Abstract:
One of the common problems hampering the
cultivation of potatoes in middle latitude is the
presence of bacterium Ralstonia solanacearum
commonly known to cause wilt disease, by which
crop failure might be caused when serious attack
occurs. The objectives of the research were to
obtain the application of antagonistic microbes to
inhibit the wilt disease caused by
R.solanacearum and to increase the growth and
yield of potato in middle latitude. The research
was conducted from July to October 2012.
Antagonistic microbes were used in this research
to inhibit the bacterial wilt disease caused by
R.solanacearum on potato planted in Bumiaji,
Batu. Trichoderma viride, Streptomyces sp. and
Pseudomonas fluorescens isolates were
selected to be applied as treatments either singly
or in combination. Randomized block design was
applied on the treatment group with three
replications. The results showed that the single
application of Pseudomonas fluorescens or
combined application of Streptomyces sp. and
Trichoderma viride + Streptomyces sp. was
capable of extending incubation period 4 to 7 days
and reducing disease incidence 44.85% – 50.09%,
reducing disease intensity up to 61.23 – 72.77%,
reducing the population R.solanacearum up to 7.28
– 97.88%, increasing the number of leaves and the
marketable yield as much as 67.96 – 81.98%.
