Glyphosate-resistant (GR) canola is a widely grown crop across western Canada and has quickly become a prolific volunteer weed. Glyphosate-resistant soybean is rapidly gaining acreage in western Canada. Thus, there is a need to evaluate herbicide options to manage volunteer GR canola in GR soybean crops. We conducted an experiment to evaluate the efficacy of various PRE and POST herbicides applied sequentially to volunteer GR canola and to evaluate soybean injury caused by these herbicides. Trials were conducted across Saskatchewan and Manitoba in 2014 and 2015. All treatments provided a range of suppression (>70%) to control (>80%) of volunteer canola. All treatments with the exception of the glyphosate-treated control reduced aboveground canola biomass by an average of 96%. As well, canola seed contamination was reduced from 36% to less than 5% when a PRE and POST herbicide were both used. Moreover, all combinations of herbicides used had excellent crop safety (<10%). All PRE and POST herbicide combinations provided better control of volunteer canola compared with the glyphosate-only control, but tribenuron followed by bentazon and tribenuron followed by imazamox plus bentazon provided solutions that were low cost, currently available (registered in western Canada), and had the potential to minimize development of herbicide resistance in other weeds.

中文翻译：

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用于控制抗草甘膦大豆中抗草甘膦油菜（Brassica napus）的除草剂计划

抗草甘膦 (GR) 油菜是加拿大西部广泛种植的作物，并迅速成为一种多产的志愿杂草。加拿大西部的抗草甘膦大豆种植面积正在迅速增加。因此，有必要评估除草剂选择以管理 GR 大豆作物中的自愿 GR 油菜。我们进行了一项实验，以评估各种 PRE 和 POST 除草剂依次施用于志愿 GR 油菜的功效，并评估这些除草剂对大豆造成的伤害。2014 年和 2015 年在萨斯喀彻温省和马尼托巴省进行了试验。所有治疗都提供了一系列抑制 (>70%) 到控制 (>80%) 的志愿油菜。除草甘膦处理的对照外，所有处理均将地上油菜生物量平均减少了 96%。同样，当同时使用 PRE 和 POST 除草剂时，油菜种子污染从 36% 降低到不到 5%。此外，所用除草剂的所有组合都具有出色的作物安全性（<10%）。与仅使用草甘膦的对照相比，所有 PRE 和 POST 除草剂组合都能更好地控制志愿油菜，但苯磺隆、苯达松和苯磺隆、咪草啶酸和苯达松提供了低成本、目前可用的解决方案（在加拿大西部注册），并且具有减少其他杂草产生除草剂抗性的潜力。