Watch out for

Powdery mildew: Improve air circulation and apply a suitable fungicide if infection is severe.

Bacterial leaf spot and canker: Prune out infected branches in dry weather and avoid wetting foliage when watering.

Honey fungus: Remove infected plants and roots completely; resistant varieties are recommended for replanting.

Slugs and snails: Use physical barriers like copper tape or apply iron phosphate-based pellets.

Pocket plum: Remove affected fruits promptly to reduce spore spread and improve site drainage.