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Jul 11, 2015 at 20:40 comment added stormy Or old age...make sure there are no constrictions such as tags, wire...that might compromise the vascular system of this tree. CUT them off. Make sure this wire fence is not touching the bark. Make sure that the line between roots and bark is respected...soil, mulch CAN NOT get up on the bark above the line where roots end!!!
Jul 10, 2015 at 1:34 vote accept Parker
Jul 10, 2015 at 1:13 comment added Parker Thank you, that explains why I was having a difficult time finding it in the disease lists. The second link you provided was especially useful, the take-home message being that the presence of lichen is a good sign because it is an indicator of a healthy environment.
Jul 10, 2015 at 1:06 history answered J. Musser CC BY-SA 3.0