MySheen

The blight of lily

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Symptoms: the disease often occurs on the tender leaves of the plant, and stems and flowers can also be damaged. At the initial stage of the disease, oil-stained spots appeared on the susceptible leaves, and then gradually expanded into grayish green. When the disease was serious, the leaves and flowers were soft rot. Near the ground of the susceptible stem, the diseased part was water-stained, browned, wrinkled, the plant wilted, lodged and died. The bulb was infected when it sprouted and only the top of the young stem withered. When wet, the disease produces a white mildew layer. Pathogen: the pathogen is Phytophthoracactorum (Leb.et)

Symptoms: the disease often occurs on the tender leaves of the plant, and stems and flowers can also be damaged. At the initial stage of the disease, oil-stained spots appeared on the susceptible leaves, and then gradually expanded into grayish green. When the disease was serious, the leaves and flowers were soft rot. Near the ground of the susceptible stem, the diseased part was water-stained, browned, wrinkled, the plant wilted, lodged and died. The bulb was infected when it sprouted and only the top of the young stem withered. When wet, the disease produces a white mildew layer.

The pathogen is Phytophthoracactorum (Leb.etCohn) Schrot. And parasitic Phytophthora (P.parasiticaDast.), all belong to flagellum subphylum, oomycetes, downy mildew, Phytophthora fungi.

Incidence regularity: the two kinds of Phytophthora mainly overwintered as oospores on the diseased remains in the soil. When the conditions were suitable in the next year, the oospore germinated and produced germ tube to invade the plant, and then sporangia and sporangia were produced on the plant for re-infection. Under rainy, poor drainage, low-lying and humid conditions, the disease is serious.

Prevention and treatment: ① reduces the source of infection: pull out the diseased plant and burn it centrally. ② strengthens cultivation management: the soil can be irrigated with dimethazone in a large area of production, and pots can be filled with disinfectant soil. The planting land requires good drainage, and the flat land can be cultivated as a high border. Avoid damaging the stem base when gardening. ③ chemical control: plant growth period, can be sprayed with Bordeaux liquid and other chemicals.

 
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