How gross is this?? This is an infection called slime flux and it WILL kill your tree very quickly, not necessarily by the infection, but by all the insects it attracts. Slime flux is an oozing infection and it gives off a vinegar and rotting fruit smell and that is just about as loud of a dinner bell as you can get for roaches, hornets, flies, borers, caterpillars, beetles, and larvae to come feast. We can save the tree before it is taken over by insects and give it the nutrition it needs to fight this in the future.