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首页> 外文期刊>Weed Technology: A journal of the Weed Science Society of America >POST Herbicide Combinations for Velvetleaf (Abutilon theophrasti) Control in Sugarbeet
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POST Herbicide Combinations for Velvetleaf (Abutilon theophrasti) Control in Sugarbeet

机译：POST除草剂组合用于甜菜中的Velvetleaf（Abutilon theophrasti）控制

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摘要

Velvet leaf is one of the most significant and fastest spreading alien weeds in Europe, and it is a difficult weed to control in conventional sugarbeet. Laboratory experiments were carried out in 2007 and 2008 and field experiments were carried out in 2006, 2007, and 2008 with the aim of finding effective herbicide combinations and optimum timing of control. Herbicides containing the active ingredients phenmedipham, desmedipham, ethofumesate, clopyralid, and triflusulfuron were all tested at different timings. Phenmedipham + desmedipham + ethofumesate gave 87% velvetleaf control in pot experiments when applied at the growth stages of velvetleaf cotyledons and one true leaf, but only 27 to 42% control in field trials. Triflusulfuron gave 76% control in pot experiments and 83 to 88% control in field experiments. The timing of the first and second herbicide applications was very important: the first application of herbicides must be at the cotyledon stage of velvetleaf. A 1-wk delay in first application reduced herbicide efficacy by 8%. A 5-d period between the first and second treatments gave 93% control, while a 10-d period between the first and second treatments gave only 77% control. Sugarbeet yield decreased by 60 to 86% due to competition with velvetleaf when a standard herbicide combination (phenmedipham + desmedipham + ethofumesate) was used, and the velvetleaf produced between 6,700 and 14,800 seeds m(-2). Inclusion of triflusulfuron in the herbicide treatment significantly reduced velvetleaf seed production to between 200 and 4,700 seeds m(-2). In most cases, inclusion of triflusulfuron increased sugarbeet yield. Better velvetleaf control occurred in years when the sugarbeet canopy developed early and the index of leaf area of sugarbeet was higher.
机译：天鹅绒叶子是欧洲最重要，传播最快的外来杂草之一，在传统甜菜中很难控制。为了找到有效的除草剂组合和最佳的控制时机，在2007年和2008年进行了实验室实验，并在2006年，2007年和2008年进行了野外实验。含有有效成分苯medipham，desmedipham，ethofumesate，clopyralid和triflusulfuron的除草剂均在不同的时间进行了测试。在盆栽实验中，当将苯乙哌啶+去甲乙草胺+草铵膦施用于绒毛子叶和一片真叶的生长阶段时，可控制绒毛的控制率为87％，但在田间试验中仅提供27％至42％的控制。三氟磺隆在盆栽实验中控制了76％，在野外实验中控制了83至88％。第一次和第二次除草剂的施药时间非常重要：第一次除草剂必须在绒毛的子叶阶段。首次施用延迟1周，除草剂功效降低了8％。第一次和第二次治疗之间的5天间隔控制了93％，而第一次和第二次治疗之间的10天间隔控制了77％。当使用标准除草剂组合（phenmedipham + desmedipham + ethofumesate）使用同绒毛竞争时，甜菜产量降低了60％到86％，而该绒毛产生了6,700至14,800种子m（-2）。在除草剂处理中加入三氟磺隆可将绒毛种子的产量显着降低至200至4,700种子m（-2）。在大多数情况下，加入三氟磺隆可以提高甜菜的产量。甜菜冠层发育较早且甜菜叶面积指数较高的年份中，较好的绒毛控制。

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