sand. No crop injury observed from any flazasulfuron treatment. Light weed pressure prevented collection of weed control data. Severe wind storm approximately one week prior to anticipated harvest required yield data to be estimated through fruit counts and average fruit weights. No yield differences seen between treatments, using this data. Performance Summary 25-HQ-SUM RECD 5879.pdf 01/25 SUMMARY OF IR-4 PRODUCT PERFORMANCE PREPARED BY RBB. INCLUDES DATA FROM FT ID#s 23-NCP07, 23-NCP08, 23-CAP26, 23-CAP27, 23-MIP11, 23-WAP05, 24-MIP01, 24-NCP02, 24-NCP03, 24-CAP01, 24-WAP01, AND 24-CAP23. FORWARDED TO ISK:01/25 Liu, Rui 24-WAP01 RECD 5880.pdf 01/25 Year 2 of 2 with treatments applied to the same plots both years. Trial conducted in sweet cherries growing in a silt loam at the Prosser research station. Mission 25WG applied once at 0.8, 1.5, 2.85 or 5.7 oz/a (0.0125, 0.023, 0.045 or 0.089 lb ai/a) along both sides of the row and across the lower trunks. No crop injury observed from flazasulfuron treatments. Fair to good weed control from all rates through 65 days after treatment. Control tended to be higher with highest two rates, with some significant differences. No yield data collected.