Abstract:

Pine wood nematode Bursaphelenchus xylophilus was introduced in Changdao County, Shandong Province the only one area in northern China. Oleoresin exudation method was applied for early diagnosis of the Black Bine trees Pinus thunbergii in more than 400 hm² area in 1999. The result showed that among 600 000 pine trees, there are 935 trees with abnormal oleoresin exudation, in which 182 trees carried pine wood nematode by isolation and identification.After the diseased trees were cut down, the number of diseased and died trees caused by B.xylophilus was reduced by 97%,comparing with that in the former year. Application of oleoresin exudation method on controlling the pine wood nematode disease in practice was discussed in the paper.

Key words: Pinus thunbergii, Bursaphelenchus xylophilus, Oleoresin exudation method, Early diagnosis