小麦赤霉病菌源的田间分布型和取样调查方法

Spatial Distribution Analysis of Primary Inoculum of Gibberella Zeae(Schw.) in Wheat Field and Its Sampling Method

依据关中不同地县的调查结果,以频次分布法检验,表明麦田玉米残秆的赤霉病带菌量符合负二项分布。聚集指标的测定结果是菌量为聚集分布,聚集由环境因素所造成,聚块面积为3m^2左右,聚集度与菌量成正比关系。并给出了赤霉病菌量的最佳抽样式和序贯抽样式。

Spatial distribution patterns of primary inoculum of Gibbere-lla Zeae (Schw.) Fetch on corn stalks in wheat fields is tested using field data collected from different counties and prefectures in the Central Shaanxi Province. The results show that primary inoculum of the pathogen follows Negative-Bionomial distribution.Also, the determination of aggregation indexes show that inoculum density is an aggregation distribution. Its aggregation is caused by environmental factors, and the area of 'aggregation is about 3m2. The degree of aggregation increases with an increase of inoculum density. Maenwhile, the optimal sampling formulae and sequential sampling formulae for quantitative assessment of inoculum density are given in this paper.