Following the devastation of Elm Disease we now have Ash Disease, commonly known as ash dieback, or Chalara, which is a disease of ash trees caused by a fungus called Hymenoscyphus fraxineus. Chalara causes leaf loss, crown dieback and bark lacerations and once a tree is infected it very often means it will succumb to an unhappy end. Experts believe not all trees will die of the infection - some are likely to have genetic factors which give them tolerance of, or resistance to the disease. Scientists are working hard to learn from existing and emerging research and practical experience in combating the disease.