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北京南口农场山定子砧苹果树受线虫侵害严重。田间树势调查结果表明:病树长势衰退,产量降低,品质下降;补植的幼树表现出再植病症状。田间根系症状调查结果表明:病树根系生长异常,表现出典型的短粗根病症状,即受害幼根不呈延伸生长,而是在生长中不断分枝,以致最后形成须状丛簇根,每年只在新根旺长期长出一小段具有吸收功能的白色、毛笔尖状的新根。盆栽幼苗接种试验表明:南京毛刺线虫的侵染严重影响了山定子幼苗的形态建成,且使根系表现出短粗根病症状,从而证明南京毛刺线虫(Trichodorus nanjingensis Liu＆Chen)是导致该场苹果树势衰退、再植病和短粗根病的主要病原。
Beijing South Farm Hill mountain anvil apple tree by nematode damage. Field tree potential survey results show that: the decline of diseased trees, reduced yield, quality decline; replanting of young trees show signs of replant disease. The investigation of root symptom in the field showed that the diseased root system grew abnormally and showed the typical symptoms of stubby root disease, that is, the diseased root did not extend, but branched continuously in growth, resulting in the formation of whisker cluster root, Each year only a short period of absorption in the new Roots long white, brush-shaped new roots. Inoculation experiments with potted seedlings showed that the infection of Trichodina nanjinggensis was severely impacted on the morphogenesis of seedlings of Rhododendron simonii, and the root system showed the symptoms of Rhizoctonia so as to prove that Trichodorus nanjingensis Liu & The main pathogen of recession, replantation and stubby disease.