Studies on Distribution Characteristics of Chinese White Wax Scale (Ericerus pela Chavannes) on Host

The distribution of Chinese white wax scale on host relates to direction and position of the host branches. There are different distribution characteristics in different stages. During the period of the insect on leaves,the distribution of population in direction are 28.05% in east,26.55% in south,25.06% in west and 20.34% in north. The distribution of female insect in direction are 32.16% in east,27.36% in south,20.34% in north and 18.65% in west,male insect are 30.76% in west,25.84% in south,24.29% in east and 19.01% in north. The distribution of population in branch position are 65.71% in the lower part,23.95% in the middle and 13.18% in the upper. During the period of the insect on branches,the distribution of female insect in position are 49.11% in the upper part,28.80% in the middle and 21.09% in the lower part,male insect are 90.71% in the middle part,7.00% in the lower and 2.29% in the upper part.