I don't know how or why this is happening, but we have a huge (I think) pin oak in our front yard. It's an old tree and I want to save it at all costs, but I feel like something is wrong with it. It has some dead spots in the limbs throughout and is being swarmed with what I believe are hornets, moths and butterflies. The picture doesn't show it well, but it looks like there's something dark running down the trunk. Does anybody have any insight to what this might be? Any help is GREATLY appreciated. I really just want this remedied to keep my two young boys (4 and 2) out of immediate danger.