随着杉木(cunninghamia lanceolata)人工林面积的不断扩大,近年来在我国南方若干地区出现了所谓杉木黄化病,表现为杉木生长衰退,枝叶自下而上逐渐枯黄,以至最后整株枯死,与此同时,它的根系发育不良并且逐渐腐烂。发病的林分在林区内呈块状、带 With the continuous expansion of plantation area of ​​cunninghamia lanceolata, so-called Chinese fir yellow disease appeared in some areas in southern China in recent years, showing the decline of Chinese fir growth, the gradual yellowing of branches and leaves from bottom to top, At the same time, its roots are poorly developed and gradually decayed. The disease in the forest was a block, with