Distribution and symptoms:
Distributed in tea production areas, but it is more common in North China and East China. The disease mainly occurs in the seedling stage and adult plant stage. It damages the roots or roots and necks. It first rots brownish roots or dark browns, then spreads to the lateral roots and becomes purple-brown after decay. The lesions are covered with purple-brown filaments. On the surface of the disease, there is a hemispherical granular granular nucleus and small stem base plus centimeter, which is often surrounded by purplish red seedlings. The texture is soft, and it is easy to peel off. The root cortex is also easy to exfoliate. In severe cases, the ground part is wilting and the new shoots are reduced. The diseased plant died.
The law of occurrence:
Usually at the turn of spring and summer or at the turn of the summer and the autumn, the occurrence of high temperature and rain is heavy. Whereever the high groundwater table, poor drainage, excessively dry soil, tea gardens are susceptible to disease. The bacteria can survive in the soil for many years and operate with farming; rain, underground pests and roots contact and spread and spread. Long-distance spread can also be carried out when transporting carriers of seedlings and soil. Continuous crops and former susceptible crops are also susceptible to disease.
Control methods:
Sterile and healthy seedlings were used. The diseased seedlings were found to be excavated and burned in time. The tools were washed after use, and then the other healthy seedlings were immersed for 1 hour with 20% lime emulsion, or 50% of carbendazim 1000 dilutions were soaked for half an hour. After planting. Drainage and tea gardens with high water levels should pay attention to drainage. Drainage trenches should be dug before boring. Soils that had previously been planted with sweet potato, potato, and fruit trees and had been affected with this disease were disinfected with 70% chloronitrobenzene, 2.5 kg of fine soil per acre for soil disinfection, or 30 times diluted with formalin. The soil was poured into the soil and the root and neck were poured with potassium permanganate or a 1000-fold dilution solution at the beginning of the disease.
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