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通过调查测定,在棉花各生育期内由于棉蚜为害所形成的卷叶株率的田间分布型皆不属于随机分布,多数属于负二项式分布,部分属于核心分布。经I、K、C=C_A、Iδ和M 5种聚集指标测定皆属于聚集分布。据此,建议将目前用双对角线5点取样,每点20株,共计100株的调查卷叶株率的方法,改为棋盘式或“乙”字形10点取样、每点20—25侏,共计200—250株的取样调查方法,以提高其准确性。
According to the investigation and determination, the field distribution patterns of the leaf-roll rate formed by cotton aphid infestation during each growth period of cotton are not random distribution, most of which belong to the negative binomial distribution and some belong to the core distribution. By I, K, C = C_A, Iδ and M 5 kinds of aggregation indicators are aggregated distribution. Therefore, it is suggested that the current method of sampling double-diagonal lines at 5 points with 20 strains per point and a total of 100 strains of leafy-roll plants be changed to checkerboard or “B” -shaped sampling at 10 o’clock and each point is 20-25 Jurassic, a total of 200-250 strains of sampling survey methods to improve its accuracy.