Sorbus folgneri · Tree
Powdery mildew: Improve air circulation and apply a systemic fungicide if severe; resistant cultivars are preferred.
Aphids: Encourage natural predators like ladybirds or use a strong jet of water to dislodge them.
Slugs and snails: Use physical barriers, copper tape, or iron phosphate-based pellets to control populations.
Vine weevil: Apply nematodes to the soil in autumn or use systemic insecticides for potted specimens.
Apple canker: Prune out infected wood well below the lesion and disinfect tools between cuts.