| Ulmus hybrid | |
|---|---|
| Details | |
| Hybrid parentage | Ulmus 'Morton' Accolade open pollination |
| Cultivar | 'Morton Red Tip' = Danada Charm™ |
| Origin | USA |
The hybrid cultivar 'Morton Red Tip' (Danada Charm) is another Morton Arboretum selection, derived from an open pollination of the 'Morton' Accolade hybrid cultivar. The tree has occasionally been reported as a result of the hybridization of Accolade with the Siberian Elm Ulmus pumila,[1] an error probably owing to the use of U. pumila as rootstock.
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The tree has a graceful, vase-shaped habit resembling the American Elm Ulmus americana with foliage tinged red on emergence.
Although highly resistant to Dutch elm disease, 'Morton Red Tip' (Danada Charm) is very susceptible to the elm leaf beetle Xanthogaleruca luteola [2][1], Japanese Beetle,[3] and Gypsy moth; it is also moderately preferred by cankerworms.[4][5]
'Red Tip' is very cold hardy; in artificial freezing tests at the arboretum [6] the LT50 (temp. at which 50% of tissues die) was found to be - 31 °C. However, the tree is notorious for its stem breakage owing to narrow crotch angles and included bark; in trials at the University of Minnesota it had the unhappy distinction of being the worst of 17 cultivars for breakage.[7] The tree is currently being evaluated in the National Elm Trial coordinated by Colorado State University.
'Morton Red Tip' (Danada Charm) is being promoted by the Chicagoland Grows corporation, but is not widely available in the USA. It is not known (2008) to have been introduced to Europe or Australasia.
Danada Charm is named for the Daniel F. & Ada L. Rice Foundation which helped sponsor the elm breeding programme at the Morton Arboretum.