What's eating my begonia 'maurice amey'?

Begonia 'Maurice Amey', like most cane-stemmed begonias grown indoors, is most frequently troubled by mealybugs hiding in leaf axils and along stems. Whitefly and spider mites can also take hold, especially in warm, dry rooms. Early isolation of infested plants and neem oil sprays are the primary defence.

White waxy cottony masses at stem joints and on leaf undersides; honeydew residue and sooty mould Alcohol-dipped cotton swabs for spot treatment; follow with systemic neem oil drench or insecticidal soap spray weekly

Clouds of tiny white flies when plant is disturbed; yellowing leaves; sticky honeydew Yellow sticky traps to monitor; spray undersides of leaves with insecticidal soap every 4–5 days; remove heavily infested lower leaves

Fine webs and pale stippling on leaf surfaces, worsened by low humidity Increase ambient humidity; wash foliage with water; apply neem oil or insecticidal soap and repeat after 7 days