DETERMINACIÓN DE LA DENSIDAD POBLACIONAL DE Meloidogyne graminicola EN LAS ETAPAS FENOLÓGICAS DE GENOTIPOS DE ARROZ.

Abstract

Rice (Oryza sativa L.), is a cereal of great importance for the feeding of our country, currently presents pest problems, causing low yields, they have also been causing high costs in its production and a decrease in the quality of the grain. This research aims to identify the population density of M. graminicola in the phenological stages in rice genotypes, which is affected by the population density of the nematode. The research was carried out at the Faculty of Agricultural Sciences of the Technical University of Babahoyo (UTB). The inoculation work was carried out in a nursery under controlled conditions, and the evaluations of nematode population densities were carried out in the Phytopathology laboratory of the FACIAG. This material used comes from interspecific and intraspecific crosses of Oryza sativa ssp. japonica x Oryza rufipogon G, and Oryza sativa ssp. japonica x Oryza sativa ssp. Japonica and a commercial variety INIAP 15. The experiment was established under a completely randomized design with a factorial arrangement of 3 x 5 (A x B) with five repetitions. Factor A corresponds to 3 phenological phases of rice, factor B to treatments (five levels of nematodes: 0, 500, 1000, 2000 and 3000). The results obtained were that the population density of M. graminicola in roots increased steadily in the flowering stage, grain filling and decreased in the harvest stage in the three genotypes studied.