Viburnum lantana · Shrub
Viburnum beetle: Pick off adult beetles by hand or apply a systemic insecticide if infestations are severe.
Aphids: Squash colonies by hand or spray with a horticultural oil or insecticidal soap.
Phytophthora root rot: Ensure well-drained soil and avoid overwatering; remove severely affected plants.
Honey fungus: Improve drainage and air circulation; remove infected roots and soil if possible.
Grey mould (Botrytis): Remove affected material and improve air circulation around the plant.