Symptoms are distributed in various tea production areas in the country, mainly affecting the base of the stems of tea plants. The basal part of the tea stems produce purple-brown spots or striae at the onset of the disease. It then turns brown, with a white pupa body, gradually emerging from the stem base to the soil surface. Expanded, the disease department later formed rapeseed-sized sclerotia, and the sclerotia were white and later turned yellowish brown or brown. The disease caused soft rot of the tea seedlings, yellowing of the leaves above the ground, and dryness or death of the whole plant.
The pathogen Sclerotiμm rolfsii Sacc. is called Sclerotinia sclerotiorum. It belongs to the fungus Aspergillus subfamily. It has the sexual state Athelia rolfsii (Curiz) Tu. & Kimbrough. It is called Rhizoctonia and belongs to the basidiomycotina fungus. See the morphological characteristics of the mulberry. White ringworm disease.
Transmission Pathways and Pathogenic Conditions Germs are overwintering in the diseased area or soil with mycelium or microsclerotia. When temperature and humidity are suitable in late spring, hyphae are produced and spread around, some spread to adjacent plants; in addition, they can also be transmitted through rainwater, water flow, agricultural implements, etc., and can also be transmitted by remotely communicating nursery stocks. The growth temperature of the bacteria is 25-35°C, and it usually occurs during the rainy season in June-August. Soil viscosity, soil acidity, poor drainage, tea gardens are prone to disease, and the former crops are beans or their incidence is heavy.
Control methods (1) Choose disease-free high-dry plots to plant tea trees. In severe areas or fields, the soil can be treated with 50% cotton wettable powder before planting. The soil is used for 1 to 2.5 kg per 667 m2. Mix well with fine soil and sprinkle on the soil surface in time for cultivation. Plant the plant 15 days later. Tea seedlings, pay attention to prevent injury. (2) Use disease-free seedlings and eliminate diseased seedlings. (3) Application of compost or decomposed organic fertilizer made from enzyme bacteria. (4) The diseased plant was immediately removed and the diseased point was sterilized with 0.3% of 96% copper sulfate solution or 25% carbendazim WP 500 times, and then supplemented with tea plants.
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