几种杀菌剂对苜蓿锈病的防效及经济阈值研究  

Research of Control Effect of Several Fungicides and Economic Threshold to Alfalfa Rust

作　　者：雒富春 袁庆华[1] 王瑜[1] 

机构地区：[1]中国农业科学院北京畜牧兽医研究所,北京100193 [2]甘肃农业大学草业学院,甘肃兰州730070

出　　处：《中国草地学报》2014年第4期99-104,共6页Chinese Journal of Grassland

基　　金：农业行业专项(201303057);国家"十二五"支撑项目(2011BAD17B01)

摘　　要：选用8种杀菌剂进行苜蓿锈病田间药效试验以筛选有效防治药剂配方,并通过统计病情指数、株高、茎叶比和产量建立相关模拟方程,计算苜蓿锈病允许损失率和防治经济阈值。结果表明:嘧菌酯和代森锰锌以有效剂量80g/hm2、400g/hm2复配,防效达87.06%,吡唑醚菌酯和百菌清以有效剂量100g/hm2、500g/hm2复配,防效达90.85%,两者均产生复配增效作用;苜蓿锈病对株高、茎叶比和产量均产生显著影响,随着病情加重株高呈矮化趋势,茎叶比、产量损失率加大;当防效达到80%时,苜蓿锈病允许损失率为5.56%,防治经济阈值为3.4%。Control effects of 8 fungicides on alfalfa rust were studied in the field in order to screen ef- fective medicament formulas to control alfalfa rust, simulated equation was established through counting up disease index, plant height, stem-leaf ratio and yield. The results showed that Azoxystrobin mixed with Mancozeb and effective dose were respectively 80g/hm2 and 400g/hm2 , control effect was 87.06 %. Pyraelostrobin mixed with Chlorothalonil and effective dose were respectively 100g/hme , 500g/hm2 , con- trol effect was 90.85%, both the above two kinds of mixtures dispended synergy; the rust disease had sig- nificant impact on plant height, stem leaf ratio and yield, with aggravating heavily, plant height had dwarf trend, stem/leaf ratio and yield loss rate increased; when the control effect was 80%, alfalfa rust allowed loss rate was 5. 56% ; economic threshold controlling alfalfa rust was 3.4%.

关 键 词：苜蓿锈病 杀菌剂 田间防效 经济阈值 

分 类 号：S812.6[农业科学—草业科学]