Table 2.
Effect of cultivar resistance on predicted number of days after 15 July until the date in spring when the first phoma stem canker is observed and the severity of stem canker at harvest (on 15 July or on predicted harvest date) at Rothamsted, Hertfordshire, UK for winter oilseed rape crops affected with L. maculans for 2020 and 2050 climates under low (LO)- and high (HI)-emission scenarios.
| cultivar resistance (ratinga) | emission scenario | ||||
|---|---|---|---|---|---|
| baseline | 2020 LO | 2020 HI | 2050 LO | 2050 HI | |
| date of first phoma stem canker (days after 15 Jul) | |||||
| resistant (6–9) | 309 | 295 | 292 | 281 | 264 |
| susceptible (1–5) | 279 | 264 | 261 | 246 | 227 |
| mean | 296 | 275 | 278 | 257 | 242 |
| phoma stem canker severity at harvest on 15 Jul (day 196; 0–4 scale) | |||||
| resistant (6–9) | 1.14 | 1.43 | 1.49 | 1.71 | 2.04 |
| susceptible (1–5) | 1.55 | 1.83 | 1.88 | 2.11 | 2.44 |
| mean | 1.36 | 1.63 | 1.69 | 1.98 | 2.31 |
| phoma stem canker severity at predicted harvest date (0–4 scale) | |||||
| predicted harvest dateb | 190 | 186 | 185 | 178 | |
| resistant (6–9) | 1.27 | 1.22 | 1.44 | 1.56 | |
| susceptible (1–5) | 1.68 | 1.63 | 1.83 | 1.97 | |
| mean | 1.47 | 1.43 | 1.64 | 1.77 | |
a
Resistance rating on a 1–9 scale (www.hgca.com).
b
Day of the year, obtained from the predicted harvest date for winter wheat under these climate change scenarios and difference in harvest dates between winter wheat and winter oilseed rape in oC-days.