Wide-spread planting in Japan in the 20th century of pines, Formosan cypress and Japanese red cedar (Cryptomeria japonica) has also assisted the rapid advance of nematode disease in Japan's pine forests.
日本在二十世紀開始大量種植松樹、紅檜、柳衫，也讓線蟲得以在日本松林裡掀起風暴。