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Prnum Pesticide(MFG) Commodity (Crop Group) Category (Code) EPA Status 13642 + PYRAFLUFEN-ETHYL NAI ONION (DRY BULB) (03-07A = ONION, BULB SUBGROUP) POTENTIAL: E/CS DATA BEFORE APPROVAL FOR RESIDUE STUDY (02) Reasons for need: Annual weeds; probably loss of Dacthal and dire need for alternative herbicides for onion:06/23; NY/Dry bulb onions lack significant chemical tools for the management of emerged weeds (which are especially competitive in young onions). The addition of an active ingredient could enhance the diversity and flexibility of control programs:08/23 Efficacy/Crop Safety (E/CS) Data Required: MFG is concerned with efficacy and phytotoxicity and requires at least 6 E/CS trials in the following states CA(1), PNW (2), S. TX (1), GA(1), NY (1):09/23 E/CS Research Comments: Comments: No tolerance established, but use is labeled in many crop groups, including 03-07A, based on ChemSAC decision that allows preplant use of pyraflufen to be considered as 'non-food' use: 6/23; EPA GREEN: 08/23; Mfg Supports as Potential, E/CS Data before Approval for Residue:09/23 Field Res.Dir (FRD) Field ID# Field Data Track# Raw Data Data to MFG Performance Results & Comments Fennimore, S. 23-CA-DMP RECD 5642.pdf 10/23 ET HERBICIDE/DEFOLIANT APPLED BROADCAST FOLIAR AT 1, 2 OR 4 FL/A (0.0016, 0.0033 OR 0.0065 LB AI/A) OVER 2-LF ‘GREAT WESTERN’ DRY BULB ONIONS GROWING IN A SANDY LOAM SOIL. AT 2, 7 AND 14 DAYS AFTER APPLICATION (DAA), CROP INJURY FROM ALL RATES RANGED FROM 26 TO 39. AT 22 DAA, INJURY FROM TWO LOWER RATES HAD DISSIPATED TO 10 AND 13%. WHEN COMPARED TO THE NON-TREATED, ET DID NOT REDUCE HENBIT OR TOTAL WEED DENSITIES. NO DIFFERENCES IN YIELD OR GRADES WEERE SEEN BETWEEN TREATMENTS.