Seleção de progênies F4 de cafeeiros com resistência à ferrugem em Machado-MG

Abstract

In this study we aimed to evaluate and select coffee progenies at F4 generation, under field conditions, in order to obtain rust resistant cultivars, cercospora leaf spot resistant and agronomic characteristics superior to traditional cultivars. We evaluated 33 progenies developed by the Genetic Improvement Program of Coffee in Minas Gerais, coordinated by EPAMIG, obtained from a cross among the cultivars Icatu group with Catuaí Amarelo IAC 62 and IAC 17 and the progenies IAC 5002 and IAC 5010, with three more susceptible controls cultivars. The experimental design used was a randomized block with four replications with ten plants per plot and spacing of 3.0 m and 0.80 m between the lines and between plants, respectively. The experiment was installed in 2007 on Experimental Farm EPAMIG in Machado - Minas Gerais. The following characteristics were analyzed: production (bags.ha-1), percentage of grains retained in sieve "17 and up" and vegetative vigor during the years 2010, 2011, 2012 and 2013; incidence and severity of rust and cercospora leaf spot incidence were evaluated in 2013. Based on the results obtained, it can be seen that the progenies have variability for the analyzed characteristics. We conclude that the H 141-17-46 progenies Cova 8, H 41-26-48 Cova 14 and H 141-10-10 Cova 5 showed the highest value of productivity on the average of four periods of time, remaining in the group of the most productive over the years, and low incidence and severity of rust, low incidence of cercospora leaf spot and high vegetative vigor, proving to be able to select these progenies in the studied population and advancing generations.