Table 5.
Antibacterial activity of plant extracts against Ralstonia pseudosolanacearum sp. nov.
| Plant species | Extraction solvent |
|
|---|---|---|
| Ethanol | Acetone | |
| Inhibition zone (mm) | Inhibition zone (mm) | |
| Plant extracts Conc. 100 mg/mL | ||
| Pelargonium zonaleleaves | 18.73 ± 0.31 a | 18.60 ± 0.20 a |
| Psidium guajava leaves | 14.27 ± 0.12b | 14.13 ± 0.12b |
| Tarchonanthus camphoratus leaves | 8.40 ± 0.00c | 8.73 ± 0.30c |
| Moringa oleifera leaves | 7.37 ± 0.15 d | 7.47 ± 0.12 d |
| Moringa oleifera seeds | 7.33 ± 0.12 d | 7.33 ± 0.06 d |
| Positive controls at commercial rates | ||
| ENRICH BM (Bronopol 27 %w/w) | 18.13 ± 0.46 a | 18.13 ± 0.46 a |
| KOBE 1.2 SL (Chrysophanol 12 g/l) | 8.67 ± 0.12c | 8.67 ± 0.12c |
| Negative controls | ||
| Distilled water | 0.00 ± 0.00 e | 0.00 ± 0.00 e |
| 1 % DMSO | 0.00 ± 0.00 e | 0.00 ± 0.00 e |
| Mean | 10.20 | 9.24 |
| MSD | 0.62 | 0.60 |
| CV | 2.11 | 2.25 |
The values are average growth inhibition zones (mm) ± standard deviation from triplicates of ethanol and acetone extracts of each of the four plant materials and controls. Means within the same column having same letter(s) do not differ significantly at p ≤ 0.05, DMSO = Dimethlysulfoxide, MSD = mean square displacement, CV = coefficient of variation.