Ulmus Parvifolia - Pests and Diseases

Pests and Diseases

The Chinese Elm is highly resistant, but not immune, to Dutch elm disease. It is also very resistant to the elm leaf beetle Xanthogaleruca luteola, but has a moderate susceptibility to Elm Yellows. In trials at the Sunshine Nursery, Oklahoma, the species was adjudged as having the best pest resistance of about 200 taxa However, foliage was regarded as only "somewhat resistant" to black spot by the Plant Diagnostic Clinic of the University of Missouri .

Cottony cushion scale or mealy bugs often protected and "herded" by ants exude a sticky, sweet "honeydew" which can mildew leaves and be a minor annoyance by dripping on cars and furniture. But severe infestations or obvious damage on otherwise healthy trees are not common.