Sorbus torminalis · Tree
Fireblight: Prune out infected wood well below the visible symptoms during dry weather, disinfecting tools between cuts.
Apple canker: Cut out cankers with a sharp knife down to healthy wood and apply wound paint to prevent reinfection.
Honey fungus: Improve drainage and avoid soil compaction; severe cases may require removal of the tree to prevent spread.
Silver leaf: Prune out infected branches and avoid wounding the bark, as the fungus enters through injuries.
Aphids: Encourage natural predators like ladybirds or use a strong jet of water to dislodge them.