Table 3.
In vitro inhibition of four soilborne fungal pathogens by bacterial strains on potato dextrose agar (PDA) and mannitol/glutamate agar (MG/L).
| Strain | Inhibition index1 | ||||||
|---|---|---|---|---|---|---|---|
| F. culmorum | G. graminis tritici | R. solani AG8 | P. ultimum | ||||
| PDA | PDA | MG/L | PDA | MG/L2 | PDA | MG/L | |
| WP 4-2-2 | 10.0 c | 29.0 a | na | na | na | 8.0 b | na |
| WP 4-3-1 | na | na | na | na3 | na | na | na |
| WP 4-3-2 | 9.4 c | 18.9 b | na | na | na | na | na |
| WP 4-3-3 | na | na | na | na3 | na | na | na |
| WP 4-4-2 | 5.1 d | 18.2 bcd | na | 13.1 b | na | na | na |
| WP 4-4-6 | 8.6 cd | 9.7 c | na | na | na | na | 0.0 e |
| WP 4-5-3 | 9.9 c | 15.0 bcd | na | na | na | na | na |
| WP 4-10-4 | na | na | na | na3 | na | na | na |
| WP40 | 18.3 a | 23.4 ab | 23.6 a | 16.1 b | 8.0 c | 20.3 a | 24.6 ab |
| WP41 | 17.1 ab | 23.5 ab | 24.8 a | 16.1 b | 8.8 bc | 20.8 a | 25.7 a |
| WP42 | 14.0 b | 21.0 ab | 17.1 b | 14.1 b | 3.8 d | 20.1 a | 22.3 b |
| WW7 | na | 9.6 c | na | na | 11.0 b | na | 13.9 cd |
| PD1 | na | na | 11.3 c | na | 18.3 a | na | 16.7 c |
| 2-79 | 14.5 ab | 23.0 ab | 14.3 bc | 14.3 b | 11.4 b | 8.3 b | 13.8 cd |
| Q8r1 | 10.0 c | 18.5 bc | 16.7 b | 23.1 a | 20.0 a | 7.5 b | 12.8 de |
Inhibition index = [y/(x + y)](100), for which x is the distance from the center of the fungal plug to the leading edge of the non-inhibited fungus, and y is the distance from the center of the bacterial colony to the inhibited edge of the fungus. Values are the averages of two experiments (n = 8). na, no activity. Letters indicate significant (P < 0.05) differences among means within each column, based on Fisher's LSD (Statistix, Tallahassee, FL).
Variances between three experiments were unequal based on Bartlett's test; a representative experiment is shown (n = 4).
No activity on full-strength PDA but partial activity on ¼X PDA.