1964年5月至9月,我们在万县对油桐的病虫害进行了初步调查,现将调查及防治试验的结果重点叙述如下:一、病害据调查,油桐病害有根腐、枝干腐朽、枯萎、叶斑、果腐(黑疤或殭果病)、高等植物檞寄生和低等植物苔藓等7个类型约20余种。油桐的总发病率为30.8%.其中严重威胁油桐生长的是根腐病。因此, From May to September 1964, we carried out a preliminary investigation on the diseases and insect pests of tung oil in Wanxian County. The results of the investigation and prevention and control trials are mainly described as follows: I. Diseases According to the survey, there are root rots and rotten stems , Withered, leaf spots, fruit rot (black scars or stiff fruit disease), higher plant parasitic and lower plant moss 7 kinds of about 20 species. The total incidence of tung tree is 30.8% .There is a serious threat to the growth of tung oil root rot. therefore,