Abstract: Abstract：【OBJECTIVE】Banana Fusarium wilt was one of the most important soilborne diseases which affected the normal development of the banana industry. In order to prevent the spread of the wilt disease and protect the safety and health of the banana production, it is very important to screen and identify the pathogen which caused banana Fusarium wilt and investigate the relationship between the spore suspension concentration and the disease incidence rate;【METHOD】Through lab-screening and pot experiment to identificate the pathogen;【RESULTS】The pathogen isolated from the department of pseudo-crown of diseased banana showed a high pathogenicity from a pot experiment in which the disease incidence was 90% and mortality rate was as high as 70% on 35 days after inoculation. A close relationship between the amount of inocula in soil and the disease incidence rate of banana wilt was found and the minimal concentration that induced the banana Fusarium wilt was 103cfu /g soil. Disease incidence was increased with the increase of inocula density in soil. Until the inocula density attained to a certain degree (105cfu/g), the disease incidence would no longer increase. The numbers of pathogen in rhizosphere soil were 1.15 to 2.06 times higher than those in bulk soil in different treatments. 【CONCLUSION】It was related to background number of the pathogen in diseased soil that the banana fusarium wilt occurred or not, while the disease incidence was mainly determined by the number of the pathogen in plant rhizosphere soil. These results would be served for the diagnosis of banana wilt.

Key words: banana Fusarium wilt, pathogen, spore suspension concentration, disease severity