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为了探讨油松毛虫(Dendrolimus tabulaeformis Tsai et Liu)在陕西黄龙山林区的发生规律,笔者于1963—1966年在黄龙北寺山林场进行了初步观察,兹就所获资料,整理分析如下。一、成虫迁飞能力成虫迁飞是油松毛虫扩散的主要形式之一。据1964年调查,在照离重灾区(北寺山)1700米远的麻子山(轻灾区)和2300米远的梅家山(无虫区),由
In order to investigate the occurrence of Dendrolimus tabulaeformis Tsai et Liu in Huanglongshan forest area of Shaanxi province, the author made a preliminary observation from 1963 to 1966 in the forest farm of Huanglongbei Temple in Huanglong Mountain. The data obtained are summarized as follows. First, the ability of adults to migrate Migratory adults is one of the main forms of spread of pine caterpillars. According to a survey conducted in 1964, in the areas of Mazi Mountain (light stricken area) 1,700 meters far away from Meijishan (Beisu Mountain) and Meijishan (Insectless Area) at 2,300 meters,