Résumé
Host status of Yellow Sigatoka and Black Leaf Streak disease resistant new hybrids from Cirad, (cvs 916, 918, 919, 920, 921 and 924) to the burrowing nematode Radopholus similis and to the lesion nematode Pratylenchus coffeae were assessed under controlled conditions in a growth chamber on andosol, at 24-28°C and 80% RH. Banana plants produced by tissue culture were allowed to acclimate and grow for 6 weeks prior to inoculation. Susceptibility to nematodes was evaluated by inoculating the hybrid plants with 400 nematodes per plant. Fotty-five days after inoculation, the nematodes were extracted from the entire root system carefully collected and weighted separately. Two CyS of Grande Naine (Musa AAA, Cavendish subgroup, ITC1256 and cv902) and one cv ofYangambi Km5 (Musa AAA, Ibota subgroup, ITC1123) were used as susceptible and resistant controls, respectively. Results on reproductive factors (Rfs) and root infestations showed that three ofthese hybrids (cvs 918, 919, 924) were not different from the resistant control Yangambi K.m5 with a lower reproduction of R. similis. Similarly, four ofthese hybrids (cvs 918, 919, 920, 924) showed a lower multiplication of P. coffeae, not different fi'otu the resistant control. These preliminary results are indicatives of a partial resistance of CYS 918, 919 and 924 to both nematodes, adding an important extra value to these hybrids, formerly breed to resist to Mycosphaerella leaf spot diseases. (Texte intégral)