Noun
any of various hybrid ornamental European shade trees ranging from dwarf to tall
Source: WordNetBark beetles in particular carry Dutch elm disease as they move from infected breeding sites to feed on healthy elm trees, which in turn allows the Asian longhorned beetle to continue killing more elms. Source: Internet
"Like elm, which was decimated by the Dutch elm disease, there may be places with ash trees and seedlings in the understory, but they won't mature in populations large enough to fulfill their traditional economic or ecological purposes," Fei said. Source: Internet
The Liberty elm was developed by selective breeding of descendants of some trees that had not succumbed to Dutch elm, with generations chosen by how they reacted when they were injected with the fungus, resulting in what is known as a cultivar. Source: Internet
They noted that the old ones that have fought off or survived Dutch elm disease this long are particularly important to keep around. Source: Internet