Spacial Pattern and Sampling Technique of Myzus persicae (Sulzer)in Tobacco Field

The spacial pattern of Myzus persicae (Sulzer) in tobacco field was analyzed with the α, β and some indexes of social degree in Iwao m^*-m model of statistical parameter of spacial distribution, and the sampling technique was discussed as well.The results showed that the spacial pattern of Myzus persicae (Sulzer) in tobacco filed was social.Based on that, the theoretical number of sampling for numerical estimation of Myzus persicae (Sulzer) at different population density was put forward.