Abstract: The factors which lead to kiwifruit bacterial canker were investigated in 30 orchards of 10 villages in 5 major kiwifruit producing regions( Jiangshan， Shangyu， Taishun， Ninghai， Tongxiang） in Zhejiang province.The main results were as follows: Through the analysis of the features of Pseudomonas syringae pv. Actinidiae（Psa）， there was a close relation between the variety and the degree of the disease. Among the 5 varieties （Hongyang， Bruno， Xuxiang， White and Jinfeng）， Hongyang was most susceptible to Psa， which was infected 100% pathogenicity in some orchards in the second year after field planting. In addition， as age increases and tree vigor decreases， the percent of the disease showed a rising trend. The trees with large capacity among the same age orchards had lower tree vigor and higher disease incidence rate. The disease incidence rate and disease index， in which there were significant differences between sunny slope and shady slope at the same altitude， increased with altitude increasing to a certain degree. And different regions had different disease degrees. The site condition, management and irrigation affected the degree of the disease obviously except the meteorological factors of the fields.

Key words: kiwifruit, Pseudomonas syringae pv. Actinidiae, Zhejiang province, disease investigation