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蛴螬混合种群于白芍生长后期在田间呈聚集分布。进行X~2检验结果表明:当蛴螬虫口密度为2.5—8头/米~2时,符合负二项分布。本文还导出在不同置信度t、不同虫口密度(?)(头/株)和不同允许误差D下的理论抽样数n,对蛴螬混合种群在轻度发生(1头以下/米~2)、中度发生(2—3头/米~2)、严重发生(4—6头/米~2)和特大发生(6头以上/米~2)等不同情况下的序贯抽样模型也进行了推导。
The mixed population of 蛴 螬 aggregated and distributed in the field at the late stage of the growth of Paeonia. The result of X ~ 2 test showed that when the population density of gall beetle was 2.5-8 heads / m ~ 2, the negative binomial distribution was found. In this paper, we also deduced the theoretical sampling number n under different confidence t, different population density (? / Head) and different allowable error D, Sequential sampling models under different conditions of moderate occurrence (2-3 head / m ~ 2), severe headache (4-6 head / m ~ 2) and oversized headache (6 head / Derived.