Certified GKH Gardening Expert
The condition is possibly "Phytophthora gummosis" a fungus-like disease organism that causes the exuations. See the 'management' section in this UC article.
There is one fungicide that I know of that is labeled for phytophthora disease, Subdue Maxx or the generic equivalent:
It only takes a quarter ounce per gallon of water for a soil drench solution. But the minimum purchase is a quart, so it's kind of expensive.