Table 5.
Stem canker severity evaluation of selected potato cv. Russet Burbank variants in glasshouse (GH1—2010; GH2 and GH3—2011) trials. Rhizoctonia solani AG3 isolates R299, R422, and TAS1 were tested separately in each trial.
| Variants | Mean stem cankera—GH1 | Mean stem canker—GH2 | Mean stem canker—GH3 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| R299 b | R422 | TAS1 | R299 | R422 | TAS1 | R299 | R422 | TAS1 | |
| A380 | 0.63a | 0.06 | 0.06 | 0.67 | 0.67 | 0.67 | 0.00 | 0.33 | 0.33 |
| A168a | 0.94ab | 0.63 | 0.44 | — | — | — | — | — | — |
| TC-RB8 | 0.31a | 0.38 | 0.25 | 1.33 | 0.67 | 0.00 | 0.67 | 1.00 | 0.00 |
| A362 | 1.63b | 0.94 | 0.56 | — | — | — | — | — | — |
| Russet Burbank (parent) | 0.88ab | 0.63 | 0.63 | 0.33 | 0.50 | 0.00 | 0.67 | 0.67 | 0.33 |
| P | 0.02 | 0.40 | 0.149 | 0.28 | 0.91 | 0.11 | 0.31 | 0.25 | 0.69 |
| LSD (0.05) | 0.80 | ns | ns | ns | ns | ns | ns | ns | ns |
—: lines not tested within the specified trial.
aStem canker disease score—0: no disease, 1: <10% of stem area covered with lesions, 2: 10–25% of stem area covered with lesions, 3: 26–50% of stem area covered with lesions, and 4: stem girdled with lesions.
bMeans followed by the same letter within the same column are not significantly different at P = 0.05 using Fisher's LSD test; ns: nonsignificant.