Ralstonia solanacearum, the causal agent of bacterial wilt disease, ranks among the most devastating pathogen in solanaceaus crops. In West Sumatra, the bacterial decreased tomato production up to 11 % in 2014. This reduction could potentially occur annually due to the wide range of host and destructive levels of R. Solanacearum. One of the efforts to suppress R. solanacearum is by utilizing the indigenous biological agents. In several cases, bacterial group of Pseudomonas fluorescens (Pf) has been reported suppress some soilborne pathogens regarding to its ability to produce secondary metabolite such as siderofor and HCN and to dissolve phosphate. This study aimed to select Pf bacterial thus produce secondary metabolite and dissolve phosphate. Pf was isolated from soil at the rhizosphere of tomato grown in severely attacked (>30%) by R. solanacearum in the District of Payakumbuh and a healthy site in the District of Tanah Datar. Both of the districts are in the region of The Province of West Sumatra Indonesia. The observation parameters were the production of siderophore, HCN and soluble phosphate. From 24 of collected Pf isolates, 16 were able to produce siderophore, HCN and to dissolve phosphate. The results showed that isolate Pf-Stj11 derived from the healthy tomato plant grown in infected soil by R. solanacearum produced the highest siderophore with absorbance was 1.776. While higher HCN was produced by isolates Pf-Stj3 and Pf-Stj8 of tomato diseased plant grown in severely infected soil by R. solanacearum as well as Pf-Stj9 and Pf-Stj1 from the healthy tomato plant grown in infected soil by R. solanacearum. The highest ability to dissolve phosphate was by the isolate Pf-Stj4 from tomato diseased plant grown in severely infected soil by R. solanacearum.
