Prevention and control of 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.
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Control of lily anthracnose
Symptom: Leaves have round yellowish spots, and the edges of the spots are dark brown. The spots on the petals are round and flaxen. It mainly occurs on the outer surface of the upper part of the scale, but also occurs on the inner surface. It produces irregular, light brown spots in the early stage, then light black brown, slightly depressed, and finally almost black in the diseased part. The tissue shrinks and dries, and the diseased spots can be as deep as several layers of scales, but the outermost scales are the most severely damaged. The flower buds of the diseased bulbs are aborted, brown to black, or a large number of small water-like spots appear on the flowers, which merge into irregular brown spots.
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Anthracnose of lily (colletatrichuan liliaecearwn ferr.
It mainly harms bulbs and also infects leaves and flowers. After the bulb was infected, irregular and light brown spots appeared at the initial stage, then light dark brown, slightly sunken, and finally the disease spot was almost black, and the tissue contracted and dried. The outer bulb suffered the most and gradually extended to the inner layer. The leaves were damaged, resulting in oval, yellowish disease spots, black-brown edges, and slightly sunken. Colletotrichum gloeosporioides overwintered in the affected area with hyphae and produced conidia the following year, which were spread by wind and rain. A plot with heavy clay and high water content; a plot with many lily mites.
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