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１９９０～１９９３年，从国内外收集的松材线虫９个株系和拟松材线虫５个株系，用皮接法接种３～６年生的松苗，测定线虫的致病性。结果表明，松材线虫的致病力明显高于拟松材线虫，其中国内的５个株系致病力最高。拟松材线虫通常不致病或致病力极低。在同一线虫种内，株系间致病力随寄主不同而不同。在寄主死亡速度上，寄主相同并死亡率相同或相近时，采自南京、广东马尾松病树上的线虫株系接种后，寄主平均死亡时间略短于其它株系。供试的８种松树，依死亡率及感病率，马尾松最为抗病，黑松、华山松最为感病。
From 1990 to 1993, 9 strains of Bursaphelenchus xylophilus and 5 strains of Bursaphelenchus xylophilus were collected from China and abroad. The pine seedlings aged 3 to 6 years were inoculated by skinning method to determine the pathogenicity of the nematodes. The results showed that the virulence of Bursaphelenchus xylophilus was significantly higher than that of the parasitic nematodes, and the five strains in China were the most virulent. Pine wood nematodes are usually not pathogenic or very pathogenic. Within the same species of nematode, the virulence of different strains varies with strains. When the hosts died and the hosts were the same and the mortality rates were the same or similar, the average host death time after inoculation with nematode strains from masson pine trees in Nanjing and Guangdong Province was slightly shorter than those in other strains. According to the mortality rate and the susceptible rate, the pine trees were the most resistant to the 8 pine trees tested, and the most susceptible was the pine and Pinus armandii.