Ulmus parvifolia 'Yatsubusa'
The Chinese Elm cultivar Ulmus parvifolia 'Yatsubusa' is a dwarf variety. Description. The name is used both to identify a cultivar and as a group name for particularly small-leaved variants specifically raised for bonsai culture . Pests and diseases. The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle "Xanthogaleruca luteola". Etymology. 'Yatsubusa' is the Japanese word for 'dwarf'.