Euphorbia peplus · Annual
Photo: Krzysztof Ziarnek, Kenraiz · CC BY-SA 4.0 · cropped from original
Powdery mildew: Improve air circulation and water at the base; apply a fungicide if severe.
Slugs and snails: Use physical barriers, iron phosphate pellets, or hand-pick at night.
Root rot: Ensure well-drained soil and avoid overwatering; remove affected plants.
Vine weevil: Apply nematodes to the soil in autumn or use systemic insecticides.