Reação de genótipos de cafeeiro (Coffea arabica L.) a Meloidogyne exigua população Sul de Minas

Abstract

The use of resistant cultivars is an economical and efficient method to prevent nematode infestation in coffee plantations. The progress of coffee resistance to Meloidogyne exigua depends on the continuous evaluations of genotypes obtained in breeding programs. The purpose of this work was to evaluate the reaction of the crossing of Icatu or Catuaí with Timor Hybrid or Catimor progenies against one population of M. exigua in the South of Minas Gerais State. This work was carried out in a greenhouse by testing fifteen genotypes and the cultivars Apoatã (IAC Robusta 2258) and Catiguá MG-3 which are resistant and the Mundo Novo 376-4 cultivar as susceptible to M. exigua. Eight-month seedlings were inoculated with 10,000 eggs per plant. The population of M. exigua per gram of root and reproductive factor (RF) were evaluated four months after inoculation. The H 504-5-8-2 and H 514 MS-Resplendor genotypes showed the same resistance as both Catiguá MG-3 and Apoatã (IAC 2258) cultivars. The resistant genotypes H 504-5-8-2 and H 514 MS-Resplendor should be evaluated against other populations of this pathogen because there may be some variability in Meloidogyne exigua populations.