浙江农业学报

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鲜食小芥菜烟粉虱空间分布型及抽样技术研究

  

  1. (1浙江省植物保护检疫局,浙江 杭州 310002;2浙江省临海市农技推广中心,浙江 临海 317000)
  • 出版日期:2015-04-25 发布日期:2015-04-30

The spatial distribution pattern and sampling technique of Bemisia tabaci in leafy mustard fields

  1. (1 Zhejiang Bureau of Plant Protection and Quarantine, Hangzhou 310020, China; 2 Agricultural Technology Extension Center of Linhai City, Linhai 317000, China)
  • Online:2015-04-25 Published:2015-04-30

摘要: 为揭示烟粉虱在夏季鲜食小芥菜上的空间分布信息和种群行为特征,对烟粉虱不同发生密度的夏季鲜食小芥菜地块进行了调查,应用聚集度指标法、Iwao法和Taylor法测定检验。结果表明,烟粉虱成虫在鲜食小芥菜上呈聚集分布,其聚集度随着种群密度升高而增强。Iwao的M*-m线性模型为M*=1.1181 m+0.5764,Taylor的V~m幂法则模型为V=1.1539 m1.429。聚集原因经Blackith种群聚集均数分析,当m<4.315 1时,诱发其聚集的主要因素有气候因子、栽培条件、植株生育状况等;当m≥4.315 1时,导致其聚集的主要原因是害虫本身的聚集行为与环境条件的综合影响。在以上数据的基础上得出鲜食小芥菜上烟粉虱理论抽样数公式为N=1.962/D2 (1.5764/m+0.1181),序贯抽样公式为Tn=1.5764 /(D02-0.1181/n)。

关键词: 鲜食小芥菜, 烟粉虱, 空间分布型, 抽样技术

Abstract: An investigation was carried out in fields with different Bemisia tabaci population density to study the spatial distribution and population behavior of B.tabaci(Gennadius) on the leafy mustard, Brassica juncea var.foliosa Bailey. Spatial distribution pattern of B.tabaci was determined by methods of aggregation index, Iwao linear regression model and Taylor power law model. The results showed that the spatial distribution of adult B.tabaci fitted an aggregate distribution, characterized by a raised aggregation degree as population increased. The M*-m linear model of Iwao (M*=1.1181 m+0.5764) and V~m power law model of Taylor (V=1.1539 m1.429) were established. By Blackith aggregation population mean analysis, when m<4.315 1, the aggregation pattern of B.tabaci is caused by certain environment factors such as climate, cultivation conditions, plant fertility status; when m≥4.315 1, the aggregation behavior of B.tabaci is caused by the comprehensive influence of the pest and environmental conditions. Additionally, the theoretical sampling number model N=1962/D2(1.5764/m+01181) and the sequential sampling model Tn=1.5764/(D02-0.1181/n) were proposed for B.tabaci in leafy mustard fields.

Key words: leafy mustard (Brassica juncea), Bemisia tabaci, spatial distribution pattern, sampling technique