FACTORS OF DISEASE DEVELOPMENT CONTROL IN PINE WILT DISEASE

为阐明松材线虫病发病控制因素与寄主细胞生理状态的关系，研究了松材线虫与松树寄主细胞的反应。(1)对松材线虫病敏感的寄主，其表面张力随病害的发展而降低。(2)松材线虫侵染后表面活性剂和草酸含量增加，这些物质可诱导活松木中的空穴形成。(3)病害的发生与活材中乙烯的产生有密切关系。(4)空穴的发生导致活材含水率的降低。(5)认为抗光合作用处理导致的低聚糖减少与病害发展有密切关系，明确了松材线虫病发病过程中与空化有关的黑盒现象。

To elucidate the relationship between factors of disease development control and physiological status of host cells in the pine wilt disease, reactions between pine wood nematode and pine host cells were examined.(1) Susceptible hosts to pine wilt disease decrease their surface tension with the development of disease.(2) Surfactants and oxalic acid increase after infection of pine wood nematode.These substances induce cavitation in the living pine wood.(3) The disease development has a close relation with ethylene production in the living wood.(4) Incidence ofcavitation induces the decrease of wood moisture content in the living wood.(5) Decrease of oligosaccharide by antiphotosynthesis treatments is considered to have a close relationship with disease development.From the results, black boxes in disease development of pine wilt disease was made clear in connection with cavitaion.