Pemanfaatan Bakteri Kitinolitik dalam Menghambat Pertumbuhan Curvularia sp. Penyebab Penyakit Bercak Daun pada Tanaman Mentimun

Abstract

A study about the utilization of chitinolytic bacteria isolates to inhibit growth of Curvularia sp. that cause leaf spot disease of cucumber has been done in Laboratoryof observation pest and disease, Medan Johor, UPT-Balai Protection Plant and Horticulture1 and Laboratory Microbiology Departement of Biology, Faculty of Mathematics and Natural Sciences, University of Sumatera Utara, Medan. Six chitinolytic isolates were testedin vitro to inhibit growth of Curvularia sp.. The result showed that Bacillus sp. BK13 inhibit more with inhibition zone of 2,75 cm and Enterobacter sp. BK15 with inhibition zone of 2,55 cm, whereasEnterobacter sp. PB17 the lowest inhibit with inhibition zone by 1,3 cm. Soaking seeds treatment in chitinolytic bacteria suspension was able to reduce the percentage of leaf spot. Enterobacter sp. BK15 has the highest ability to inhibit leaf spotattack, by reducing 50%.