Grapefruit tree bleeding. Why?

Question

Mature tree. Good fruit and leaves. Small splits on trunk area are oozing pitch. It’s dry, not sticky. May be from summer or spring. Does this likely need treatment?

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Answer 1

The condition is possibly "Phytophthora gummosis" a fungus-like disease organism that causes the exuations. See the 'management' section in this UC article.
http://ipm.ucanr.edu/PMG/r107100411.html

There is one fungicide that I know of that is labeled for phytophthora disease, Subdue Maxx or the generic equivalent:
https://www.domyown.com/mefenoxam-aq-fungicide-p-16650.html

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.