烟粉虱成虫在西兰花菜地种群分布型及抽样技术.pdfVIP

浙江农业学报Acta Agricuhurae Zhejiangensis 19(6)：444～448，2007 烟粉虱成虫在西兰花菜地种群分布型及抽样技术 虞轶俊 ，汪恩国2，陈林松 ，徐建章 ( 浙江省植物保护检疫局，浙江杭州310020； 临海市植物保护站，浙江临海317000； 临海市古城街道农技站，浙江临海317000) 摘 要：通过对西兰花莲座期的烟粉虱不同发生密度地块调查，取得了21组样本资料，应用聚集度指标法、I． wao法和Taylor法等对其空间分布型进行测定检验，结果表明烟粉虱成虫在西兰花秧苗上呈聚集分布，其聚 集度是随着种群密度升高而增加。其聚集原因经Blackith种群聚集均数测定，当m3．7049时，其聚集是由 于某些环境如气候、栽培条件、植株生育状况等等所引起的；当m≥3．7049时，其聚集是由害虫本身的聚集行 为与环境条件综合影响所致。在此基础上，通过几种抽样方式比较测定，以五点式为最佳，并提出了最佳理论 抽样数和最佳序贯抽样模型：N=1／D [0．8751／m+0．6753]，Tn=0．8751／[Dn0—0．6753／n]。 关键词：西兰花；烟粉虱；成虫；空间分布型；抽样技术 中图分类号：Q141 文献标识码：A 文章编号：11304—1524(2007)06一O444—05 Spatial distribution pattern and sampling technique of Bemisia tabaci adults in the broccoli fields YU Yi—jan ，WANG En—guo2，CHEN Lin-songs，XU Jian—zhangs ( Plant Protection andQuarantineBureau ofZhejiangProvince，Hangzhou310020，China： PlantProtectionStation ofLin- hai C in Zhejiang Province，Linhai，Zhejiong 317000，China； Gucheng Agricultural Technology Extension Station in Iin— hai( ，Linhai，Zhejiang 317000，China； Taozhu Agricultural Technology Extension Station in Linhai City，Linhai，Zhe一 317000，China) Abstract：Three methods of aggregated indices，1wao’S way(regressive relation by M*一m)and power law of Taylor were used to determine the spatial distribution pattern of B．tabaei adults in the broccoli field．The results showed the pattern of B．tabaci adults belonged to aggregation distribution，and aggregation indices increased with the increase of population den— sities．The cause of aggregation Was tested by Blackith’S method，when m 3．7049，the aggregation pattern was caused by some environmental factors such as climate，cultivation，plant growth and so on；When m 13．7049，the aggregation causes were induced by behaviors of the insect and environmental conditions．Based on the distribution pattern，it Was found that five points sampling was optim