Breeding for resistance to CLR took into consideration the worldwide distribution of the disease and the multiple races of the pathogen. In 1955, the governments of the United States of America (USA) and Portugal established the Coffee Rust Research Centre (CIFC) in Oeiras, Portugal to coordinate CLR research without the risk of spreading new rust races to producing countries. Resistance to CLR is inferred from Flor’s Gene-for-Gene concept, which states that for every major gene-conditioning resistance in the plant, there is a corre-sponding gene-conditioning virulence in the pathogen[34]The resistance genes in the host are designated ‘‘SH’’ genes while the virulence genes in the pathogen are designated ‘‘v’’.Resistance genes SH1–9 have been characterized and virulence genes v 1–9 have been inferred