Efficacy of florpyrauxifen-benzyl and other herbicides in the control of Commelina benghalensis

Commelina benghalensis has become one of the main weeds in the second-crop soybean‒corn system, and the use of auxinic herbicides is essential for its control. The objective of this study was to evaluate the control efficacy of treatments applied in off-season management before soybean cultivation using the herbicides florpyrauxifen-benzyl and other synthetic auxins in the control of C. benghalensis. Experiment 1 consisted of the application of florpyrauxifen-benzyl + glyphosate, triclopyr + glyphosate, [halauxifen + diclosulam] + glyphosate, [halauxifen + diclosulam] + glufosinate, [halauxifen + diclosulam] + glyphosate + saflufenacil, and [halauxifen + diclosulam] + glyphosate + carfentrazone; Experiment 2 consisted of the application of florpyrauxifen-benzyl + glyphosate, triclopyr + glyphosate, halauxifen + glyphosate, [halauxifen + diclosulam] + glyphosate, [halauxifen + diclosulam] + glyphosate + glufosinate, and [halauxifen + diclosulam] + glyphosate + carfentrazone. At 60 days after application, florpyrauxifen-benzyl + glyphosate reached 73.8% efficacy in the control of C. benghalensis in Experiment 1 and 92% in Experiment 2, whereas the other treatments presented a maximum control of 55.5%. The application of florpyrauxifen-benzyl + glyphosate effectively controlled C. benghalensis when applied during off-season management before soybean sowing. Florpyrauxifen-benzyl was superior in efficacy to treatments involving the application of other synthetic auxins.