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My plum tree has something
My plum tree has something that looks like sap coming out of some of the branches. I'm not sure if it got froze and slit and that is why it is oozing sap. In 2012 it really produced a lot of fruit but not in 2013. Well, it did produce but all the plums fell off while very small and green. It is doing the same thing this year so far and that is when I noticed the sap coming out. Any suggestions on what to do now??