Aiternaria blight disease severity in lilacs over a 4-year period in middle Tennessee.
| Syringa spp. | Cultivar | Mean disease severity (0–5 scale)z | Overall disease reactiony | ||||
|---|---|---|---|---|---|---|---|
| 1996 | 1997 | 1998 | 2002 | 2- to 4-year mean | |||
| S. meyeri | Palibin | 0.3 k | 1.2 i-k | 0.0 m | 1.0 j-k | 0.6 | R |
| S. meyeri | Dwarf Korean | 0.7 j-k | 0.8 j-k | 0.0 m | 1.7 h-k | 0.8 | R |
| S. vulgaris | Mme. Antoine Buchner | 1.0 i-k | 1.2 i-k | 0.6 j-m | 1.3 i-k | 1.0 | R |
| S. vulgaris | Silver King | 1.7 h-j | 1.2 i-k | 1.0 h-m | 1.0 j-k | 1.2 | MR |
| S. reticulata | Ivory Silk | 2.0 g-i | 1.6 f-j | 0.6 j-m | 1.0 j-k | 1.3 | MR |
| S. reticulata | Summer Snow | 1.7 h-j | 1.7 e-j | —— | —— | 1.7 | MR |
| S. hyacinthiflora | Pocahontas | 2.0 g-i | 1.8 e-j | 1.8 d-j | 2.0 g-j | 1.9 | MR |
| S. vulgaris | Leon Gambetta | —— | 1.7 e-j | —— | 2.3 f-i | 2.0 | MR |
| S. vulgaris | Henry Robert | 2.3 c-f | 1.5 f-j | —— | —— | 1.9 | MR |
| S. vulgaris | Sensation | 2.5 b-f | 1.2 h-k | —— | —— | 1.9 | MR |
| S. microphylla | Superba | —— | 0.0 k | 2.0 c-i | 2.7 e-h | 1.6 | MS |
| S. vulgaris | Michael Buchner | 2.7 e-h | 1.8 j-k | 1.0 h-m | 2.3 f-i | 1.9 | MS |
| S. vulgaris | Firmament | 2.7 e-h | 2.0 d-j | 0.2 l-m | 2.7 e-h | 1.9 | MS |
| S. vulgaris | Paul Thirion | 2.7 e-h | 1.7 e-j | 1.2 g-m | 2.0 g-j | 1.9 | MS |
| S. vulgaris | Charm | 2.7 e-h | 2.7 b-g | 1.2 g-m | —— | 2.0 | MS |
| S. hyacinthiflora | Excel | 2.7 e-h | 1.8 e-j | 0.4 k-m | 3.0 d-g | 2.0 | MS |
| S. vulgaris | Yankee Doodle | 2.7 a-b | 1.8 e-j | 1.2 g-m | 2.7 e-h | 2.1 | MS |
| S. josiflexa | Royalty | 2.9 d-g | 2.6 c-h | 1.2 g-m | 2.0 g-j | 2.2 | MS |
| S. vulgaris | Ludwig Spaeth | 2.7 a-b | 2.0 d-j | —— | —— | 2.3 | S |
| S. hyacinthiflora | Sister Justena | 2.9 d-g | 1.7 e-j | —— | —— | 2.3 | S |
| S. vulgaris | Ruhm Von Horstenstein | 2.3 f-h | 1.2 h-k | 2.8 a-e | 2.7 e-h | 2.3 | S |
| S. vulgaris | Macrostachys | 3.0 d-g | 2.7 b-g | 2.2 b-h | 1.7 h-k | 2.4 | S |
| S. vulgaris | Belle de Nancy | 3.7 b-e | 2.2 c-i | 0.8 i-m | 2.7 e-h | 2.3 | S |
| S. vulgaris | Albert F. Holden | 4.3 a-c | 1.8 e-j | 0.8 i-m | 3.0 d-g | 2.3 | S |
| S. prestoniae | Donald Wyman | 3.3 c-f | 2.2 c-i | 1.4 f-l | —— | 2.3 | S |
| S. vulgaris | Miss Ellen Wilmott | 3.0 d-g | 1.8 e-j | 1.2 g-m | 3.3 c-f | 2.3 | S |
| S. chinensis | Rothomagensis | 3.0 d-g | 3.2 a-d | 0.0 m | 3.7 b-e | 2.5 | S |
| S. vulgaris | Alphonse Lavallée | 3.7 b-e | 1.8 e-j | 2.6 a-f | 3.3 c-f | 2.6 | S |
| S. vulgaris | Krasavitska Moskvy | 2.7 e-h | 1.8 e-j | 3.2 a-c | 3.0 d-g | 2.7 | S |
| S. vulgaris | Edmund Boisier | 4.0 a-d | 2.0 d-j | 1.2 g-m | 3.3 c-f | 2.6 | S |
| S. vulgaris | President Grevy | 2.7 e-h | 2.4 c-i | 1.6 e-k | 4.0 a-d | 2.7 | S |
