Resumo

TORRADO-JAIME, Mayary  e  CASTANO-ZAPATA, Jairo. Incidence of nematodes on plantain in different plant phenological stages. Agron. colomb. [online]. 2009, vol.27, n.2, pp.237-244. ISSN 0120-9965.

Nematodes are among the most important problems affecting plantain in Colombia. However, thorough knowledge of the way plant life cycle and environmental conditions affect the timing of their development is still scarce. Thus, a contribution to an improved understanding of this problem was the main objective of the present research. The work was conducted at Montelindo experimental station (1,050 m a.s.l., 22.8°C, relative humidity of 76%, and 2,200 mm of rain). For the mentioned purpose, rhizomes of Dominico Harton and Africa varieties, and of hybrids FHIA-20 and FHIA-21, were planted in a 3 x 2 m array, and managed under conventional agronomical practices. A random block experimental design with four repetitions finally sparing ten useful plants was applied. Nematodes were initially sampled from the planting soil, and then every two months in soil and roots, applying the sugar centrifugation flotation procedure. The behavior of those populations was studied with regard to climatic factors along five phenological stages: sprouting and emergence, seedling, pre-bloom, bloom and bunch filling and physiological maturity. The main nematode taxa found were Meloidogyne spp., Radopholus similis, and Helicotylenchus spp., among which the latter two exhibited higher incidence when the plants reached physiological maturity. In 'Africa', Radopholus showed three peaks of incidence: seedling, pre-bloom and physiological maturity. For the hybrids, the highest population of Meloidogyne was observed at bloom; and for the cultivars at pre-bloom. Precipitation had a positive influence on the studied nematode populations.

Palavras-chave : Musa spp.; hybrids; varieties; Radopholus similis; Meloidogyne spp.; Helicotylenchus spp..

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