Caracterização de reação genótipos de milho e sorgo aos nematoides Pratylenchus brachyurus, Meloidogyne incognita e M. javanica.

Abstract

The cultivation of corn and sorghum crops plays important roles in Brazilian agriculture, but one of the most pressing issues faced by farmers is the growing infestation of phytonematodes. This study aimed to evaluate the host suitability of corn and sorghum genotypes to the phytonematodes Meloidogyne incognita, M. javanica, and Pratylenchus brachyurus. The experiment was conducted in the greenhouse of the Federal University of Uberlândia, at the Institute of Agricultural Sciences (ICIAG), on the Umuarama Campus. Ten corn genotypes, four sorghum genotypes, and the soybean NS 6010 IPRO as a susceptibility standard were tested, using a completely randomized experimental design with five replications. The analysis of Meloidogyne spp. and Pratylenchus nematode populations was conducted 60 and 90 days after inoculation, involving the extraction of eggs and juveniles. After extraction, the counts were performed, and the Reproduction Factor (RF) was calculated. Thus, it can be concluded that the most promising genotypes are the corn cultivars with the codes M6 and M9, which showed good results for all three nematodes in the experiment. Regarding the sorghum genotypes, all were moderately resistant to the nematode Pratylenchus brachyurus.