一、病害的发生及分布情况“十字花科根肿病”早在20年前就广泛的存在于欧美各国,在那里经常造成严重灾害。在我国此病菌于40年前曾首先在浙江的局部地区发生,后来在长江以南各地普遍蔓延:在我国的分布情况,以南部地区较为广泛,例如浙江、江苏、山东、安徽、江西、湖南、福建,广西以及云南等省,北部地区仅旅大地区和新疆有所报导;近几年来在西藏的局部地区已经发生危害。一九七八年秋季,我们在林芝县,对该病进行了调查。此病大约在74年、75年就有发生 First, the occurrence and distribution of disease “Crucifer clubroot” as early as 20 years ago, widespread in Europe and the United States, where often cause serious disasters. In our country, the pathogen first occurred in some areas of Zhejiang 40 years ago and later widespread in the areas south of the Yangtze River. The distribution in our country is more extensive in southern areas such as Zhejiang, Jiangsu, Shandong, Anhui, Jiangxi and Hunan provinces Fujian, Guangxi and Yunnan provinces. In the northern region, only the Luda area and Xinjiang have been reported. In recent years, some areas in Tibet have been harmed. In the autumn of 1978, we conducted a survey in Nyingchi County. The disease is about 74 years, 75 years have occurred