The trees have been killed by Dutch elm disease. Arborist Jerry Auble holds the bark of a diseased American elm tree, pointing to the small holes caused by tiny European elm bark beetles exiting ...

This is different from the dark brown and reddish-brown layers found in the bark of red elm or slippery elm. The American elm features an open, spreading crown and drooping limbs that form a vase ...

It’s a sunny September day in Castine, Maine, and I’m standing in a stranger’s yard debating how best to hug a tree. Not just any tree, but an American ... elm disease in a tree there. The ...

However, almost all mature American elm trees have been killed in the last 50 years by Dutch elm disease, which is caused by a fungus, Ophiostoma novo-ulmi, introduced from Asia. Elm bark beetles ...

The Denver forestry office discovered the disease last month in the old American ... for bark beetles, as are other stressed trees. A female beetle finds a weak spot on the top of an elm and ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. Willows (Salix ssp) can be identified by their long, narrow leaves ...

One of the most destructive tree diseases is back in Denver. Dutch elm disease ... massive American elms are at risk of a deadly disease spread within their roots and by pesky bark beetles.

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 ... by brown streaks in the outer sapwood after the ...