Begonia (Semperflorens Cultorum Group) · Perennial
Powdery mildew: Improve air circulation and apply a fungicide if severe; avoid wetting foliage when watering.
Slugs and snails: Use slug pellets, beer traps, or copper tape barriers to protect young plants.
Vine weevil: Apply nematodes to the soil in autumn or use systemic insecticides for potted plants.
Root rot (Phytophthora): Ensure well-drained compost and avoid overwatering; remove affected plants immediately.
Damping off: Use sterile, peat-free compost and ensure good ventilation for seed trays.