How to prevent tea white peony disease

Cloth and Symptoms: The disease is a common nursery root disease. Wide range of distribution, serious damage. In addition to tea, there are still more than 200 species of plants such as melons, Solanaceae, hemp, tobacco, and peanuts. Occurred in the root and neck, the disease was a brown spot at the beginning, the surface of white cotton wool-like material, expanded around the neck after a round, shape or white lenticular fibroids, can be extended to the soil surface. The rapeseed sclerotia formed in the diseased part later, from white to yellow-brown to dark brown. Due to the pathogenic effect of pathogens, the cortex of the diseased plants was rotted, transportation of moisture and nutrients was hindered, and the leaves withered and shed brand furniture. Finally, the whole plant died.

Pathogen: A basidiomycete subphylum fungal strain. The mycelia were initially colorless, followed by brownish, dense, sclerotia. Sclerotia round, smooth surface, hard, dark brown. Propagation bodies, namely basal and basidiospores, are produced under humid and hot conditions, but they are not common and have little effect on disease transmission.

Occurrence pattern: The sclerotia is mainly wintered in the soil or attached to the diseased tissue and can survive for 5 to 6 years under dry conditions. At the turn of spring and summer of the second year, hyphae will germinate when the temperature and humidity are suitable, spread along the soil gap or spread with rainwater, irrigation water, agricultural implements, etc., injuring the roots and necks of the seedlings. High-temperature and high-humidity are conducive to the onset of disease, with the highest incidence from June to August. The soil is heavy, the acid is too large, the terrain is low, the tea grows poorly, and before it is a parasitic disease, the disease is also heavy.

Control methods: Select nursery for raw or non-infested crops. Pay attention to the drainage of tea gardens, improve the soil, promote the construction of seedlings, and enhance the resistance to disease. Infected nursery should remove diseased seedlings and disinfect soil in time. The agent used 50% carbendazim 500 times, 0.5% copper sulfate or 70% thiophanate 500 times. Transplanting tea leaves can be sterilized with 20% lime water.

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