烟蚜的空间分布型及抽样技术初步研究

Studies on the Spatial Distribution of Myzus persicae (sulzer) in Rape Fields and Its Sampling Technique

作者对陕北烟草上发生的烟蚜进行了空间分布型测定,为聚集分布。求得最适抽样数为N=56.91/x+16.21(三为平均每株有蚜数),当临界防治密度为平均每株有蚜5头时,序贯抽样的上、下限为T(n)=5n±7.88n^(1/2)。

The author of this artical made a survey of the way in which the worms spread on the growing tabacoo leaves in the north of Shaanxi province. He found that the worms scatter in a collective pattern, that the optimum number of samples is N = 56.91/-x± 16. 21 (-x refers to the average number of worms on each tabacoo) ,and that the positive and negative limit of the serial sample isT(n) = 5n±7. 88 n when the maximum density for prevention is five worms per tabacoo.