Abstract:

Banana and plantain are among the most important crops in the world, serving as a staple food and source of income in many developing countries. Among the major global constraints on production are several disease caused by Fusarium oxysporum f.sp. cubense. During January 2003 to June 2010, we have got virulence of 56 F. oxysporum f.sp. cubense isolates Race 4 from the 35 cities of Hainan, Guangdong, Fujian, Yunnan and Guangxi provinces. By root scratching inoculation method, we assessed the virulence of 56 race 4. The experimental results show that the selected isolates are apparently showing the virulence, which cause disease, the kind of the most serious pathogenicity is 29, the moderate-serious pathogenicity is 9 and the serious pathogenicity is 18, and their proportions is 51.79, 16.07% and 32.14%, respectively. The experimental results could be references as selecting the advantage isolates in places.