Abstract:
The purpose of this research was isolation and identification of fungal species Neosartorya, Talaromyces and Eupenicillium from soil to control pathogen of leaf spot disease on kale caused by Alternaria brassicicola. Ten isolates of Alternaria brassicicola were isolated from leaf spot symptom on kale. Pathogenicity test was done using Kochs postulate method. These result demonstrate that A. brassicicola KAAB01 had the strongest pathogenicity. Twenty isolates of Neosartorya, Talaromyces and Eupenicillium were classified into 9 species thus Neosartorya tatenoi, Neosartorya fennelliae, Neosartorya spinosa, Talaromyces diversus, Talaromyces rugulosus, Talaromyces muroii, Talaromyces macrosporus, Eupenicillium brefledianum and Eupenicillium erubescens. The efficacy of those isolates was evaluated using dual culture with A. brassicicola. Results revealed that T. macrosporus AAP0817, N. spinosa AAP0802, E. berfledianum AAP0204 and E. berfledianum AAP0313 exhibited significant inhibition in the number of spore on the pathogen tested. Crude extracts were tested using poisoned food technique, it was found that crude ethyl acetate extract of E. berfledianum AAP0204 showed the highest inhibitory effect on number of spore. Including, the crude methanolic extract of E. berfledianum AAP0204 shown the most effective against spore germination of A. brassicicola. Benzoic acid which the major antagonistic compound was identified by GC-MS.