Table 2.
Effect of pea broth on the plant protection efficacy of Lysobacter capsici AZ78.
| Experiment 1 | Disease Severity (%) | Disease Incidence (%) | Cell Density (log10 CFU g-1 of leaf) |
|---|---|---|---|
| H2O | 24.7 ± 2.3a | 100 ± 0a | 0 ± 0c |
| PB | 21.7 ± 4.2a | 100 ± 0a | 0 ± 0c |
| PB + L. capsici AZ78 | 3.4 ± 0.8c | 47.9 ± 6.2c | 5.5 ± 0.3a |
| L. capsici AZ78 | 7.9 ± 1.4b | 87.0 ± 1.4b | 4.2 ±0.1b |
| Experiment 2 | Disease Severity (%) | Disease Incidence (%) | Cell Density (log10 CFU g-1 of leaf) |
| H2O | 29.3 ± 5.0a | 100 ± 0a | 0 ± 0c |
| PB | 30.2 ± 4.4a | 100 ± 0a | 0 ± 0c |
| PB + L. capsici AZ78 | 0.8 ± 0.2c | 10.7 ± 2.7c | 6.2 ± 0.1a |
| L. capsici AZ78 | 2.5 ± 0.3b | 43.1 ± 5.2b | 5.3 ± 0.1b |
The treatments applied to grapevine plants were: distilled water (H2O), pea broth (PB), L. capsici AZ78 (1 × 108 cells/ml) and the combination of pea broth and L. capsici AZ78 (1 × 108 cells/ml). Disease severity (% of abaxial leaf area covered with sporulating lesions) and disease incidence (% of leaves with visible sporulation) were evaluated seven days after P. viticola inoculation. The density of L. capsici AZ78 cells residing on grapevine leaves was evaluated using a dilution plating method. Two separate trials (Experiment 1 and Experiment 2; [F-test; P = 0.004]) were carried out and six plants (replicates) were used for each treatment. Mean ± standard error values are reported in the table. Different letters indicate significant differences according to Tukey’s test (α = 0.05).