| S. vulgaris | Adelaide Dunbar | 4.0 a-d | 2.2 c-i | 1.4 f-l | 3.3 c-f | 2.8 | S |
| S. vulgaris | Charles Joly | 4.3 a-c | 3.2 a-d | 1.2 g-m | 2.7 e-h | 2.9 | S |
| S. vulgaris | President Poincare | 3.7 a-b | 2.8 b-f | 2.6 a-f | 2.3 f-i | 2.9 | S |
| S. prestoniae | Minuet | 4.7 a-b | 1.2 i-k | 3.0 a-d | —— | 3.0 | S |
| S. vulgaris | Montaigne | 4.3 a-c | 2.2 c-i | 1.8 d-j | 3.7 b-e | 3.0 | S |
| S. vulgaris | Victor Lemoine | 3.0 d-g | 3.0 a-e | —— | —— | 3.0 | S |
| S. vulgaris | Mme. F Morel | 3.7 b-e | 1.6 f-j | 2.2 b-h | 4.3 a-c | 3.0 | S |
| S. vulgaris | Charles Tenth | 4.7 a-b | 1.6 f-j | 2.2 b-h | 3.3 c-f | 3.0 | S |
| S. vulgaris | Mrs. W.E. Marshall | 4.3 a-c | 1.7 e-j | —— | 3.3 c-f | 3.1 | S |
| S. vulgaris | A.M. Brand | 4.7 a-b | 2.0 d-ij | 3.4 a-b | 2.3 f-i | 3.1 | S |
| S. vulgaris | Monge | 4.7 a-b | 2.6 c-h | 1.8 d-j | 3.3 c-f | 3.1 | S |
| S. vulgaris | Vestale | 4.7 a-b | 3.4 a-c | 2.4 b | 2.3 f-i | 3.2 | S |
| S. vulgaris | Edith Cavell | 5.0 a | 3.00 a-e | 2.6 a-f | 2.3 f-i | 3.2 | S |
| S. henryi | White Summers | 4.3 a-c | 2.2 c-i | 3.4 a-b | 3.7 b-e | 3.4 | S |
| S. prestoniae | Isabella | 4.7 a-b | 3.0 a-e | 2.1 c-i | 4.0 a-d | 3.4 | S |
| S. josiflexa | Anna Amhof | 3.0 d-g | 2.4 c-i | 3.0 a-d | 5.0 a | 3.4 | S |
| S. patula | Miss Kim | 4.3 a-c | 2.6 c-h | 3.2 a-c | 3.7 b-e | 3.5 | S |
| S. vulgaris | Avalanche | 5.0 a | 2.2 c-i | 2.6 a-f | 4.0 a-d | 3.5 | S |
| S. vulgaris | Arch McKean | 5.0 a | 1.5 f-j | 3.2 a-c | 4.7 a-b | 3.6 | S |
| S. vulgaris | President Lincoln | 5.0 a | 2.6 c-h | —— | —— | 3.8 | S |
| S. vulgaris | Katherine Havemeyer | 5.0 a | 2.6 c-h | 3.4 a-b | 4.0 a-d | 3.8 | S |
| S. prestoniae | James McFarlane | 5.0 a | 3.2 a-d | 3.4 a-b | —— | 3.9 | S |
| S. vulgaris | Mrs. Harry Bickle | 4.7 a-b | 3.0 a-e | —— | 4.7 a-b | 4.1 | S |
| S. vulgaris | Marie Finon | 5.0 a | 4.0 a-b | —— | —— | 4.5 | S |
| S. vulgaris | Marie Legraye | 5.0 a | 4.2 a | —— | —— | 4.6 | S |
| LSD | 1.2 | 1.3 | 0.9 | 1.3 | |||
↵z Disease readings of 0 = no symptoms, 1 = 10%, 2 = 11% to 25%, 3 = 26% to 50%, 4 = 51% to 75%, and 5 = 76% to 100% of the foliage showing disease symptoms.
↵y Disease reactions categorized as resistant (R), moderately resistant (MR), moderately susceptible (MS), or susceptible (S) were based on the mean disease readings obtained during the growing season in which R = 0 to 1.0, MR = 1.1 to 2.0, MS = 2.1 to 2.9, and S = 3.0 to 5.0. Disease readings greater than 2.0 during any growing season disqualified a cultivar from being considered resistant even if the 4-year mean disease reading was less than 2.0; any disease reading of 2.5 to 3.0 during any growing season was an indication of moderate susceptibility, and any reading of greater than 3.0 during a growing season was regarded as fully susceptible.