Insect resistance ratings for elm species, hybrids, and cultivars evaluated in the National Elm Trial, Lexington, Kentucky, U.S., 2006–2012.
| Major pests | Leafminers | Gall aphids | Leaf curl aphids | Other | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Species/parentage | Cultivar name | JB | FW | FL | ES | Ku | Aa | PG | CG | WE | WA | CM | Oh | Overall scorez | Rank |
| U. americana | Valley Forge | 2 | 2 | 5 | 5 | 0 | 5 | 1 | 2 | 3 | 1 | 3 | 5 | 48 | 20 |
| Princeton | 3 | 2 | 4 | 4 | 0 | 4 | 1 | 1 | 5 | 5 | 3 | 2 | 47 | 19 | |
| Jefferson | 2 | 0 | 3 | 2 | 0 | 2 | 0 | 4 | 2 | 4 | 1 | 2 | 29 | 10 | |
| New Harmony | 1 | 2 | 5 | 5 | 0 | 3 | 0 | 0 | 1 | 1 | 2 | 2 | 35 | 16 | |
| Prairie Expedition | 3 | 3 | 3 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 2 | 3 | 32 | 15 | |
| U. parvifolia | Emer II Allee | 0 | 4 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 2 | 13 | 4 |
| Athena C. Lacebk | 0 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 11 | 1.5 | |
| Everclear Lacebark | 0 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 11 | 1.5 | |
| U. propinqua | Emerald Sunshine | 1 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 12 | 3 |
| U. wilsoniana | Prospector | 3 | 4 | 2 | 2 | 0 | 3 | 1 | 0 | 0 | 0 | 0 | 2 | 28 | 9 |
| Hybrids | Morton P.V. | 5 | 4 | 1 | 0 | 3 | 1 | 3 | 0 | 0 | 0 | 0 | 3 | 30 | 11 |
| New Horizon | 2 | 5 | 3 | 3 | 5 | 2 | 5 | 0 | 0 | 0 | 1 | 3 | 41 | 18 | |
| Morton R.T.D.C. | 4 | 4 | 1 | 2 | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 5 | 31 | 13.5 | |
| Morton Accolade | 5 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 3 | 20 | 5 | |
| Morton G.T. | 4 | 2 | 1 | 1 | 0 | 0 | 3 | 0 | 0 | 0 | 1 | 2 | 20 | 6.5 | |
| Morton S.C. | 4 | 3 | 1 | 0 | 3 | 0 | 2 | 0 | 0 | 0 | 0 | 4 | 25 | 8 | |
| Patriot | 4 | 3 | 3 | 5 | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 4 | 38 | 17 | |
| Frontier | 2 | 4 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 20 | 6.5 | |
| Homestead | 5 | 5 | 1 | 0 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 4 | 31 | 13.5 | |
| Pioneer | 5 | 4 | 1 | 1 | 3 | 1 | 2 | 0 | 0 | 0 | 0 | 2 | 30 | 12 | |
↵zOverall score = (2 × scores for major pests) + (sum of scores for remaining pests).
NOTE: Pest abbreviations: JB, Japanese beetle; FW, European elm flea weevil; FL, European fruit lecanium; ES, European elm scale; Fu, Kaliofenusa ulmi; Aa, Agromyza aristata; PG, pouch gall; CG, cockscomb gall; WE, woolly elm aphid; WA, woolly apple aphid; CM, cottony maple scale; Oh, Oedophrys hilleri. Sources: Condra et al. 2010 and this paper.