What's eating my begonia 'palomar prince'?

Begonia 'Palomar Prince' is a rhizomatous begonia most vulnerable to mealybugs nesting in the rhizome crowns and leaf bases. Botrytis grey mould can damage leaves and stems if humidity is high without airflow. Spider mites are a secondary threat in dry rooms. Inspect rhizomes when repotting and ensure good ventilation.

White cottony masses at rhizome crowns, leaf bases and stem joints; weakened, discoloured growth Alcohol swab treatment at rhizome and leaf-base level; neem oil drench and spray; repeat weekly until clear

Stippled pale patches on leaf surfaces; webbing on undersides; leaves may bronze and drop Improve humidity; wash leaves; apply neem oil or miticide and repeat after 7 days

Soft-bodied insects on fresh growing tips; sticky honeydew; curled new leaves Knock off with water spray; treat with insecticidal soap; check new growth weekly during active growth season