Canna 'Bengal Tiger' problems — and how to fix them

Caterpillars of the Brazilian skipper roll and feed within young leaves, leaving ragged holes. Remove by hand or apply Bt spray early in the caterpillar stage.

Common in dry, hot conditions. Dull, stippled foliage and fine webbing are tell-tale signs. Treat with neem oil or insecticidal soap and raise humidity.

Fuzzy grey mould develops on rhizomes stored in cold, damp conditions. Improve ventilation, reduce moisture, and treat affected areas with a fungicide dust.

Orange pustules on leaf undersides, especially in warm, wet summers. Remove infected leaves and avoid wetting foliage.

Irregular yellow streaking on leaves; spread by aphids. Control aphid populations and remove affected plants.