Elm hybrids more resistant than American elms

Elm hybrids more resistant than American elms: "t may be time to consider planting the new disease-resistant elm hybrids, as a trial. Many years of intensive hybridizing have yielded several likely substitutes for the American elm. Unfortunately, none of them is perfect. The vase-shaped form of the classic American elm is elusive, but good progress is being made with resistance to Dutch elm disease, elm yellows (another disease) and feeding by elm leaf beetles."