Dipsacus fullonum · Biennial
Aphids: Squash by hand, blast off with water, or apply a plant-based insecticide if infestations are severe.
Slugs and snails: Use beer traps, copper tape barriers, or iron phosphate-based pellets to protect seedlings.
Stem rot: Ensure well-drained soil and avoid overwatering; remove affected plants to prevent spread.
Powdery mildew: Improve air circulation and spray with a bicarbonate of soda solution or approved fungicide.
Vine weevil: Apply nematodes to the soil in autumn or use systemic insecticides for severe infestations.