Q.If my dwarf viburnum has curled brown leaves with a little bit of red…quite extensively (maybe half) should I prune the damaged
areas? It is mid Sept. with a lot of rain this year. Plant is three years old and other two are fine. Don’t see any aphids but wondered if I should apply a soapy water mixture before or if necessary after pruning.
Certified GKH Gardening Expert
Here's an article that addresses this exact situation:
It sounds like an insecticidal soap treatment is a good idea. Here's how to make it: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm