7种除草剂对小麦纹枯病菌生长及致病力的影响  

Effects of seven herbicides on growth and pathogenicity of Rhizoctonia cerealis Vander Hoeven

作　　者：陈厚德[1] 倪桂花[1] 王彰明[1] 袁树忠[1] 

机构地区：[1]扬州大学农学院,江苏扬州225009

出　　处：《扬州大学学报（农业与生命科学版）》2005年第3期66-69,78,共5页Journal of Yangzhou University：Agricultural and Life Science Edition

基　　金：江苏省"十五"重大攻关项目(BE2001340)

摘　　要：利用麦田常用的骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁7种除草剂,探讨其对小麦纹枯病菌菌丝生长的抑制作用及致病力的影响。结果表明:骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁的EC50分别为7.03、26.38、67.20、88.05、199.35、1 249.55和203.31 m g.L-1。在50 m g.L-1浓度下,对菌核数的抑制率分别为86.3%、57.8%、74.5%、73.5%、71.6%、55.9%和63.7%;对小麦纹枯病菌侵染力的抑制率分别为44.83%、25.00%、14.66%、-1.00%、31.03%、35.34%和25.86%。显微镜观察表明:经除草剂处理后,菌丝细胞形态均发生不同程度的异常变化,骠马可延迟菌丝侵入叶鞘细胞的时间,并影响菌丝向邻近细胞扩展。The results showed that seven herbicides ： fenoxaprop-P-ethyl, butachlor, fluroxypyr, chlorsulfuron＋isoproturon, tribenuron-methyl, dicamba and metsulfuronm-methyl had inhibition effects on the mycelia growth of Rhizoctonia cerealis with different degrees. Their EC50was 7.03, 26.38, 67.20, 88.05, 199.35, 1 249.55 and 203.31 mg·L^-1 respectively. Their inhibition rates of sclerotia formation were 86.3%, 57.8%, 74.5%, 73. 5%, 71.6%, 55.9% and 63. 7% respectively and the inhibition rates to the pathogenicity of the pathogen were 44. 83%, 25. 00%, 14. 66%, - 1.00 %, 31.03 %, 35.34 % and 25.86 % respectively, at the concentration of 50 mg·L^-1. Microscopic observation indicated that the shape of mycelia treated with herbicides deformed in varying degrees. The herbicide fenoxaprop-P could delay the mycelia invading time and could affect the mycelia further penetrating and expending in vicinal cells.

关 键 词：小麦 纹枯病菌 除草剂 菌丝生长 致病力 

分 类 号：S435.121.48[农业科学—农业昆虫与害虫防治] S512[农业科学—植物保护]