Symptom Identification and Control Methods of Green Calyx Disease in Chrysanthemum Cultivation

Green calyx disease is a rather unusual disease in chrysanthemum cultivation, generally believed to be caused by phytoplasma infection. After infection, the most obvious feature is abnormal floral organs: the petals fade to green, become narrower and thinner, and resemble leaves, losing their original flower color and ornamental value. Some diseased plants also show slender, weak branches, smaller flowers, and stunted growth.

The pathogen is mainly spread by piercing-sucking pests such as leafhoppers, and can also spread with diseased cuttings, divided seedlings, or grafting material. Once diseased plants appear in the field and are not dealt with promptly, the risk of healthy plants becoming infected rises noticeably. In seasons with higher temperatures and active pests, the disease often spreads faster.

Controlling green calyx disease should focus on prevention. When collecting cuttings, choose healthy mother plants, and never take cuttings or divide seedlings from diseased plants. Diseased plants should be pulled out promptly and taken out of the field for destruction to prevent them from becoming a source of infection. At the same time, manage pest control well: spray pesticide promptly during outbreaks of disease-transmitting pests such as leafhoppers to cut off the chain of transmission. When symptoms first appear, you can also consult your local agricultural technology department and use antibiotic-type agents as an auxiliary treatment as appropriate.

For routine care, keep the growing environment well ventilated and well lit, plant at a reasonable density, and avoid overcrowding that invites pests and diseases. When propagating new seedlings, give priority to virus-free seedlings or tested, robust planting material to reduce disease from the source. With consistent, standardized management and early prevention and treatment, chrysanthemums can produce full, vivid blooms.