What’s Wrong With Our Eucalyptus Tree

Question

We have 6+ huge eucalyptus trees in our backyard. One just dropped a big branch. The center of the branch is very alarming. See pics attached. The center is dry. Are they dying?

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Answer 1

This is a heart rot. Likely, there will be no cure, as it has already colonized the inside of the tree. Eventually, it will cause the death of them, but this can take years.

Many fungi cause white heart rot. This article will help:

https://www.gardeningknowhow.com/ornamental/trees/tgen/heart-rot-in-trees.htm