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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Pathogenicity of the pinewood nematode, Bursaphelenchus xylophilus, to Japanese larch, Larix kaempferi, seedlings
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Pathogenicity of the pinewood nematode, Bursaphelenchus xylophilus, to Japanese larch, Larix kaempferi, seedlings

机译：松材线虫Bursaphelenchus xylophilus对日本落叶松，落叶松，幼苗的致病性

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摘要

Pathogenicity of the pine wood nematode, Bursaphelenchus xylophilus, to Japanese larch, Larix kaempferi, seedlings was tested with inoculation experiments under nursery conditions. Water suspensions of nematodes (mixed stages cultured on Botrytis cinerea or dispersal fourth-stage juveniles (DJ4) extracted from the adult Japanese pine sawyer, Monochamus alternatus) were injected into the stems of 2- and 3-year-old Japanese larch and Japanese black pine, Pinus thunbergii, seedlings growing in a nursery. In another treatment, Japanese pine sawyer adults holding DJ4 were released under a net that covered the upper half of the seedlings. Regardless of nematode inoculation method, Japanese larch seedlings were as susceptible as Japanese black pine seedlings to B. xylophilus under nursery conditions. The rate of disease development was similar on larch and pine seedlings. Nematode population densities were lower in the stems of dead larch seedlings than in the stems of dead pine seedlings. Histopathological observations revealed that the distribution of nematodes in the stems of dead larch seedlings was mostly limited to the cortex, phloem and cambial zone. Traumatic resin canal formation was one of the most characteristic symptoms in larch seedlings which was dissimilar to that in pine seedlings.
机译：通过在苗圃条件下的接种实验，测试了松材线虫松材线虫对日本落叶松，落叶松落叶松幼苗的致病性。将线虫的水悬液（在灰葡萄孢上培养的混合阶段，或从成年的日本松木锯手松褐天牛（Monochamus alternatus）中提取的分散的第四阶段幼体（DJ4）中注入）到2岁和3岁的日本落叶松和日本黑的茎中。松，黑松，苗圃中生长的幼苗。在另一种处理方法中，将持有DJ4的日本松木锯木工成虫在覆盖幼苗上半部分的网下释放。不管采用线虫接种方法如何，在育苗条件下，日本落叶松幼苗和日本黑松幼苗一样容易受到木糖双歧杆菌的侵害。落叶松和松树苗的疾病发生率相似。落叶松落叶树幼苗茎中的线虫种群密度低于松树落叶幼苗茎中的线虫种群密度。组织病理学观察表明，线虫在落叶松幼苗幼苗茎中的分布主要限于皮层，韧皮部和冈比亚区。外伤性树脂管形成是落叶松幼苗最典型的症状之一，与松树幼苗不同。

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