油桐是我国的特种经济树种之一,由于枯萎病的严重危害,使油桐生产的发展受到很大的影响。据1963年的调查,黄冕林场油桐的发病率达90%。但此病的病原菌尚未确定,所以从1963年起,我们以分离病原菌为主进行了一系列的研究,初步结果如下:(一)枯萎病的症状枯萎病有全株性枯萎和半边性枯萎两种。半边枯 Tung tree is one of the special economic tree species in our country. Due to the serious harm of Fusarium wilt, the development of Tung tree production is greatly affected. According to the survey of 1963, the incidence of tung oil tree in Huangmian Forest Farm reached 90%. However, the pathogens of this disease have not been determined yet. Therefore, a series of studies have been carried out mainly with isolation of pathogens since 1963. The preliminary results are as follows: (1) Fusarium Wilt symptoms were withered and semi-wilt Species. Half dry