The Effect of Different Control Measure on Arthropoda and Entomogenous Fungi Communities in Masson’s Pine Stand in Southern Part of Anhui Province

During the period of controlling the overwintering generation Dendrolimus punctatus in similar stands in 5 forestry farms with the different control strategy along the southern shore of Changjiang River,arthropoda and entomogenous fungi communities were surveyed.The result showed that comparing the communities of the forestry farms with Beauveria bassiana releasing every year with that in the forestry farm controlled by insecticides,the species number of pests were around 50%,the individuals were 70% or so,the ratio of natural enemy to pest species number (Ns/Ps) was 0.72～0.83,the ratio of natural enemy to pest individuls number (Nn/Pn) was 0.44～0.45,idexes of diversity (H′) fluctuated little,and population densities of D.punctatus ≤2.0 heads/tree.Within the forestry farms with alternated releasing of B.bassiana and applying insecticides,overflowed applying insecticides,and non-controlling forestry farms,the pest species number was around 60%,individual number was 70% or so, Ns/Ps was 0.46～0.54, Nn/Pn 0.23～0.34, H′ fluctuated greatly,and the population densities of D.punctatus was 6.0～10.0 heads/tree,which was over the control threshold (5 heads/tree).A long time realesing B.bassiana formulation and selecting appropriate suppression were beneficial to optimizing community structure.