%0 Journal Article
%T Weed Control in Dicamba-Resistant Soybean with Glyphosate/Dicamba Applied at Various Doses and Timings
%A Shropshire
%A Christy
%A Sikkema
%A Peter H.
%A Soltani
%A Nader
%J -
%D 2020
%R https://doi.org/10.1155/2020/8903941
%X Seven field trials were completed over a three-year period (2016 to 2018) in southwestern Ontario, Canada, to assess weed control in conventional-till dicamba-resistant (DR) soybean with glyphosate/dicamba (2ˋ:ˋ1 ratio) applied postemergence (POST) at 3 doses (900, 1350, and 1800ˋg﹞ae﹞haˋ1) and 3 application timings (up to 5, 15, and 25ˋcm weeds). There was minimal soybean injury (≒2%) from treatments evaluated. Glyphosate/dicamba applied at application timing of up to 5, 15, and 25ˋcm weeds, controlled Amaranthus spp. (pigweed spp.) 87每96, 94每99, and 99%; Ambrosia artemisiifolia (common ragweed) 93每99, 97每99, and 99每100%; Chenopodium album (lambsquarters) 89每99, 95每100, and 99每100%; Echinochloa crus-galli (barnyardgrass) 81每84, 94每96, and 96每97%; Setaria faberi (giant foxtail) 37每90, 77每98, and 99每100%; and Setaria viridis (green foxtail) 94每96, 99, and 99每100%, respectively. Additionally, glyphosate/dicamba applied POST at 900, 1350, and 1800ˋg﹞ae﹞haˋ1 controlled Amaranthus spp. 90每97, 95每98, and 97每99%; A. artemisiifolia 95每98, 97每99, and 99每100%; C. album 92每99, 95每100, and 98每100%; E. crus-galli 84每88, 93-94, and 95-96%; S. faberi 74每95, 75每97, and 79每98%; and S. viridis 98, 98每99, and 98每100%, respectively. Weed interference reduced DR soybean yield as much as 51% compared to the highest yielding treatments. Results indicate that glyphosate/dicamba applied POST at the label doses can provide an adequate control of troublesome weeds in DR soybean. Weed control was generally most consistent when glyphosate/dicamba was applied at the highest registered dose in Ontario (1800ˋg﹞ae﹞haˋ1) and when weeds were up to 25ˋcm tall
%U https://www.hindawi.com/journals/ija/2020/8903941/