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Symptoms and Control Methods of Lily Leaf Blight

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Lilies are native to the eastern and central regions of China. They are relatively cold-tolerant, prefer strong light, and do not tolerate shade. Insufficient light will affect growth and flowering. They do best in well-drained, organic-rich sandy loam. They have poor disease resistance and are susceptible to disease in hot, humid environments. Lily plants are upright and elegant, with large, brightly colored flowers and many varieties. They are suitable for planting in patches or clumps at the edges of lawns or in flower borders, creating a serene and harmonious effect. Lilies are also prized as potted flowers and cut flowers. Lily leaf blight, also known as lily gray mold, affects the plant's photosynthesis, hinders growth, and reduces ornamental value. When the disease occurs severely

Lilies are native to the eastern and central regions of China. They are relatively cold-tolerant, prefer strong light, and do not tolerate shade. Insufficient light will affect growth and flowering. They do best in well-drained, organic-rich sandy loam. They have poor disease resistance and are susceptible to disease in hot, humid environments. Lily plants are upright and elegant, with large, brightly colored flowers and many varieties. They are suitable for planting in patches or clumps at the edges of lawns or in flower borders, creating a serene and harmonious effect. Lilies are also prized as potted flowers and cut flowers.

Lily leaf blight, also known as lily gray mold, affects the plant's photosynthesis, hinders growth, and reduces ornamental value. When the disease occurs severely, it leads to the death of the entire plant.

Symptoms: The affected parts are mainly leaves, stems, buds, and flowers. In the early stage of the disease, chlorotic spots appear on infected leaves, which later expand into circular or oval lesions that range from light yellow to reddish-brown. Some lesions have a light gray center with purple edges. When dry, the lesions wither and turn light gray. In the late stage of the disease, the leaves die. When stems are infected, the affected parts turn brown and break. When buds and flowers are affected, they turn brown and rot. When young plants are affected, the growing point dies. In humid conditions, gray mold appears on the affected parts, which consists of the pathogen's conidiophores and conidia.

Pathogen: The pathogen is Botrytis elliptica (Berk.) Cooke, belonging to the Deuteromycota, Hyphomycetes, Moniliales, and the genus Botrytis. Sclerotia occasionally form on bulbs, but are commonly found on flowers that fall to the ground in summer.

Disease cycle: The pathogen overwinters as mycelium and sclerotia on diseased plants and plant debris. In the following spring, the overwintered mycelium and sclerotia germinate to produce conidia, which are spread to plants by wind and rain, causing primary infection. Under suitable conditions, multiple infections can occur within a single growing season, and eventually the pathogen enters its overwintering sites. In cool, rainy, dewy, and foggy humid environments, the pathogen produces large amounts of conidia. When air humidity is saturated and the temperature is 16°C, conidia germinate most rapidly; when the temperature is 10-18°C and conditions are foggy and humid, the pathogen can easily complete infection, and new conidia can form again within a few days.

Control: ① Reduce sources of infection: buds removed, flowers thinned, and diseased and old leaves picked off should be immediately gathered and deeply buried or burned. At the end of the growing season, diseased plants and all plant debris should be gathered and deeply buried or burned. ② Strengthen cultivation management: in greenhouses, ensure ventilation to reduce humidity and provide ample sunlight. ③ Chemical control: during the disease period, spray with 1:1:100 Bordeaux mixture or 50% zineb wettable powder at 800-1000 times dilution, once every 10-15 days, for 2-3 sprays.

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