Above: An elm-lined street in St. Paul, MN, before most of the trees were killed by Dutch Elm Disease. Although the American elm persists in forests and pockets of cities and towns, Dutch Elm Disease ...
That means prevention is key. “If you need to have an oak pruned to remove damaged branches or improve its structure, have it done in winter,” Yiesla said. Elms, too, should be pruned only in winter, ...
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