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为查明越南松树枯死的原因,对越南南部的林同省,中部的承天-顺化省,北部的广宁省的思茅松、马尾松和南亚松枯死症状和原因进行了调查,分别从枯死、濒死、健康松树木质部中抽取52份样品,用于线虫分离镜检。调查发现松树在感病后,树冠部分针叶失去光泽,逐渐褪绿变黄,进而褐红干枯,最后整个树冠变为褐色或红褐色,全株枯死,针叶下垂且当年不落;随着病程的发展,松脂分泌逐渐减少,直至停止;树干上有天牛产卵刻槽,死亡的松树上有天牛的羽化孔。在抽取的松树样品中分离鉴定到了泰国伞滑刃线虫(Bursaphelenchus thailandae Brassch&Brassch-Bidasak,2002),为病原的确定和防治工作提供初步的依据。
In order to find out the causes of the dead pine tree in Vietnam, the author investigated the causes and the causes of the death of Pinus kesiya, Pinus massoniana and South Asia pine in the areas of Lam Dong province in Central Vietnam, Hueh-Hue province in Central Vietnam, Quang Ninh province in the north of China, , Dying, healthy pine xylem 52 samples were taken for nematode microscopic examination. After the pine trees were found to be susceptible to the disease, the gynostemous part of the coniferous shimmer loses its luster and gradually faded to yellow and brownish red. Finally, the entire canopy turns brown or reddish-brown, the whole plant dies, and the needles droop and fall in the same year Course of development, the secretion of turpentine gradually reduced until it stopped; the celestial beetles ovipositing trunks, the death of the pine has fecal holes of the beetles. The Bursaphelenchus thailandae Brassch & Brassch-Bidasak (2002) was isolated and identified from the extracted pine samples, providing the preliminary evidence for the identification and control of the pathogen.