Leaves are probably the most common feature used to identify trees. But in winter, when so many trees have dropped their ...

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 infected elm tree grows next to four other trees ... Symptoms of DED include b rown staining under the bark, curled and ...