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Comparative Development of Three Banana-Parasitic Nematodes On Musa Acuminata (Aaa Group) Cvs Poyo and Gros Michel Vitro-Plants

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For more content, see Nematology.

Three nematodes, Radopholus similis, Helicotylenchus multicinctus and Hoplolaimus pararobustus, parasitic on banana plants, were inoculated to Musa acuminata (AAA triploid) Poyo and Gros Michel cultivars grown from in vitro plants under tropical conditions. The experiments examined nematode penetration in the banana roots and the development of the parasite populations over a two months study. Invasion of roots by H. multicinctus and H. pararobustus was the same on the two cultivars, but Gros Michel was less quickly infested by R. similis than Poyo. The rate of multiplication of the parasites differed between the banana cultivars and the nematode species. Radopholus similis populations increased in Poyo roots, but only with the smallest inoculum of 1,000 nematodes per plant. At larger inocula the plants decayed and the nematodes failed to multiply. In Gros Michel roots, all the inocula of R. similis failed to develop. Helicotylenchus multicinctus multiplication was similar on the two cultivars. Finally, multiplication of H. pararobustus increased with increased inocula in the roots of both cultivars, and was higher in Gros Michel. It is concluded that the susceptibility of bananas of the triploid AAA group is very specific to these nematodes.

Affiliations: 1: Laboratoire de Nématologie, ORSTOM, 01 BP V51, Abidjan 01, Côte d'Ivoire


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