通过林间抽样调查，对落叶松球蚜侨蚜的分布规律进行了研究。结果表明：侨蚜在树冠上各冠层、各方位以及不同年龄枝段上的分布无明显差异，其空间分布属聚集型，个体间相互吸引，分布的基本成分为个体群。应用分布信息，导算出不同侨蚜密度下的最适抽样数，设计了决策防治的序贯抽样方案 Through the inter-sampling survey, the distribution rules of Aphis gossypii were studied. The results showed that there was no significant difference in the distributions of the crown aphids on the canopy, the azimuths and the branches of different ages. The spatial distribution of them was clustered, and the individuals attracted each other. The basic components of the distribution were individual groups. Applying the distribution information, we derive the optimal sampling numbers under the different density of spider population, and design a sequential sampling plan