3种农药对蔗田杂草香附子的防除效果及其安全性评价

The Control Effect on Cyperus rotundus L.in Sugarcane Field and Safety Evaluation:Three Kinds of Herbicides

研究旨在明确75%氯吡嘧磺隆WDG、25%硝磺·莠去津OD和73%甲·灭·敌草隆WP等对蔗田香附子的防除效果及其安全性。采用田间试验方法,分别调查了喷施不同药剂处理的甘蔗和香附子的叶色变化情况,香附子地表植株、根和地下球茎(或芽)的死亡率。结果表明,75%氯吡嘧磺隆WDG对香附子地上部分、根和地下球茎(或芽)防效均达90%以上且对甘蔗安全;73%甲·灭·敌草隆WP可有效控制香附子地表植株和根,但对地下球茎(或芽)防效较低;25%硝磺·莠去津OD仅能使香附子地表植株变色,对香附子根和地下球茎(或芽)几乎无效。75%氯吡嘧磺隆WDG对香附子防治效果好且对甘蔗安全,可作为蔗田香附子防治的轮换药剂,使用剂量以90、135 g/hm^2为宜。

The aim is to determine the control effect and safety of 75%Halosulfuron-methyl WDG,25%mesotrione·atrazine OD and 73%MCPA-sodium·ametryn·diuron WP against Cyperus rotundus L.in sugarcane field.Through the field experiment,the cotyledon color changes of sugarcane and C.rotundus L.with different herbicides were investigated,and the mortality rate of surface plants,roots and underground corms(or buds)of C.rotundus L.were also studied,respectively.The results showed that 75%Halosulfuronmethyl WDG had more than 90%control effect against surface plants,roots and underground corms(or buds)of C.rotundus L.and it was safe to sugarcane.73%MCPA-sodium·ametryn·diuron WP could effectively control the surface plants and roots of C.rotundus L.,but its control effect on underground corms(or buds)was low.25%Mesotrione·atrazine OD could only discolor the surface plants of C.rotundus L.,and was almost ineffective to the roots and underground corms(or buds)of C.rotundus L..Therefore,75%Halosulfuronmethyl WDG,which has good control effect against C.rotundus L.and is safe to sugarcane,can be used as a rotation herbicide for C.rotundus L.control in sugarcane field,and the appropriate dosage is 90,135 g/hm^2.