We have lived in home for 30 years. 100 + year old white oak tree is leaking sap all over deck, deck furniture, grill, deck hand rail. This has been going on since end of May. We have not had a problem in the past 30 years. The leafs are coated with a sticky like syrup. You can power wash on Saturday and the deck,etc is covered by Sunday. Why haven't we had a problem in the past and what is different this year. Back in May we had some bug stripping the leaves back to a skeleton like with just the stim and viens of the leaf left on the lower part of the white oaks, shingle oaks, and pin oaks, etc. Could this be natures way to heal the damage to the leaves.