Cast-Iron Plant (Aspidistra elatior) is one of those plants that you don't expect to have any problems. It can grow in areas of deep shade, drought and poor soils, filling a very specific niche in the garden.
Over the last couple of years, I have seen an increase of scale on this species- both in nurseries and landscapes. And it seems to reproduce and establish quickly. This brown insect covers the leaves like braille and is easily detected.
Don't use Horticultural Oil on Cast-Iron plant because it can be absorbed by the leaves and result in a water-soaked mottling.
The best management is to remove any leaves that have scale.
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