Table 3. Comparison of phoma stem canker severity and seed yield between different oilseed rape cultivars grown in winter oilseed rape field experiments at 13 sites over three growing seasons (2010/2011, 2011/2012, 2012/2013).
| Cultivara | Phoma stem canker | Seed yield | ||
|---|---|---|---|---|
| Severityb | Relative severity (%)c |
Yield (t/ha) | Relative yield (%)c | |
| Adriana (Rlm4 + QR) | 1.42ded | 68.5de | 4.28bc | 106.20c |
| Bilbao (Rlm4) | 2.13bc | 118bc | 4.40ab | 109.19bc |
| Capitol (Rlm1) | 2.42b | 136.7b | 3.52d | 87.30e |
| DK Cabernet (Rlm1 + QR) | 1.39de | 69.6de | 4.56ab | 114.17ab |
| Drakkar (no R, no QR) | 4.26a | 277.4a | 1.96e | 48.20f |
| Es-Astrid (QR) | 1.09ef | 51.4ef | 4.49ab | 111.96bc |
| Excel (Rlm7 + QR) | 0.85f | 36.2f | 4.79a | 118.87a |
| NK Grandia (QR) | 1.73cd | 96.3c | 4.39ab | 109.07bc |
| Roxet (Rlm7) | 0.95ef | 45.8ef | 3.84cd | 95.04d |
| SEDe | 0.27 | 12.95 | 0.22 | 3.28 |
a Oilseed rape cultivars with or without an Rlm gene against Leptosphaeria maculans in a background with or without quantitative resistance (QR) were used in field experiments.
bThe severity of phoma stem canker was assessed in summer before harvest on a 0−6 scale modified from that of Lô-Pelzer et al. (2009).
cThe relative cultivar stem canker severity or seed yield was calculated as a percentage, based on the relationships between stem canker severity score or seed yield for individual cultivars and the mean stem canker severity score or yield for all cultivars at a given site.
dDifferent letters indicate a significant difference at P ≤0.05.
eSED is the standard error of the difference used to calculate the least significance difference (LSD) at significance level P ≤0.05 when multiple comparisons were done.