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双条杉天牛是杉木的主要害虫之一,对杉木林危害比较严重。双条杉天牛的卵孵化为幼虫后,一钻入树皮后就很难觉察,一但发现树干上出现羽化孔或树屑虫粪时,已经危害两年以上了,即使立即采取防治措施,也难于恢复树势。因此,尽早地识别被双条杉天牛危害的杉树,是挽救虫害木的关键,也是防治双条杉天牛的前提。一、双条杉天牛危害杉木早期症状通过我们一年多的观察,双条杉天牛的幼虫在6月中旬以前,大部分在杉木树皮内韧皮部蛀食,虫道小,对杉木生长影响
Cunninghamia lanceolata is one of the main pests of Chinese fir, Cunninghamia lanceolata harms more serious. Caterpillars of Cunninghamia lanceolata hatch after larvae, it is difficult to detect a drill into the bark, but found on the trunk feathers or sawdust tree fecal excrement, it has been harmed more than two years, even immediately take preventive measures , It is difficult to restore the tree vigor. Therefore, as soon as possible to identify the cedar trees cedar damaged by double caterpillars, is the key to saving pests wood, but also the premise of the prevention and control of caterpillars. First, the two Cunninghamia lanceolata endanger the early symptoms of caterpillar By more than a year of our observation, caterpillar caterpillars larvae by mid-June, most of the pine bark within the phloem Department of eating, small worm, the growth of Chinese fir influences