胶园六点始叶螨Iwao序贯抽样技术  

Sequential sampling technique for Eotetranychus sexmaculatus on rubber trees

作　　者：蔡笃程[1] 邬国良[1] 

机构地区：[1]海南大学环境与植物保护学院,儋州571737

出　　处：《植物保护》2008年第5期143-145,共3页Plant Protection

摘　　要：介绍六点始叶螨(Eotetranychus sexmaculatus Riley)Iwao序贯抽样方案的设计和在田间调查中的应用。六点始叶螨的Iwao序贯抽样公式的上限T1=5n+1.64(5×[(0.135+1)×5+(1.375-1)×52])^(1/2)、下限T0=5n-1.64(5×[(0.135+1)×5+(1.375-1)×52])^(1/2)。在相同的置信水准下,序贯抽取的样本含量明显比常规抽样的少。Abstract For effective investigation of Eotetranychus sexrnaculatus Riley on rubber trees, the design and application of Iwao＇s sequential sampling technique were provided. The upper limit of Iwao＇s sequential sampling formula was determined to be T1=5n＋1.64√5×[（0.135＋1）×5＋（1.375-1）×5^2] and the lower limit T0=5n-√5×[（0.135＋1）×5＋（1.375-1）×5^2]. The sample size for sequential sampling is significantly smaller than that of regular sampling for the same confidence level.

关 键 词：六点始叶螨 1wao序贯抽样 橡胶树 

分 类 号：S433.7[农业科学—农业昆虫与害虫防治]