The American ElmcultivarUlmus americana 'Patmore' was selected and raised by R. H. Patmore from a native tree in Brandon, Manitoba, Canada. It may be synonymous with another cultivar from the same source, known as 'Brandon'.[1]
Description
'Patmore' (or 'Brandon') differs from most American Elms in possessing a pyramidal, as opposed to vase, form.[2]
Pests and diseases
No other specific information available, but the species generally is highly susceptible to Dutch elm disease and Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola,[3] and highly preferred for feeding by the Japanese Beetle Popillia japonica[4][5] in the United States.
U. americana is also the most susceptible of all the elms to verticillium wilt.[6][7]
Cultivation
The tree is not known to have been cultivated beyond North America.