Biological Characters And Control Of Banana Root-knot Nematode

Mature females, males, larvae and eggs were isolated from the infected roots and rhizosphere of banana root-knot nematode which were collated in Nanning,Guangxi. Based on morphological characters, three species were identified as Meloidogyne incognita(Kofoid and White, 1919)Chitwood, 1949; M. yavtfmca(Treub, 1885)Chitwood, 1949 and M. arenaria (Neal, 1889) Chitwood,1949. M. incognita was the dominant genera. The banana root-knot nematode completed nine generations in a year in Nanning. The duration of each generation was about 30-54 days and generations overlapping occurred obviously. The duration each generation and the population fluctuation in soil were closely correlated with the temperature and rainfall. When average day temperature was 13.5癈, the root-knot nematode finished its postinfection development within 34 days. The optium temperature for the development of eggs was 20~30癈, But it was inhibited blow 10癈 and above 35癈. The suitable temperature for hatching was 25癈, and its rate was 75.35%; The rate of latent eggs was 75.67% at 10癈; The rate of dead eggs was 81.39% at 35癈.Among the five banana cultivars were evaluated for resistance to root-knot nematode, M. AAA group Giant Cavendish Williams-F and M. AAA group Giant Cavendish Beijao showed moderate susceptibility, and M. AAA group Giant Cavendish Williams-Y, M. AAB Group Fenjao and M. AAA Group Red green showed high susceptibility to root-knot nematode. The results of control experiment showed that an available method to reduce the nematode damagewas planted with sun-baked soil. Mocap(lOG) was the most effetive nematicide to the banana root-knot nemade followed by Miral(3G) . The treatment of calcium oxide with soil was effetive to the root-knot nematode.