Studies on the Pathogen and Pathogenesis Regularity of Root Cancer in Kiwifruit

This paper deals with isolation and cultivation of the pathogen of crown gall in kiwifruit, and studies the morphological, physiological, biochemical and serological characteristics of the pathogen. The relationship between occurrence of the disease and the ages of tree, soil, cultivars and the lever of management is investigated. The results show that the pathogen of crown gall is Agrobacterium tumefaciens, and the occurrence of the disease is severer in alkaline soil and clay than in acid soil, and severer in bad managed orchard than well managed orchard.