Fenclorim rice safening and weed control with fall‐applied acetochlor and pyroxasulfone

Applications of very long-chained fatty acid elongase (VLCFA)-inhibiting herbicides are currently not labeled within U.S. rice (Oryza sativa L.) production but have been used in Asian to suppress weedy and control other annual grasses small-seeded broadleaves. Therefore, separate experiments were initiated the fall 2019 2020 evaluate tolerance (O. with acetochlor pyroxasulfone following spring. A three-factor experiment a randomized complete block design was implemented factors being (1) herbicide choice (acetochlor or pyroxasulfone), (2) low high rate (2100 4200 g ai ha−1, at 237 475 ha−1 pyroxasulfone, respectively), (3) without fenclorim seed treatment (2.5 kg−1 seed). Throughout experiments, exhibited <10% injury acetochlor. The reduced (averaged over rate) from 28% 21% 28 days after emergence for both trial types. Fenclorim also improved rough-rice yield by 12 18 percentage points two different studies. However, regardless fenclorim, did demonstrate <20% pyroxasulfone. any interaction containing influence control, ranged 0% 48%. Findings this effects fall-applied efficacy controlling rice.