It was observed that the occurrences of cotton bollworm(CBW), Helicoverpa armigera (Hübner),varied from place to place while CBW broke out in Tongzhou,Jiangsu Province.The amount of egg of the 4th generation tended to decrease from the eastern coastal regions to the mid western regions,and then increased while approaching the western regions near the Yangtze River.This fact seems to be related to the distribution of soil type in this area.in order to prove this guess,a statistical analysis was made on th...