The formulas for Determining group density and its analysis of female adult lac insect

This paper established new formulas for determining group density of female adult lac insect based on its characteristics of group distribution on host:(1)N=4/Πd2,(2)N=1/D2,(3)N/(4+π)/2πD2,those formulas can calculate the confidence interval and average value of group density of female adult lac insect.Test results has shown new those formulas ane more accurate,more simple and convenient than the traditional method for determining group density.