Sounds like a case of slime flux to me. Slime flux is a soil bacteria, common everywhere. It can infect or grow in any tree that has been wounded somehow from pruning cuts, wind damage, weedeater scrapes, etc. Most of the stuff I've read indicates it really does'nt hurt the tree in & of itself, except in the weird condition where the foam builds up pressure inside a limb, etc & kinda blows up/breaks the limb. It feeds off the sugars available in the tree. I can't help but believe it opens the door for other infections though & sure would seem to keep a wound from healing properly. There is no cure for it, the best you can do is wash the affected area down regularly to remove the ooze, which stinks, and upon which the other bugs you're seeing feed on. I've known people to try putting bleach in a hose-end sprayer to combat it...can't say it does'nt work to reduce the growth of the bacteria, but who knows how bad spraying a bleach/water solution on your tree is either? Prevention is the recommended key by avoiding wounds & pruning when bacteria are dormant, aka, winter.