About two months ago a substantial bough fell off our ornamental cherry tree, which is certainly 20+ years old. This increased the asymmery of the tree, leaving most of the large boughs confined to the west, downslope, side. At about the same time, the tree began to "bleed" from several points in the main trunk, about 2.5 m high, and one point close to the base of the largest south-facing branch. The "blood" looks like resin, and congeals in stalactites hanging from the bark. Is this a sign of ill health? Or is it an indication that the stresses induced by the asymmetrical branch load on the main trunk are splitting the trunk open. I should add that I have severely pruned the largest of the west-facing boughs in order to re-establish a degree of greater branch load symmetry.