Anthracnose of Lily

Lily anthracnose harms the leaves, stems and flowers of the plant, causing leaves to fall early, seriously affecting the growth and development of the plant and reducing its ornamental value.

Symptoms: in the early stage of the disease, there is an oval spot on the susceptible leaf, the center of the spot is light yellow, the edge is purplish brown or dark brown, and the center of the spot is slightly sunken. The petals are light brown and thin. The diseased pedicel turned black. Susceptible bulbs generally occur on the outer scales and sometimes on the inner scales. At the initial stage of the disease, light brown and irregular spots appeared on the scales, and then the disease spots expanded and sunken, from brown to black, and the scales were dry rot and wrinkled. In the later stage of the disease, small black spots were produced in the soil of the disease, which was the conidia disk of the pathogen.

Pathogen: the pathogen is ColletotrichumliliiPlakidas, which belongs to the subphylum Cellulospora, Coleophora, Coleoptera, Coleoptera and Cephalosporium.

The regularity of the disease: the pathogen overwintered on the remnant with mycelium and conidia. The conidia were produced when the conditions were suitable in the next year, and the conidia were transmitted by wind and rain to infect the plant. High temperature and high humidity are beneficial to the occurrence of the disease.

Prevention and treatment: ① reduces the source of infection: when diseased plants are found, they are cut off or removed in time and destroyed centrally. ② to strengthen cultivation management: do not overwater the bulb and make the bulb frozen. If there are conditions, use disease-free soil to plant. Pot growers use sterilized soil to install pots. Strict selection of disease-free bulbs, before planting, soak the bulbs with benzoate, have a certain control effect.