Control of acetolactate synthase–resistant Palmer amaranth in dry edible bean

Abstract Herbicide-resistant Palmer amaranth is a troublesome weed in several agronomic crops and relatively new challenge to dry bean production western Nebraska. Objectives were evaluate preemergence (PRE) postemergence (POST) herbicides for control of acetolactate synthase–resistant their effect on density biomass as well injury yield Field experiments conducted 2017 2019 near Scottsbluff, NE. The arranged two-factor strip-plot design. factor consisted no-PRE or pendimethalin (1,070 g ai ha –1 ) + dimethenamid-P (790 h applied PRE. main-plot was POST herbicides, which various mixtures imazamox, bentazon, fomesafen single sequential application at labeled rates, reduced rates imazamox (9 bentazon (314 (70 (two three) applications. PRE during both years increased 2017. treatments containing improved compared with only. sequential-application reduced-rate system did not improve one rate either year. Using followed by provided 86% 99% 2019, respectively.