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Prnum Pesticide(MFG) Commodity (Crop Group) Category (Code) EPA Status 13957 BROMOXYNIL NUFARM ONION (SEED CROP) (03-07AB = ONION BULB AND GREEN SUBGROUPS) UNDER EVALUATION (06) Reasons for need: postemergence herbicide options. Lack of current available options for green onion seed production. Product registered in dry bulb onion crops in other regions but not for western Oregon. Current label states "Do not use this product on onions grown under low light intensity, in areas such as Oregon, west of the Cascades.":05/25; Efficacy/Crop Safety (E/CS) Data Required: E/CS Research Comments: Comments: Key Export Market likely in EU. Phytotoxicity not expected: supporting data, which included 0.21 to 1.3 pt/a, caused little to no crop injury 05/25/ds. The commodity listed is onion (seed crop), but the request is specifically for green onion seed production 05/25/ds; EPA CAUTION:08/25; Field Res.Dir (FRD) Field ID# Field Data Track# Raw Data Data to MFG Performance Results & Comments Becerra-Alvarez, Aaron 22-OR-DMP RECD 5952.pdf 08/25 Maestro 4EC applied at 3.45, 6.9, 13.8, or 20.7 fl oz/a (0.108, 0.216, 0.431, or 0.647 lb ai/a) over three green onion varieties at the 2 or 4 leaf stage. Crops were growing in a silty clay loam. Little to no crop injury observed through 40 days after application, regardless of rate or timing. Onion biomass was not impacted by bromoxynil treatments. Control of weeds in the trial from bromoxynil was reported as poor. Becerra-Alvarez, Aaron 24-OR-DMP RECD 5952.pdf 08/25 Maestro 4EC applied at 3.99, 11.97, or 24.0 fl oz/a (0.1258, 0.375, or 0.75 lb ai/a) over 2 or 4 leaf stage. Researcher commented that weed control from early timings was better than later timings, but was not great from any treatment in the trial. Crop injury from bromoxynil was not different from the weed-free check. Crop biomass was variable within herbicide treatments and were not different from each other, though all were significantly lower than the weed-free.