Potensi Bakteri Kitinolitik dalam Pengendalian Aspergillus niger Penyebab Penyakit Busuk Pangkal Akar pada Tanaman Kacang Tanah

Abstract

A study of chitinolytic bacteria ability to control Aspergillus niger, a causal agent of basal root rot of peanut seedlings has been conducted in Laboratory of Observation Pest and Disease, Medan Johor, UPT. Protection of Crops and Horticulture 1, and Laboratory of Microbiology, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Sumatera Utara, Medan. The purpose of the study was to evaluate the ability of chitinolytic bacteria Bacillus sp. BK13, Enterobacter sp. BK15, Bacillus sp. BK17, Enterobacter cloacae LK08, Bacillus sp. KR05, and Enterobacter sp. PB17 to inhibit the growth of A. niger on the peanut seedling. Antagonistic test showed that the most effective bacteria in inhibiting the growth of A. niger was BK15 with inhibition zone of 2,88 cm and BK13 with inhibition zone of 2,69 cm, whereas the least effective bacteria was BK17, with inhibition zone of 2,30 cm. Chitinolytic bacterial isolates used to cover peanut seed through soaking enabled to reduce seed basal root rot. BK15 had the highest inhibition to reduce the basal root rot by 58,82% while the lowest inhibition was BK13 by 47,06%.