Interaction of dicamba, fluthiacet-methyl, and glyphosate for control of velvetleaf (<i>Abutilon theophrasti</i>) in dicamba/glyphosate–resistant soybean

Abstract Velvetleaf is an economically important weed in agronomic crops Nebraska and the United States. Dicamba applied alone usually does not provide complete velvetleaf control, particularly when taller than 15 cm. The objectives of this experiment were to evaluate interaction dicamba, fluthiacet-methyl, glyphosate or a mixture two- three-way combinations for control dicamba/glyphosate–resistant (DGR) soybean whether height (?12 cm ?20 cm) at time herbicide application influences efficacy, density, biomass, yield. Field experiments conducted near Clay Center, NE 2019 2020. was arranged split-plot with as main plot treatment herbicides subplot treatment. Fluthiacet provided ?94% 28 d after (DAT) ?96% biomass reduction regardless rate height. 31% 74% DAT dicamba tall compared 47% 100% ?12-cm-tall plants. ?20-cm-tall &lt;75% &lt;87% ?90% 560 g ae ha ?1 + fluthiacet 7.2 ai 1,260 . 280 630 resulted 86% expected 99% control. additive