Association between the incidence of blast in the field and the presence of Pyricularia grisea on seeds in rice

Abstract

This work was conducted in two cities of Minas Gerais State: Lavras, in the agricultural years of 1994 to 1997, and Lambari, from 1995 to 1997, where 16 to 25 rice (Oryza sativa L.) genotypes were tested, in two cropping systems: traditional upland and sprinkler-irrigated upland. The aim was to determine the relationship between incidence of panicle blast in the field and ocurrence of Pyricularia grisea on the harvested seeds. The occurrence of panicle blast in the field was evaluated by means of a score scale and the presence of the fungus on seed was determined by utilizing the filter paper method. There was positive and significant correlation between the genotypes in the two cropping systems. Correlation between panicle blast incidence and fungus presence on the seed was not consistent among the evaluated trials.