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通过聚集指标的分析,确认白杨透翅蛾ParanthrenetabaniformisRott幼虫在苗圃呈聚集分布,幼虫分布高度多集中树干中部,聚集原因是成虫产卵在树干上选择的结果。应用序贯抽样技术和确定抽样数量是产地检疫中值得注意的统计指标。
Through the analysis of aggregation index, it was confirmed that Paranthrenetabaniformis Rott larvae were clustered and distributed in the nursery. The larvae were highly concentrated in the middle part of the trunk. The reason for the aggregation was the result of the selection of adult eggs on the trunk. The application of sequential sampling techniques and the determination of sampling numbers are notable statistical indicators of origin quarantine.