EVALUATION OF HOST PLANT RESPONSE TO NEMATODES IN MUSA GERMPLASM IN UGANDA

P.R. Speijer, F. Ssango, D. Vuylsteke
Highland bananas (Musa AAA, 'Matooke' group) in East Africa and plantains (MusaAAB) in West and Central Africa are a major staple food. Nematodes are a major production constraint to Musa, however, the species profile varies by region. Therefore, an experiment was set up at Namulonge, where Radopholus similis and Helicotylenchus multicinctus are the dominant species, to evaluate the levels of nematode susceptibility in Musa. The susceptibility was expressed as the extent of damage to the root system and as the density of nematodes sustained. The East African Highland 'Matooke' cultivars were rather homogenous in their host plant response. However this group was quite diverse in host qualities for R. similis, with some cultivars supporting a high density. The plantain group was diverse in host plant response and supported relative a low density of nematodes. However, this low density may be a result of a highly susceptible root system, unable to sustain a high density. The MusaAAA cultivars Gros Michel and Valery are extremes in host response to nematodes, i.e., Gros Michel was among the least damaged cultivars and supported a low R. similis density, while Valery was among the most damaged and supported a high density. The cultivar Pisang Awak may have expressed a hypersensitive response. The plantain hybrids showed a wide range in level of destruction of the root system from similar to Cardaba or exceeding Valery. The banana hybrid was similar in host plant response to Cardaba. The plantain hybrids were generally equally good or better hosts for R. similis and H. multicinctus, when compared to the plantains.
Speijer, P.R., Ssango, F. and Vuylsteke, D. (2000). EVALUATION OF HOST PLANT RESPONSE TO NEMATODES IN MUSA GERMPLASM IN UGANDA. Acta Hortic. 540, 225-232
DOI: 10.17660/ActaHortic.2000.540.25
https://doi.org/10.17660/ActaHortic.2000.540.25
damage assessment, damage index, Helicotylenchus multicinctus, Radopholus similis, rhizome necrosis, root necrosis.

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