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引起松树枯死的,有松材线虫(以下简称Bx)和拟松材线虫(以下简称Bm),两种。它们在形态上是有区别的。♀成虫的尾端,Bx的为圆形或有短的尾尖突,而Bm的尾尖突比较长。分散型3龄幼虫,Bx的,没有尾尖突;Bm的,则具有尾尖突。就它们的地理分布而言,Bx于近20年间,首先从日本西部开始,逐渐向东部扩展,直至东北地区;Bm则从一开始就分布在日本各地(包括东北地区)。 日本的松材线虫和拟松材线虫中,有形态典型的个体,也有不少形态异常的个体。将两者中的个体进行杂交试验时,结果都没有成功。这说明日本的Bx和Bm确实是两个不同的种。如果将美国产的与日本产的Bx进行杂交,试验是成功的。这一结果进一步证实了日本的松材线虫是从北美传入的说法。
Caused pine trees dead, pine wood nematode (hereinafter referred to as Bx) and the loose pine nematode (hereinafter referred to as Bm), two kinds. They are morphologically different.尾 adult tail, Bx is round or short caudate cusps, and Bm tail cusps longer. Dispersed 3rd instar larvae, Bx, without caudate cusp, Bm with caudate cusp. In terms of their geographical distribution, Bx started in western Japan for the first time in nearly 20 years and gradually expanded to the northeast as far as the northeast. Bm was distributed throughout Japan (including the northeast region) from the very beginning. In Japan, pine wood nematode and pine wood nematode, there are typical morphological individuals, there are many abnormal morphology of individuals. When both individuals were tested for hybridization, the results were unsuccessful. This shows that Japan’s Bx and Bm are really two different species. The test was successful if the U.S.-made Bx with Japan was crossed. This result further confirms that the Japanese pine wood nematode is imported from North America.