Viburnum Tinus Purpureum - brown leaves
We have 4 Viburnum Tinus plants and they have all been infected with the same disease - see pic above. The leaves turn brown and eventually fall off. The plants are all quite large and in a reasonably sunny spot. We've tried spraying them with fungus fighter but that didn't seem to help.
Should we just cut the plants right back and hope that new growth is not infected? Any suggestions welcome!