Q.What’s up with my viburnum tree
My viburnum tree came into leaf after it had winter flowered, now all the leaves are falling off and they are covered in autumn coloured circles (see photo) could you tell me what’s wrong, the tree is 25ft tall so I can’t see if there are any insects…but I would hate to lose it…I hope you can help

Certified GKH Gardening Expert
It looks like your tree may have a fungus or anthracnose. I'm sending you links to two different articles that should help you deal with your viburnum leaf problem. One is from our website, and the other is from Clemson University's extension service:
https://www.gardeningknowhow.com/ornamental/shrubs/viburnum/brown-viburnum-leaves.htm
https://hgic.clemson.edu/factsheet/viburnum-diseases-insect-pests/