Reproducción y efecto nocivo de Meloidogyne incognita (Kofoid y White) Chitwood en Phaseolus vulgaris L. 'Cuba-Cueto-25-9'.

The objective was to determine the multiplication rate (FR) of Meloidogyne incognita (Kofoid and White) Chitwood and its effect on plant height, stem diameter, number of leaves, flowers and beans (legume) of the common bean cultivar 'Cuba Cueto 25-9'(Phaseolus vulgaris L.). The studies were carried out under semi-controlled conditions for 35 days. Three different inoculum rates (1.5, 2.5, and 5 of second stage juveniles (J2) and eggs per gram of substrate) were used by means of Initial population (Pi). The reproduction Factor (FR), Root Galling Index (IA), and the plant development parameters above mentioned were determined. The data were statistically analyzed and compared (ANOVA, Duncan (p<0.05)). The relationship between plant high, and Pi was determined by regression, using Statistic Package SAS, Version 9.0. The nematode parasite and reproduce in common bean 'CC-25-9' with values of FR=1.6, 6.1 and 6.2. The IA=3, 3.6 and 3.8 in the treatments with Pi=1.5, 2.5 and 5 (J2) and eggs x gram of substrate-1, respectively. The initial population levels (Pi) reduced plant height (R²=0.70) significantly. There were no substantial differences among the treatments; however, a tendency of the plant stem diameter and the numbers of leaves, flowers and beans to be reduced by the nematode was observed when they were compared with healthy plants. We discuss the practical importance of the use of plants belonging to the same species to evaluate the resistance/susceptibility of a cultivar to Meloidogyne spp. [ABSTRACT FROM AUTHOR]