<![CDATA[Leaf rust disease caused by Hemileia vastatrix is considered as the most devastating disease in coffee plants due to it can kill the plants. The objective of this research was to determine the resistance of Liberica coffee derived from Kepulauan Meranti against leaf rust disease (H. vastatrix) that will be used as a composite variety. The research was conducted in Kedabu Rapat Village, Rangsang Pesisir Sub-district, Kepulauan Meranti in 2013 and 2014. Observations were carried out at farmer field in an area of 170 ha toward Liberica coffee that previously has been selected. Leaf rust resistance can be observed on the leaves of each selected Liberica coffee tree. The observed parameters were attack symptoms and disease intensity index (IIP). The disease intensity index (IIP) refers to the score of infected plants, i.e.: 0 = immune, 1%–29% = resistant, 30%–49% = moderate resistant, 50%–69% = moderate susceptible and 70%–100% = susceptible. The observation result on 106 selected Liberica coffee trees against H. vastatrix showed 90 trees (84.90%) were resistant, 14 trees (13.1%) were moderate resistant, and one tree (0.9%) was susceptible. The resistance of Liberica coffee is known quite stable during two years of observation.]]>
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