果树根癌病是由细菌侵人果树根系而引起的瘤状突起,它直接影响到果树根系对营养物质的吸收和传导,从而导致果树生长缓慢,树势衰弱,严重的导致叶片黄化甚至死亡。据我市育苗户调查,桃树连作育苗发病率在70～80%左右。1984年秋定植的带根癌病的毛桃砧青梅苗木,成活率仅66.9%,成 Fruit tree root cancer is caused by bacteria invade the root system of tumor-like protrusions, which directly affect the fruit tree root nutrient absorption and conduction, resulting in slow growth of fruit trees, tree weakness, leading to severe yellow leaves or even death . According to the survey of nurseries in our city, the incidence of nursery peach trees even in the 70 to 80%. Autumn planting in 1984 with root cancer peach anvil plum seedlings, the survival rate of only 66.9%, into