Mamiya Y
J Nematol. 1988 Apr;20(2):219-26.
Pine wilt disease induced by the pinewood nematode, Bursaphelenchus xylophilus, is a great threat to pine forests in Japan. The first occurrence of the disease was reported in Nagasaki, Kyushu. During the 1930s the disease occurrence was extended in 12 prefectures, and in the 1940s the disease was found in 34 prefectures. The annual loss of pine trees increased from 30,000 m(3) to 1.2 million m(3) during these two decades. The enormous increase in timber loss in the 1970s resulted in 2.4 million m(3) of annual loss in 1979. The affected area expanded into 45 prefectures of 47 prefectures in Japan. In cool areas the disease differs in epidemiology from that in heavily infested areas in the warm regions. A national project for controlling pine wilt disease lays special emphasis on the healthy pine forests predominating throughout cool areas in northern Japan.
由松材线虫（Bursaphelenchus xylophilus）引起的松树萎蔫病对日本的松林构成了巨大威胁。该病首次发现于九州的长崎。20世纪30年代，该病在12个县蔓延，40年代在34个县被发现。在这二十年中，松树的年损失量从30000立方米增加到120万立方米。20世纪70年代木材损失的大幅增加导致1979年年损失量达到240万立方米。受灾地区扩大到日本47个县中的45个县。在凉爽地区，该病的流行病学与温暖地区重度感染地区有所不同。一项控制松树萎蔫病的国家项目特别重视日本北部凉爽地区占主导地位的健康松树林。
