On the basis of the m* -m relationship,the spatial pattern of cotton bollworm eggs fits the negative binomial distribution.The reasons for aggregation,eggs mortality on cotton plant,and mean colony size,etc.are analyzed with the parameters of aggregation k and mean crowding m*.The result shows that the aggregation of eggs seems to be due to some environmental effects as the mean density per plant is less than about 2.4,and beyond this,the asgregation may be due both to active aggregation by the adults and t...