Hello, Have any of you fruit tree growers encountered this condition? This "blistering" of clear sap on the base of the trunks is occurring on otherwise healthy young cherry trees. This particular one is a multi-graft (bing, rainier and stella) and fruited well this year. It appears to be healthy and the only other unusual thing that I have experienced with these trees was a very heavy infestation of tent caterpillars a couple of months ago that required (or at least it did in my opinion) some out of season pruning. Other than that, the only problems I have had are some minor leaf curl. The trees are mulched with composted steer manure and watered fairly regularly. Any ideas as what this is and how serious it is would be much appreciated. Thanks! p.s. I have had some evidence of bacterial canker on some old flowering scrub cherries elsewhere on the property.