Arbutus unedo · Tree
Elsinoë leaf spot: Remove and destroy affected leaves and fallen debris to reduce fungal spores.
Ruptoseptoria leaf spot: Improve air circulation and remove infected material; avoid wetting foliage when watering.
Scale insects: Scrape off heavy infestations manually or use horticultural oil during dormancy.
Aphids: Encourage natural predators like ladybirds or blast off with a strong jet of water.
Frost damage: Plant in a sheltered, south-facing position and protect young plants in winter.