Pests and Diseases
'Frontier' has a good resistance to Dutch elm disease, rated 4 out of 5, and Elm Yellows. However, the tree can be heavily to severely damaged by the Elm Leaf Beetle Xanthogaleruca luteola, although it fared better than most of the cultivars assessed at U C Davis, suffering little more than 10% foliar damage. Although susceptible to attack by Japanese Beetle, it is far less seriously affected than most hybrid cultivars available in the USA.
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