Abstract
The most important disease in many coffee production countries is rust on the leaf of coffee plant (RLCP). RLCP epidemics indicated by severity and incidence depend on the host, location and the fungi. The purpose of this research was to study the resistance of genotypes of Arabica coffee against RLCP in different locations. A field experiment with seven genotypes of Arabica coffee in four locations in Province of North Sumatra of Indonesia was carried out using a randomized complete block design with three replications. This research revealed a significant interaction between the genotype and the location on incidence of rust on branch (IRB), incidence of rust on leaf (IRL) and severity of leaf due to rust (SLR). For IRB and IRL, the role of the location was more important than the role of the genotype. For SRL, the role of the interaction was more important than the role of the genotype and the location. Genotype GN-5 had the lowest SRL. Location-3 was not conducive to the growth and development of the fungus H. vastatrix. Pathogen races were very likely to differ between locations. Based on SRL, these pathogens were not aggressive in all locations.
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