Efficacy of Pseudomonas flourescens and Bacillus sp. in reducing scab disease caused Streptomyces scabies on potato
2007
Giyanto | Tjahjono, B. | Triyono, R., Bogor Agricultural Univ., Jalan Kamper Kampus IPB, Damarga, Bogor 16680 (Indonesia). Lab. of Plant Bacteriology
Common scab caused by Streptomyces scabies is world wide and responsible for potatoes tuber damage in most potato producing countries were 80% of tuber damage has been reported. Experiments were conducted to assess the potential of Pseudomonas flourescens and Bacillus sp. as biocontrol agents to control this disease. The study was conducted on Dieng Mountain,Central Java with four treatment and four replications both on Granola and Khan 17 cultivars. Plot A(control)were fertilized at the same amount of fertilizer applied by local farmer, while plot B, C, and D were treated as the same as plot A, but tubers were treated with Pseudomonas flourescens, Bacillus sp. and P. flourescens + Bacillus sp just before planting. The treatment of biocontrol agents, especially Bacillus sp significantly reduced diseases intensity, increased the population and the diversity of microbes(bacteria)both on Granola and Klon varieties. On Granola varieties, the disease intensity in plot A,B,C, and D were 83.36, 75.55, 72.58, and 73.43%, respectively, showing significant suppression of the scab disease, the similar phenomenon also shown on Klon 17 varieties. Microbe diversities and population analysis showed that plots C has the highest microbe diversity and the highest total microbe population for both Granola and Klon 17 varieties. This could assume that high microbe diversities and population has strong effect in lowering disease severity. Overall, tuber weight analysis showed no difference among the treatment. This showed that antagonist bacteria has no effect on potato production.
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