Camellia japonica · Shrub
Camellia flower blight: Rake up fallen petals immediately to remove fungal spores; choose autumn-flowering cultivars to avoid infection.
Camellia leaf blight: Remove and destroy affected leaves promptly; improve air circulation and keep foliage dry.
Cushion scale: Control infestations with horticultural oil or systemic insecticides; wash away sooty mould with water.
Oedema: Ensure well-draining soil and avoid overwatering; reduce humidity if grown under glass.
Camellia gall: Pick off affected leaves before spores are released to prevent spread.