My viburnum bushes appear to be dying or are infected. The leaves are turning red/brown, falling off and dying, and branches are weak at base of plant, falling off as well. I was told it might be infected with a borer. What is a viburnum borer? Could this be responsible? How can I get rid of it? Will cutting off the infected branches help? I have sprayed with an insecticide containing permethrin. Will that help?
Why Are the Leaves on My Virburnums Turning Red?
Certified GKH Gardening Expert
The leaves are turning red due to something killing it and it could well be a borer issue. Here are more information about them and their control:
It may also be a fungus, which can be treated with a fungicide.