调查了我国部分地区农场、果园、苗圃、林场根癌病,得知根癌病(Agrobacteriumtumefacfens)普遍为害我国多种果树、林木,并且发病十分严重。几乎重茬苗圃土壤都带有根癌病菌。病菌的分离鉴定表明,葡萄的根癌土壤杆菌主要是生物3型,没有发现生物2型。鉴定中还发现苹果上也有生物3型的根癌土壤杆菌。 Investigation of some parts of our country farms, orchards, nurseries, forest farm root cancer, that root cancer (Agrobacterium tumefacfens) widespread damage to our country a variety of fruit trees, trees, and the incidence is very serious. Almost repeated crop nursery soil with root bacteria. Isolation and identification of pathogenic bacteria showed that Agrobacterium tumefaciens in grapes are mainly biological type 3 and no biological type 2 was found. Identification also found that there are also bio-type 3 apple Agrobacterium tumefaciens.