Rhododendron niveum · Shrub
Vine weevil: Apply nematodes to soil in autumn or use systemic insecticides for severe infestations.
Powdery mildew: Improve air circulation and apply a fungicide if infection is heavy.
Rhododendron bud blast: Remove affected buds and avoid wetting foliage when watering.
Pieris lacebug: Spray with a suitable insecticide in spring when nymphs are active.
Rhododendron petal blight: Remove fallen flowers to reduce spore load and ensure good drainage.