胡尊纪 刘军 吴希宝 庄治国 宋化稳 唐广新 刘定蓉 庄占兴

摘要：为明确环磺酮、特丁津联合作用除草效果和35%环磺酮·特丁津OD对玉米田一年生杂草的防除效果以及对玉米的安全性，采用茎叶喷雾法测定2种除草剂室内联合作用试验，并对筛选的35%环磺酮·特丁津OD进行田间药效试验 。结果显示，环磺酮、特丁津以1 ∶ 6质量比复配对玉米田一年生杂草的联合作用效果较好，35%环磺酮·特丁津OD的推荐使用剂量为420～630 g a.i./hm2，施药36 d后对杂草的总鲜重防效可达到93.90 %～97.56%。环磺酮、特丁津复配互补性强，对马齿苋等杂草增效作用明显，35%环磺酮·特丁津OD能够有效防除玉米田一年生杂草，并对玉米安全。

关键词：环磺酮;特丁津;联合作用;杂草;防效;安全性

中图分类号：S451  文献标志码：A  文章编号：1003-935X（2021）01-0050-06

Abstract：The efficacy on annual weeds and crop selectivity of the combination of tembotrione and terbuthylazine was compared to that of the formulated mixture （tembotrione·terbuthylazine 35% OD）. Foliar spraying was used in the laboratory to assess the efficacy of the mixture and the formuation was tested in the field. The mixture of tembotrione and terbuthylazine at a mass ratio of 1 ∶ 6 controlled annual weeds better in corn. The recommended dose of tembotrione·terbuthylazine 35% OD was 420～630 g a.i. /hm2. Efficacy based on fresh weight reduction reached to 94%～98% after 36 days. Tembotrione and terbuthylazine are highly complementary in mixture，with an evident synergistic effect on Portulaca oleracea. Tembotrione·terbuthylazine 35% OD effectively controlled annual weeds and was selective to corn in the field.

Key words：tembotrione;terbuthylazine;compounding;weed;control effect;selectivity

环磺酮（tembotrione）是拜耳公司开发的苯甲酰环己二酮类除草剂，为对羟基苯基丙酮酸双氧化酶（HPPD）抑制剂，主要用于玉米田防除多种阔叶杂草和禾本科杂草，对部分抗性杂草有效。与同类产品硝磺草酮相比，环磺酮活性更高，更耐雨水冲刷，且防治适期更长[1]。环磺酮可阻断植株体内异戊二烯醌的生物合成，引起植株失绿、褪色、组织坏死，最终在2周内死亡。环磺酮除草谱广，对蓟、田旋花、婆婆纳、反枝苋（Amaranthus retrofexus）、辣子草和猪殃殃等有优异的防效，且对后茬作物无药害。环磺酮的活性要高于同类品种硝磺草酮，相较于其他品种，对多种杂草有很强的杀灭作用，无残留活性。虽然环磺酮对玉米田的禾本科杂草和部分阔叶杂草防治效果较好，但防除不彻底，须要寻求相应的复配药剂[2-5]。……