EFFECTIVE OF HOT-WATER AND HIGH TEMPERATURE TREATMENT FOR CONTROL OF THE PINE WOOD NEMATODE AND THE VECTOR OF PINE WILT DISEASE DIED WOOD

Xu fuyuan(Forest Research Institute of Jiangsu Province) Li Guangwu(The Research Institute of Forestry CAF)  

By the test of pine wilt disease dead wood submerged in hot-water, exposed to high temperature, natural drying of dead wood and hot evaporation of vapour etc. . KT50's and the temperature and exposure time required for 100% mortality are reported by the different temperature treatment. The results showed that time/mortality relationships were determined for treatment of pine wood nematode (Bursaphetenchus xylophilus) and the vector of pine sawyer beetle (Monochamus alternatus) in the dead logs (average diameter is 15.99±2.36cm). The thermal death point of the nematodes is 45℃ when the dead logs were submerged in hot-water and its thermal death point is 50℃ while the died wood exposed to high temperature. The died logs submerged in hot-water is more effective than the high temperature treatment and others. The exposure times in notwater were significantly reduced as water temperature above 45℃ (the thermal death point)was increased. When pine wilt disease dead logs submerged in hot-water at 60℃ in large dimension pool and tank treated for 2.30±0.50 hours, the mortality of B.xylophilus, and the vector of M. alternatus,Shirahoshizo insidiosus and Blastophagus piniperda all reached 100%. The methodes of treatment of pine wilt disease died wood exposed to high temperature, drying of wood and hot evaporation of vapour for control of pine wood nematodes and its vectores also vere introduced.

【Key Words】： Bursaphelenchus xylophilus Vector insect Submerged in hotwater treatment Thermal death point

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