PENGENDALIAN PENYAKIT BUSUK LUNAK UMBI KENTANG (Erwinia carotovora) DENGAN MEMANFAATKAN AGENS HAYATI Bacillus subtilis dan Pseudomonas fluorescens

Abstract

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 11th and treatment 14th showed a clear zone
wider than the Agrept treatment (T2). The treatment 11th contain combination of
biological agents B. subtilis (109 cfu/ml) and P. fluorescens (105
cfu/ml), while the treatment 14th contain combination of biological agents B.
subtilis (107 cfu/ml) and P. fluorescens (105 cfu/ml).

Keywords: Erwinia carotovora, Bacillus subtilis and Pseudomonas fluorescens