Spatial distribution of Bactrocera(Zeugodacus) cucurbitae(Coquillett) larva on guava
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摘要: 用多种聚集度指标分析番石榴园挂果期瓜实蝇幼虫的空间分布格局。结果表明:瓜实蝇幼虫呈聚集分布型,分布的基本成分是个体群。聚集原因是由瓜实蝇幼虫的行为和环境因素引起的。田间虫口密度高低影响空间分布,虫口密度加大,番石榴果实中瓜实蝇幼虫数量差异变小。同时,建立了幼虫在番石榴果实上的理论抽样数公式,给出了不同误差、不同密度条件下的理论抽样数,并得出了序贯抽样公式。Abstract: Pattern of the spatial distribution of Bactrocera(Zeugodacus) cucurbitae(Coquillett) larva on guava was analyzed using various indices.The results showed that the pattern was aggregating and the colony was the basic distribution component.The aggregation might be caused by the behavior of B.cucurbitaelarvae,as well as,the environmental conditions.Based on the data collected,a model of sampling was established.Adequate fruit sampling size for at specific error level and density of larva is presented.The sequential sampling specimen number was calculated.
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Key words:
- Bactrocera cucurbitae /
- larva /
- spatial pattern /
- sampling model
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