MySheen

Cancer of tea root

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, Symptoms occurred in Anhui, Zhejiang, Guangdong and other provinces. It mainly harms the roots. At the beginning of the disease, the main root and lateral root produced light brown spherical protuberances, and then expanded into tumors, small ones like grains, large ones like broad beans, multiple small tumors gathered together to form large tumors, and later tumors became brown and Lignification, rough surface and hard texture. Cutting seedlings infected with little or no roots, resulting in slim plant weakness or leaf yellowing and shedding, plant death. Pathogen Agropyi μ Mt μ mefaciens

Symptoms occurred in Anhui, Zhejiang, Guangdong and other provinces. It mainly harms the roots. At the beginning of the disease, the main root and lateral root produced light brown spherical protuberances, and then expanded into tumors, small ones like grains, large ones like broad beans, multiple small tumors gathered together to form large tumors, and later tumors became brown and Lignification, rough surface and hard texture. Cutting seedlings infected with little or no roots, resulting in slim plant weakness or leaf yellowing and shedding, plant death.

The pathogen Agrobacterium tumefaciens (SmithTownsend) cinn is called Agrobacterium tumefaciens, which belongs to prokaryotes. The pathogenic bacteria were short rod-shaped, 1.5 × 0.4-0.8 (Ftm) in size, with 3 weekly flagella, capsular, and negative for Gram staining. The colony was white to grayish white on Agar medium. The strain has a wide host range and can infect more than 300 kinds of plants. The optimum temperature for development was 25 ℃ 30 ℃, 51 ℃ was killed in 10 minutes, and the optimum PH7.3 was found. Die in 25 minutes in 10% lime milk.

Transmission routes and disease conditions of bacteria overwintering in soil or diseased tissue, transmitted by irrigation water or Rain Water, can also be transmitted by underground pests and bacteria-carrying tools. Long-distance transmission can also be carried out with diseased soil and diseased seedlings. The germs invade the cortical tissue from the wound or incision and grow and multiply. The cells around the wound accelerate division due to the stimulation of bacteria, forming a large number of proliferative tumors. Whether there are wounds and incisions in the production of seedlings is an important condition for the occurrence of the disease. The nursery with low-lying terrain, high soil moisture and heavy soil viscosity is easy to suffer from the disease.

Prevention and control methods (1) strict quarantine, the transfer of seedlings from the disease area is strictly prohibited. (2) the cutting nursery was established on the unplanted land with leeward and sunny, good drainage and loose soil. (3) strengthen the management of tea garden, control underground pests in time, and do everything possible to reduce root wounds. (4) the diseased points were disinfected with 96% copper sulfate solution or 100-fold Bordeaux solution with 1% copper sulfate or 100-fold Bordeaux solution after discovering the diseased plants in time, or 1000 times of 1000-fold emulsion of 80% antibacterial agent 402.

 
0