Monitoring Fusarium wilt in Hainan Province and preliminary pathogen characterisation
2011
Zhang, X. | Zhang, H. | Xie, Y. | Pu, J. | Qi, Y. | Lu, Y.
In 2008, the status of Fusarium wilt on banana, caused by subtropical Fusarium oxysporum f. sp. cubense (Foc) race 4, in Hainan Province, China was monitored. The disease was found in 14 out of 18 cities and counties. The monitored area was 687.4 ha, out of which 53.8 ha were affected with a total of 33,268 infected banana plants. The disease affected ‘Baxijiao’ (AAA), ‘Williams’ (AAA), ‘Fenjiao’ (ABB) and ‘Gaogangongjiao’ (AA). Diseased plants were eradicated and replaced by paddy rice, corn or disease-resistant cultivars, like ‘Aigangongjiao’ (AA), ‘Nongke No. 1’ (AAA), ‘Guangfen No. 2’ (ABB) and others, as a control measure. Pathogenicity tests confirmed that twelve Foc strains isolated from ‘Fenjiao’ belonged to race 1, and six Foc strains from ‘Baxijiao’ were race 4. The disease severity index varied among strains. RAPD analysis could differentiate geographic origins of strains of race 1 and race 4, approximately distinguish strains of race 1 and race 4. The twelve race 1 strains isolated from ‘Fenjiao’ were assigned to VCG 1, and the six race 4 strains isolated from ‘Baxijiao’ were assigned to VCG 2, showing that vegetative compatibility groups of Foc strains are related to race (Note: VCG 1 and 2 codes were established by the research team, because the nit testers for VCG analyses of Foc were not available).
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