I am sorry for this delayed reply to your gardening question. We are transitioning to a new Q&A system and your question was unfortunately lost in the transition. I have discovered it now and hope this reply is not too late to be of help.
The weeping is due to insects (such as plant hopper and aphids) in the tree that are feeding on the tree's juices and then excreting the excess out their back ends! This is not big problem for the tree and many trees have such minor pests. However it is a problem if you like to sit beneath the tree with an open glass of iced tea!
Thanks for the question. Please stop in again soon!
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