Table 1.
Analysis of variance for the effect of mating type, isolate, population and fungicide concentrations on the pathogenicity and fungicide tolerance of Alternaria alternata as measured by lesion size at 5th days post inoculation on detached potato leaves and the relative growth rate (RGR) of the isolates in the presence of difenoconazole or mancozeb at three concentrations to the absence of the fungicides
| DF | SS | MS | F | Pr > F | |
|---|---|---|---|---|---|
| Lesion area | |||||
| Mating type | 1 | 23.19 | 23.19 | 7.61 | 0.006 |
| Population | 6 | 124.54 | 20.76 | 6.81 | < 0.0001 |
| Isolate (population) | 223 | 2333.46 | 10.46 | 3.43 | < 0.0001 |
| Error | 606 | 1846.60 | 3.05 | ||
| Mancozeb tolerance | |||||
| Mating type | 1 | 0.001 | 0.001 | 0.11 | 0.74 |
| Population | 6 | 0.64 | 0.11 | 9.13 | < 0.001 |
| Isolate (population) | 194 | 12.52 | 0.07 | 5.54 | < 0.001 |
| Concentration | 2 | 1.51 | 0.75 | 64.77 | < 0.001 |
| Error | 1366 | 15.03 | 0.01 | ||
| Difenoconazole tolerance | |||||
| Mating type | 1 | 2.52 × 10−5 | 2.52 × 10−5 | 0.00 | 0.96 |
| Population | 6 | 0.53 | 0.09 | 8.07 | < 0.0001 |
| Isolate (population) | 187 | 5.97 | 0.03 | 2.94 | < 0.0001 |
| Concentration | 2 | 1.27 | 0.64 | 58.64 | < 0.0001 |
| Error | 1445 | 15.90 | 0.01 | ||