Utilization of Nutritients and Mineral Elements in Pinus armandii by Chinese White Pine Beetle (Dendroctonus armandi) Cellulase Produced by the Symbiotic Fungus Leptographium qinlingensis of Dendroctonus armandi EFFECT OF SYMBIOTIC FUNGI OF DENDROCTONUS ARMANDI ON HOST TREES Microstructure of blue-stain fungi (Leptographium terebrantis) associated with Dendroctonus armandi in the xylem tissue of Pinus armandi Scanning Electron Microscope Observation on Antenna of Dendroctonus armandi(Coleoptera:Scolytidae) THE MYCANGIUM POSITION AND STRUCTURE OF THE BARK BEETLE DENDROCTONUS ARMANDI The Enzymes in the Secretions of Dendroctonus armandi (Scolytidae) and Their Symbiotic Fungus of Leptographium qinlingensis