Five experiments were conducted in Ontario, Canada from 2016 to 2018 to\ndetermine how doses of S-metolachlor and halosulfuron applied preemergence\n(PRE) should be adjusted to control specific weed species in white\nbean. S-metolachlor, halosulfuron, and S-metolachlor + halosulfuron caused\nminimal (1% to 4%) injury in white bean. Weed interference reduced white\nbean yield 54%. On average, weed interference with S-metolachlor and halosulfuron\ndecreased yield 34% and 29%, respectively. In contrast, white bean\nseed yield was similar to the weed-free control with the S-metolachlor + halosulfuron\ntankmixes. S-metolachlor applied alone controlled A. theophrasti ,\nA. retroflexus , A. artemisiifolia , C. album, E. crus-galli and S. viridis 0% to\n3%, 78% to 93%, 0% to 9%, 5% to 15%, 97% to 99% and 96% to 98%, respectively.\nHalosulfuron applied alone controlled A. theophrasti , A. retroflexus , A.\nartemisiifolia , C. album, E. crus-galli and S. viridis 39% to 87%, 93% to 99%,\n64% to 88%, 34% to 59%, 10% to 30% and 13% to 35%, respectively. S-metolachlor\n+ halosulfuron tankmixes controlled A. theophrasti , A. retroflexus , A.\nartemisiifolia , C. album, E. crus-galli and S. viridis 47% to 94%, 98% to 100%,\n78% to 94%, 37% to 78%, 94% to 98% and 91% to 96%, respectively. Weed\ndensity and biomass reductions with the herbicides evaluated followed the\nsame pattern as visible weed control assessments. Results from this study indicate\nthat doses of S-metolachlor and halosulfuron, when applied as a tankmix,\nshould be adjusted based on a weed species composition in each individual\nwhite bean field.
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