ケヤキ
The threats to this tree include colder temperature, which often result in twig dieback. It is highly resistant to Dutch elm disease, which makes it a good replacement tree for American elm. "Zelkova serrata" is similar in appearance to the elms, though may be distinguished by its unwinged fruit and leaves which are symmetrical rather than uneven at their base. "Zelkova serrata" also shows good resistance to elm leaf beetle and Japanese beetle.