What's eating my begonia carolineifolia?

Begonia carolineifolia, a distinctive rhizomatous species with palm-like compound leaves, is susceptible to mealybugs in its rhizome crevices and at leaf bases, and to spider mites in dry air. Fungus gnats can colonise the moist, leafy soil this species prefers. Inspect the rhizome surface closely — mealybugs hide beneath it effectively.

Cottony wax along rhizome surfaces and at petiole bases; slow decline and yellowing of leaves Apply isopropyl alcohol directly to colonies; drench soil with neem oil solution; repeat every 7 days

Fine pale stippling on the large compound leaflets; webbing on undersides in heated rooms Rinse leaflets; spray with insecticidal soap or neem oil every 5–7 days; increase humidity

Larvae in moist peaty soil damage surface roots; adults swarm around the soil Allow soil surface to dry between waterings; apply Bti (Bacillus thuringiensis israelensis) drench; use yellow sticky traps