Effect of Radopholus similis, Pratylenchus araucensis, Meloidogyne spp. and their interaction on Musa AAB 'Dominico Hartón' seedlings.

The effect of Radopholus similis, Pratylenchus araucensis, Meloidogyne spp., and their interaction was evaluated in seedlings of Musa AAB 'Dominico Hartón'. The study was conducted in a nursery in Palestina, Caldas department, Colombia. Forty-day-old plantain seedlings were infected separately with 750, 1,500, 2,250 and 3,000 of each species of nematodes/plant. Two experiments were conducted to evaluate the damage of R. similis, P. araucensis, Meloidogyne spp. and the mixture of 750 R. similis + 750 P. araucensis + 750 Meloidogyne spp. compared with the mixture of different proportions (1,500, 2,250 and 3,000 of each species of nematodes). Noninfected plants were included as a control treatment, for a total of 17 treatments in a randomized complete block design with ten replications. Twelve weeks after inoculation, all nematodes, both alone and in combination, reduced (p < 0.05) plantain dry root and shoot weight. In two experiments, R. similis, P. araucensis, and Meloidogyne spp. alone, each with a population density of 3,000, reduced (p < 0.05) root dry weight by 32.5%, 9.5% and 49%, respectively, and decreased (p < 0.05) shoot dry weight by 21.5%, 23%, and 31.5%, respectively, compared to the control. The interaction of nematodes with the lowest population decreased root (33%) and shoot (21%) weight. We conclude that the growth of 'Dominico Hartón' seedlings was affected by plant-parasitic nematodes, but the greatest damage occurred with concomitant nematode infection.