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 ...

In what is now southeastern Canada and northeastern US, the American elm ... the way in which whole elm-lined streets became denuded in a matter of a few years. A few trees show a degree of ...

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 ...

Ryan Murphy and Ben Held, co-investigators on the U’s disease-resistant elm selection and reintroduction program, want to ...

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 ...

Slippery elm is one of the smallest native North American elms but with one of the largest leaves. The tree never grows in pure stands. The tree has a slimy (slippery) inner bark, tastes like ...

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.