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Grapefruit Trees

Q.Grapefruit tree bleeding. Why?

Zone 92234 | Brandall@shaw.ca added on November 5, 2018 | Answered

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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Answered on November 7, 2018

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.

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