Table 4. Susceptibility of 15 strawberry anthracnose isolates to the strobilurin fungicides azoxystrobin, trifloxystrobin, and pyraclostrobin in terms of mycelial growth and spore germination.
| Isolate | EC50 (µg a.i./mL)a) | |||||
|---|---|---|---|---|---|---|
| Azoxystrobin | Trifloxystrobin | Pyraclostrobin | ||||
| Mycelium | Spore | Mycelium | Spore | Mycelium | Spore | |
| MLDH63 | >500 | >500 | >500 | >500 | 5.5±0.3 | 49.1±0.8 |
| MLDH68 | >500 | >500 | >500 | >500 | 8.9±0.1 | 39.8±0.3 |
| MLTA183 | >500 | >500 | >500 | >500 | 8.3±0.2 | 33.6±0.8 |
| HCKS11 | 391.9±8.7b) | >500 | 188.7±3.3 | >500 | 2.5±0.2 | 54.4±1.9 |
| MLDH62 | 422.3±10.3 | 447.4±8.8 | 290.8±4.7 | >500 | 3.3±0.8 | <1 |
| HCKS15 | 449.5±11.2 | >500 | 378.9±4.2 | >500 | 4.2±0.2 | 55.8±2.5 |
| NTGS35 | 55.3±2.8 | >500 | 190.8±5.3 | >500 | <1 | 37.7±2.9 |
| MLST115 | 43.1±1.6 | 347.3±3.8 | 219.2±4.3 | >500 | <1 | 43.5±1.6 |
| MLST70 | 16.4±0.3 | >500 | 210.3±3.3 | 356.4±9.7 | <1 | 33.9±1.7 |
| TCHU02 | 2.9±0.2 | 392.8±9.4 | 55.9±2.9 | 377.6±4.1 | 6.9±0.4 | 2.8±0.4 |
| NTGS20 | 8.9±0.7 | 285.3±5.5 | 33.5±1.7 | 488.5±9.8 | 8.7±0.2 | 6.7±0.2 |
| NTGS123 | 5.8±0.3 | 368.9±3.8 | 20.2±0.6 | 467.6±3.9 | 7.7±0.3 | 2.2±0.2 |
| MLDH67 | <1 | 299.8±2.7 | 22.9±0.8 | 225.8±4.1 | <1 | 24.1±1.3 |
| MLGG168 | <1 | 355.3±3.9 | 31.9±0.7 | >500 | 2.1±0.1 | 35.2±1.2 |
| TPNH20 | <1 | 32.2±0.8 | 19.6±0.2 | >500 | 1.5±0.3 | 55.7±2.2 |
a) EC50: concentration at which the inhibitive response is present in 50 percent of the population. b) Mean±standard error (n=4).