Rhododendron campylogynum · Shrub
Vine weevil: Apply biological nematodes in autumn or use systemic insecticides for severe infestations.
Powdery mildew: Improve air circulation and apply a fungicide if infection is heavy; avoid overhead watering.
Rhododendron bud blight: Remove affected buds and apply a copper-based fungicide in late winter before bud swell.
Pieris lacebug: Encourage natural predators like ladybirds or use a horticultural oil spray in spring.
Root rot (Phytophthora): Ensure excellent drainage and avoid waterlogging; remove severely affected plants.