To help your viburnum with the damaged bark I would just take wait and see and “tender loving care” approach.
TLC means just watching your precipitation and make sure the viburnum is not stressed and get enough water but no wet feet with permanently wet soil.
You need about 1 inch of water per week:10sq.ft ~ 6.23 gallons - applied very slowly so it could reach deep
Not sure about the fertilizer - it is between none and very light sprinkling - but away from the trunk. You know your soil/conditions better.
Do not fertilize after the end of June
As the bark is damaged- I would watch for canker disease - especially conducive to occur in drought conditions- hence regular watering schedule in the absence of rain.
Prune off affected branches, sterilize pruners with alcohol
https://hgic.clemson.edu/factsheet/v...-insect-pests/
I want you to note how amazing the nature is: even extensive bark damage by the culprit isn’t absolute as in girdled - girdled plant will die.
Yours have enough bark left for the viburnum to repair itself and close out the wounds.
I wouldn’t put anything on it.
The damage may never happen again or for a while
Nature has a tendency to kill off the weak by sending pests and diseases, winds, etc
My concern would be especially if it is a relatively recently planted tree - could it be anything wrong with the growing conditions?
-is it planted too deep? Search “root flare”
-was it planted with pot bound roots circling each other and strangling itself?
-is it too wet from irrigation, etc?
-is it mulched and the mulch is too deep - more than 2 inches? The plant can’t “breathe” - the roots need gas exchange
is the mulch, if any, too close to the trunk? Need 4-6 inch of bare soil around the trunk.
If you notice completely dead branches - prune them off - as well as crossing and competing branches -it would stimulate a new fresh growth helping the tree to recover
Not quite sure, but it looks like it is potentially could be a leather leaf viburnum or some hybrid based on its parentage: Viburnum rhytidophylloides or one of its crosses
Please, be careful if this is the case when pruning. Something to be aware
https://chatsworthlady.com/2015/07/1...ller-viburnum/
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