Components of genetic of coffee leaf rust symptoms in genotypes of Arabica coffee (Coffea arabica L.)

Abstract Coffee is a source of income for 100 thousand coffee farmers (households) in the province of North Sumatra, Indonesia. Rust on leaf of coffee (RLC) caused huge loss in income and jobs in coffee producing countries recently. This study was aimed to study genetic components of RLC in genotypes of coffee of Arabica. This research was carried out on the garden of the Agriculture Faculty of Universitas HKBP Nommensen, Medan, Indonesia. Seven genotypes were tested for its resistance. Randomized complete blocks design was used. The result revealed that Genotype P 5 from Dairi district and P 7 from Toba Samosir district had moderate and high resistance against RLC, respectively. Genotypic variation, advance of genetic and coefficient of heritability in severity of rust on leaf (SRL) were high. RLC parameter were not correlated one another. Based on the high resistance of P 7 , genotypes performing high resistance could be found among Arabica coffee populations in North Sumatra province.