The following was received via email: My home on Salt Spring Island is home to many arbutus trees. There is a disease afflicting some of them, turning the branches black. It seems to be spreading although there are several trees still unaffected. The black limb is associated with gradual loss of foliage and other signs of disease. Can you tell me about this disease (which seems to be widespread on the island), and what is the best way to prevent/slow/minimize the disease both for stricken and still healthy trees. Thanks, Irving
