Leaves – simple, deciduous, alternate, about 5″, coarsely doubly serrate, usually scabrous above, and often pubescent below with an inequilateral base. Twigs – slender and zigzag. Buds – 1/4″, acute, ...

Dutch elm disease is a fungal infection spread by tiny bark beetles that can rapidly wither and kill healthy trees. A new strain ... genes from an Asian species. Professor Richard Buggs, senior ...