Fruit trees

Question

My fruit trees, (i.e. plum, lychee, mulberry, etc.) have a mottled look on the bark, and some of the bark is splitting.

Answer 1

Most likely the bark splitting is due to environmental changes, such as temperature fluctuations.
Generally the tree recovers unless the tree is girdled.

https://www.gardeningknowhow.com/ornamental/trees/tgen/cracking-tree-trunks.htm

https://www.gardeningknowhow.com/ornamental/trees/tgen/painting-tree-trunks-white.htm