Studies On The Control Ability And The Circumscription Of Parasitic Wasps Of Scolytidae Insects In Heilongjing Province

The parasitic wasps of scolytidae insects,being an important natural enemy of this group insects,have been reported on controlling them successfully abroad. The distribution of the parasitic wasps of scolytidae insects was studied systematically on the basis of referring to past research results and collecting the specimens in field and literatures. More specimens were gathered during the past three years,51 of which had been identified. The natural enemy complex of the parasitic wasps of scolytidae insects and their control ability on the scolytidae insects were further studied.There are 59 species of the parasitic wasps of scolytidae insects in Heilongjiang Province. They belong to 2 superfamilies,5 families and 26 genara. Of which 13 species are in Braconidae,Ichneumonoidea,6 species in Euritomidae,24 species in Pteromalidae,6 species in Eupelmidae,10 species in Eulophidae,Chalcidoidea. There are 53 special species in China and 43 special species in Heilongjiang Province.51 species were described,of which 2 genera are new to China (Triaspis and Doryctes). 10 species are new to science (Coeloides longicaudus,Triaspis nanchaevsis,Doryctes mongolicus,Doryctes dahuricus,Bracon ipsi,Spathins korainensis,S.yichunensis,Iphiaualx raficorpus,Calosota longgicornis andEntedon longifuniculi).The parasitic wasps of scolytidae insects and the parasitic rate of the natural enemies complex were studied in Daxinganling Mountains,Xiaoxinganling Mountains and the Southeast Mountains region of Heilongjiang Province to evaluate the control ability of the natural enemies complex. There are 13 species of parasitic wasps in Daxinganling Mountains. 4,2,6 and 1 species of which belong to Braconidae,Euritomidae,Pteromalidae and Eulophidae respectively. The parasitic rate of larvae,pupae and adults is 5.40%,8.46% and 0.33% respectively. There are 39 species of parasitic wasps in Xiaoxinganling Mountains,9,5,13,4 and 8 species of which belong to Braconidae,Euritomidae,Pteromalidae,Eupelmidae and Eulophidae respectively. The parasitic rate of larvae,pupae and adults is 20.70%,15.82% and 1.71% respectively. There are 8 species of parasitic wasps in the Southeast Mountains region,2,1,3,and 2 species of which belong to Braconidae,Euritomidae,Pteromalidae,and Eupelmidae respectively. The parasitic rate of larvae,pupae and adults is 12.47%,11.06% and 4.00% respectively. The result of the control ability of parasitic wasps comparing among three Mountain regions is thatXiaoxinganling Mountain's is more than Southeast Mountains region's and the two region's is more than Daxinganling Mountains'in controlling larve;Xiaoxinganling Mountain's is more than Southeast Mountain region's and the above two region's is more than Daxinganling Mountain's in controlling pupae;Southeast Mountains region's is more than that of Xiaoxinganling Mountain and the above two region's is more than that of Daxinganling Mountains in controlling adult The paper also analyses the distribution characteristic of the parasitic wasps in Heilongjiang Province region and the main reasons that affect the control ability of the wasps. The key factors which affect the control ability were worked out.The regression analysis on the diversity of parasitic wasps and their control ability for the hosts were studied in the log yard of Dailing forest farm in Yichun City.China.