Chrysanthemum morifolium · Perennial
Chrysanthemum leaf miner: Remove affected leaves or crush larvae; use biological control nematodes in greenhouses.
White rust: Practice good garden hygiene and remove infected growth promptly to prevent spread.
Aphids: Check plants regularly and remove pests by hand or use targeted insecticidal soap.
Slugs and snails: Protect young plants with barriers or traps and maintain good garden hygiene.
Powdery mildew: Ensure good air circulation and avoid overhead watering to reduce humidity around foliage.