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Viburnum bodnantense bark splitting

Hi, does anyone know why the bark is splitting? Is this a fungal disease? Many thanks.

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"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
I live in west central Scotland - not where that photo is...
One of my bodnantenses succumbed to what was probably honey fungus and that had split bark on several stems / branches.
In the sticks near Peterborough
In answer to Topbird and Liriodendron, the leaves started curling slightly and falling off about a month ago, they've now nearly all gone. I did scrape back some of the bark further up the plant and it was green but then I saw the splitting at the base this week. Strangely, she had two planted at the same time about 2m apart - the other one looks really healthy! And they've had the same treatment from the start.
All a bit strange really as to why one now looks so sickly. I was hoping someone would say "ah yes, that's ***************, caused by......" but I suppose sometimes these things just happen.
Many thanks to all.
Scrape around lower stem amd the nearby soil. Honey fungus has distinctive leathery "boot lace" growths.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
The split bark and curling, falling leaves could be indicative of HF but the most reliable 'test' is to scrape away a little bark at the base of an affected stem near to the root. If there is white mycelium under the bark and a fairly strong smell of mushrooms it's almost certainly bad news.
As @bede says it's a fungus which can be a bit random in the way it affects shrubs in a given area.
Unfortunately viburnums are particularly vulnerable to HF🙁