Crown dieback on elm clones after inoculation with Ophiostoma.
| Selection or cultivarz | No. of trees | Height (cm) March 1992 | Crown dieback (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Years after inoculation | |||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |||
| Am 57845 | 28 | 394 dey | 86 a | 93 a | 86 a | 85 a | 84 a | 81 a | 81 a |
| 15-87 (U × P) | 24 | 292 fg | 49 b | 44 b | 43 b | 42 b | 41 b | 40 b | 40 b |
| 6-87 (U × P) | 28 | 432 cd | 30 c | 16 c | 11 cd | 9 cde | 8 c | 7 cd | 5 d |
| 5-87 (H × 970) | 16 | 224 g | 26 cd | 17 c | 15 c | 10 cde | 9 c | 8 cd | 7 cd |
| 1-85 (U × P) | 28 | 504 ab | 22 cd | 12 cd | 6 cde | 5 cde | 4 cd | 3 d | 3 d |
| 16-87 (U × P) | 26 | 371 ef | 14 de | 8 d | 3 de | 2 de | 3 cd | 3 d | 2 d |
| ‘Frontier’ | 28 | 444 bcd | 12 ef | 12 cd | 12 cd | 15 c | 15 c | 19 c | 22 bc |
| 18-87 (U × P) | 27 | 392 de | 12 ef | 5 e | 2 e | 2 de | 1 d | 1 d | 1 d |
| 24-87 (U × P) | 28 | 369 e | 9 ef | 5 e | 2 e | 1 de | 1 d | 1 d | 1 d |
| 1-87 (H × P) | 28 | 382 de | 8 efg | 1 e | 1 e | 4 cde | 4 cd | 3 d | 2 d |
| ‘Prospector’ | 28 | 293 fg | 7 fg | 0 e | 0 e | 1 de | 0 d | 0 d | 0 d |
| 14-87 (U × P) | 28 | 458 bc | 5 h | 1 e | 0 e | 0 e | 0 d | 0 d | 0 d |
| ‘Homestead’ | 19 | 531 a | 1 h | 10 d | 10 cd | 11 cd | 11 c | 10 cd | 10 cd |
| ‘Patriot’ (U × P) | 24 | 302 f | 1 h | 0 e | 0 e | 2 de | 2 cd | 2 d | 0 d |
| Overall mean | 20 | 16 | 14 | 13 | 13 | 13 | 12 | ||
| Sig. clone (P <) | 0.0001 | 0.0001 | 0.0001 | 0.0001 | 0.0001 | 0.0001 | 0.0001 | ||