I have a 15 year old arbutus tree at the edge of my veg. garden that has developed the black leaf spots on the lower leaves for several years now but seems to recover each summer and is growing well. I have native kinikinik as ground cover in several areas of the garden and now the areas near the arbutus are showing black leaves also. Is this the same disease ?
More than a dozen fungal organisms can cause leaf spots and dead regions on madrone leaves, and the specific disease can be difficult to identify Madrone (Arbutus menziesii)-Leaf Spots and Blights Several fungi have been associated with leaf spots of Arctostaphylos uva-ursi Kinnikinnick (Arctostaphylos uva-ursi)-Leaf Spot