Control of acetolactate synthase inhibitor/glyphosate-resistant Palmer amaranth (<i>Amaranthus palmeri</i>) in isoxaflutole/glufosinate/glyphosate-resistant soybean

Abstract Palmer amaranth is the most problematic and troublesome weed in agronomic cropping systems United States. Acetolactate synthase (ALS) inhibitor glyphosate-resistant (GR) has been confirmed Nebraska it widespread several counties. Soybean resistant to isoxaflutole/glufosinate/glyphosate developed that provides additional herbicide site of action for control herbicide-resistant weeds. The objectives this study were evaluate programs ALS inhibitor/GR their effect on density biomass, as well soybean injury yield isoxaflutole/glufosinate/glyphosate–resistant soybean. Field experiments conducted a grower’s field infested with GR near Carleton, Nebraska, 2018 2019. Isoxaflutole applied alone or mixed sulfentrazone/pyroxasulfone, flumioxazin/pyroxasulfone, imazethapyr/saflufenacil/pyroxasulfone provided similar (86%–99%) 21 d after PRE (DAPRE). At 14 early-POST (DAEPOST), isoxaflutole followed by (fb) POST controlled 10% 63% compared 75% 96% glufosinate EPOST both years. A fb 80% 99% late-POST (DALPOST) 2018, reduced 89% 100% 58% 2019 at DAEPOST. No was observed from any tested study. relatively higher due precipitation generally no differences between programs. This research indicates are available effective isoxaflutole/glufosinate/glyphosate-resistant