Potato (Solanum tuberosum L.) is one of the commodities of potential as a source of carbohydrates... more Potato (Solanum tuberosum L.) is one of the commodities of potential as a source of carbohydrates and important on Indonesia's economy. One of the constraints of potato production is soft rot disease caused by Erwinia carotovora (syn. Pectobacterium carotovorum) which is needed to be controlled. One alternative control measures is the used of bacteria Bacillus subtilis and Pseudomonas fluorescens for biological control. The purpose of this research is to know the potential of B. subtilis and P. fluorescens in single and in combination to inhibit potato soft rot diseases caused by E. carotovora. The results showed that biological control agents B. subtilis and P. fluorescens in single or in combination both of them (T3 to T17) have potential in inhibiting the growth of pathogenic E. carotovora by showing the clear zone. Biological agents provides nearly the same effect if compared with the bactericide Agrept (T2). Based on the results of the statistical analysis, the treatment 11 th and treatment 14 th showed a clear zone wider than the Agrept treatment (T2). The treatment 11 th contain combination of biological agents B. subtilis (10 9 cfu/ml) and P. fluorescens (10 5 cfu/ml), while the treatment 14 th contain combination of biological agents B. subtilis (10 7 cfu/ml) and P. fluorescens (10 5 cfu/ml).
Potato (Solanum tuberosum L.) is one of the commodities of potential as a source of carbohydrates... more Potato (Solanum tuberosum L.) is one of the commodities of potential as a source of carbohydrates and important on Indonesia's economy. One of the constraints of potato production is soft rot disease caused by Erwinia carotovora (syn. Pectobacterium carotovorum) which is needed to be controlled. One alternative control measures is the used of bacteria Bacillus subtilis and Pseudomonas fluorescens for biological control. The purpose of this research is to know the potential of B. subtilis and P. fluorescens in single and in combination to inhibit potato soft rot diseases caused by E. carotovora. The results showed that biological control agents B. subtilis and P. fluorescens in single or in combination both of them (T3 to T17) have potential in inhibiting the growth of pathogenic E. carotovora by showing the clear zone. Biological agents provides nearly the same effect if compared with the bactericide Agrept (T2). Based on the results of the statistical analysis, the treatment 11 th and treatment 14 th showed a clear zone wider than the Agrept treatment (T2). The treatment 11 th contain combination of biological agents B. subtilis (10 9 cfu/ml) and P. fluorescens (10 5 cfu/ml), while the treatment 14 th contain combination of biological agents B. subtilis (10 7 cfu/ml) and P. fluorescens (10 5 cfu/ml).
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