Aktivitas Ekstrak Metanol Daun Sembung Rambat (Mikania micrantha Kunth) Terhadap Pertumbuhan Phytophthora sp. Im5 dari Batang Jeruk Siam (Citrus nobilis var. microcarpa)

Abstract

Phytophthora sp. Im5 is a pathogenic fungi that can cause brown rot gummosis on Siam citrus plant (Citrus nobilis). This research aims to determine the optimal concentration of Mikania micrantha leaf extract to effectively inhibit fungi isolates of species Phytophthora sp. Im5 from the stem of Siam citrus tree. The research was conducted from March to May 2017 at the Laboratory of Microbiology, Faculty of Mathematics and Science Tanjungpura University Pontianak. The research used poisoning food method with Completely Randomized Design consisting of 4 treatments with 3 replications. The concentration of extract used was 0; 0,55; 0,65; and 0,75 g/ml. The research showed that methanol leaf extract of M. micrantha leaf can inhibit the growth of fungi isolates of species Phytophthora sp. Im5. Methanol extract of M. micrantha with a concentration of 0,65 g/ml gave a strong inhibitory activity against the growth of fungi isolates of species Phytophthora sp. Im5 with a percentage of 63.2%