3种混配除草剂对多年生杂草苣荬菜的防除效果

Control Effect of Three Mixed Herbicides on Sonchus arvensis

[目的]明确不同混配除草剂对多年生杂草苣荬菜的防除效果。[方法]田间设置不同施药剂量的3种混配除草剂,测定除草效果。[结果]75%二氯吡啶酸SG+20%氯氟吡氧乙酸异辛酯EC以140 g/hm^2+500 mL/hm^2、160 g/hm^2+400 mL/hm^2施药对苣荬菜的株防效分别达86.59%、84.80%,对苣荬菜的鲜重防效达95.03%、97.05%;75%二氯吡啶酸SG+10%苄嘧磺隆WP以不同剂量混配施药对苣荬菜的鲜重防效均达90%以上,其中以160 g/hm^2+200 g/hm^2混配处理对苣荬菜的鲜重防效达96.30%;10%双草醚SC+10%苄嘧磺隆WP以260 mL/hm^2+250 g/hm^2施药对苣荬菜的鲜重防效达93.03%。3种混配除草剂以不同剂量混配施药对苣荬菜的株防效和鲜重防效存在差异。[结论]筛选出的混配除草剂以最佳剂量施药对苣荬菜防除效果良好,为多年生杂草苣荬菜的化学防除提供理论依据。

[Objective]To determine the control effect of three mixed herbicides against Sonchus arvensis.[Method]The different treatments were set in field experiment to study the control effect of three mixed herbicides on Sonchus arvensis.[Result]The plant control effect of clopyralid 75%SG+fluroxypyr-mepthyl 20%EC at 140 g/hm^2+500 mL/hm^2 and 160 g/hm^2+400 mL/hm^2 were reached 86.59%and 84.80%respectively,the fresh weight control effect reached 95.03%and 97.05%.The fresh weight control effect at 96.30%was obtained with clopyralid 75%SG+bensulfuron methyl 10%WP with dose of 160 g/hm^2+200 g/hm^2.The fresh weight control effect of clopyralid 75%SG+bensulfuron methyl 10%WP were more than 90%at different doses.The fresh weight control effect of bispyribac-sodium 10%SC+bensulfuron methyl 10%WP was 93.03%with dose of 260 mL/hm^2+250 g/hm^2.There were differences in plant and fresh weight control effect of three mixed herbicides with different doses on Sonchus arvensis.[Conclusion]The selected mixed herbicides had good control effect on Sonchus arvensis,Which provided a theoretical basis for chemical control of Sonchus arvensis.