2009年我国部分麦区小麦白粉菌群体对三唑酮和嘧菌酯的敏感性测定  

Sensitivity of Blumeria graminis f.sp. tritici isolates to triadimefon and azoxystro-bin in 2009 in China

作　　者：王丽[1,2] 陈鹏[1] 周益林[2] 段霞瑜[2] 曹学仁[2] 

机构地区：[1]西北农林科技大学生命科学学院,杨凌712100 [2]中国农业科学院植物保护研究所植物病虫害生物学国家重点实验室,北京100193

出　　处：《植物病理学报》2011年第6期654-658,共5页Acta Phytopathologica Sinica

基　　金：公益性行业科研专项(3-15);国家重点基础研究发展计划(2010CB951503)

摘　　要：自1976年以来,三唑酮一直就是我国防治小麦白粉病的主要药剂。1991年首次在山东省发现抗性菌株,之后其他地区也相继有抗药性菌株的报道。本实验室从1995年就开始监测小麦白粉菌对三唑酮的抗药性,研究结果表明,平均抗性水平和抗性菌株的频率均总体呈上升趋势[1～3]。鉴于目前小麦白粉菌对三唑酮的抗性水平较高,急需作用机理不同的杀菌剂的推广和使用。甲氧基丙烯酸酯类杀菌剂是一类低毒、高效、广谱。The isolates of Blumeria graminis f.sp.tritici were sampled and isolated from 7 provinces/cities,and the sensitivity of 110 isolates to triadimefon and 130 isolates to azoxystrobin were tested using seed treatment and detached leaf segment methods,respectively.The results showed that the mean EC50 of the isolates to triadimefon was 118.24 mg·L-1,and the mean resistance factor（Rf） was 56.58.The frequency of resistant isolates to triadimefon reached 99.09%.The high resistant isolates（Rf〉40） accounted for 49.09%,and the moderate resistant isolates（10〈Rf≤40） accounted for 47.27%,while only one sensitive isolate accounted for 0.91% was detected in Hubei Province.The base-line of B.graminis f.sp.tritici to azoxystrobin was 41.03 mg·L-1.No significant cross-resistance was observed between triadimefon and azoxystrobin for B.graminis f.sp.tritici.These results will provide some references for the chemical control of wheat powdery mildew disease as well as the appropriate use of the fungicides.

关 键 词：小麦 三唑酮 嘧菌酯 敏感性测定 白粉病 

分 类 号：S432[农业科学—植物病理学]