Use of Bacillus sp. and Streptomyces sp. for biological control of some plant pathogens

Abstract

Plant parasitic fungi are major problem in agriculture that affect yield and quality of agricultural products. In this study, antagonistic effects of Streptomyces sp. and Bacillus sp. were evaluated against plant parasitic fungi Bipolaris oryzae DOAC 1760, Aspergillus flavus TISTR 3366, Phytophthora palmivora DOAC 2072 and Penicillium sp. The abilities of Streptomyces sp. and Bacillus sp. in inhibiting the growth of parasitic fungi were tested by the agar overlay method. Streptomyces sp. inhibited the radial growth of Aspergillus flavus TISTR 3366, Phytophthora palmivora DOAC 2072 and Penicillium sp was 6.58±0.54, 2.83±0.47 and 6.03±0.10, respectively.The antagonist Bacillus sp. was shown to inhibit the growth of Bipolaris oryzae DOAC 1760, Aspergillus flavus TISTR 3366 and Phytophthora palmivora DOAC 2072 was 15.53±0.67, 1.78±0.43 and 1.81±0.01, respectively. This study demonstrated that both bacteria can be used as biological control microorganisms.

Keywords

• biological control
• plant pathogens
• bacillus sp.
• streptomyces sp.