A Possibility of using Antagonistic Bacterial Isolates in Controlling Fusarium Wilt of Chrysanth (Chrysanthemum sp.)

Abstract

One problem faced by chrysant farmer in North Sumatera, Indonesia is to control fungal disease caused by Fusarium oxysproum. The aims of this study were to know antagonistic bacterial isolates to reduce fungal disease caused by F. oxysporum and to know the isolates ability in producing plant growth hormon such as indole acetic acid and in solubilizing phosphate. Eight bacterial strains, collection of Laboratory of Microbiology, Universitas Sumatera Utara were tested against F. oxysporum in dual culture assay. Two bacterial isolates, SP1, closely related to Bacillus amyloliquefaciens strain MPA 1034 and SP7R, closely related to Pseudomonas versuta strain L10.10 showed to reduce fusarium wilt in chrysant along with production of indole acetic acid and phosphate solubilizing properties in vitro. Application of the two antagonistic bacterial isolates resulted in considerably decrease of disease intensity caused by F. oxysporum. The results showed that utilization of bacterial isolate to promote chrysant performance is promising in the next future.

Keywords

• antagonistic bacteria
• biological control
• plant growth promoting
• chrysanthemum sp.