三种杀菌剂对玉米褐斑病菌的毒力及田间控制作用  

Toxicity and field control efficacy of three fungicides against to Physoderma maydis

作　　者：李俊虎[1] 姜兴印[1] 戈大庆[1] 王燕[1] 段强[1] 王冲[1] 鲍静[1] 

机构地区：[1]山东农业大学植物保护学院,山东泰安271018

出　　处：《农药学学报》2011年第3期253-260,共8页Chinese Journal of Pesticide Science

基　　金：山东省农业重大应用技术创新课题;山东省现代农业产业技术(玉米体系)项目;"十一五"国家科技支撑计划项目(2007BAD31B04)资助

摘　　要：采用孢子萌发法,分别测定了代森锰锌、戊唑醇和霉灵对玉米褐斑病菌Physoder mamaydis的室内毒力;并通过田间小区试验,研究了80%代森锰锌可湿性粉剂(WP)、430 g/L戊唑醇悬浮剂(SC)和70%霉灵可湿性粉剂(WP)对病原菌致病力的影响,以及在8叶期茎叶喷雾处理对该病害的田间控制作用。结果表明:代森锰锌对病原菌休眠孢子囊的萌发具有明显的抑制作用,EC50值为66.71 mg/L,而戊唑醇和霉灵的抑制效果较差;代森锰锌和戊唑醇能有效降低病原菌的致病力,处理小区植株发病叶片均控制在穗位叶以下,且穗位叶叶绿素含量、净光合速率和根系活力均明显高于对照区,防效分别达91.31%和88.99%;代森锰锌和戊唑醇处理小区玉米增产效果明显,增产率分别达13.8%和11.5%。The spore germination method was used to determine the toxicities of tebuconazole,mancozeb and hymexazol to Physoderma maydis,and field trials were conducted to ascertain the effects of mancozeb 800 WP,430 g/L tebuconazole SC and hymexazol 700 WP on pathogenicity,as well as control efficacy when applied at 8-leaf stage of corn by spray.The results showed that mancozeb exhibited great inhibition to the germination of the resting sporangia of P.maydis,with the EC50 value of 66.71 mg/L,while tebuconazole and hymexazol had little effects.The pathogenicity was effectively lowered by the treatments of mancozeb and tebuconazole,which suppressed the occurrence of corn brown spot below the ear leaf and increased the content of chlorophyll,net photosynthetic and root activity.The control efficacy of mancozeb and tebuconazole against P.maydis were 91.31% and 88.99% respectively,which resulted in an increased yields of corn by 13.8% and 11.5%,comparing with that of CK.

关 键 词：杀菌剂 玉米褐斑病菌 毒力 田间控制作用 产量 

分 类 号：S482.2[农业科学—农药学] S481.9[农业科学—植物保护]