Viburnum × carlcephalum · Shrub
Viburnum beetle: Hand-pick adults and larvae; prune out infested shoots or apply systemic insecticides if severe.
Aphids: Spray with water jet or use insecticidal soap; encourage natural predators like ladybirds.
Powdery mildew: Improve air circulation and avoid overhead watering; treat with sulphur-based fungicide if necessary.
Phytophthora root rot: Ensure well-drained soil; avoid planting in heavy clay or areas prone to waterlogging.
Honey fungus: Improve drainage and remove infected roots; avoid replanting viburnums in the same spot.