Primula vulgaris · Perennial
Primula rust: Remove and destroy infected leaves immediately to prevent spread; avoid using fungicides to protect biodiversity.
Slugs and snails: Use physical barriers like copper tape or crushed eggshells, and hand-pick pests at night.
Vine weevil: Apply biological nematodes (Steinernema carpocapsae) to the soil in late summer or autumn.
Aphids: Encourage natural predators like ladybirds or blast off with a strong jet of water.
Powdery mildew: Improve air circulation around plants and avoid overhead watering to keep foliage dry.