The occurrence and prevention of tea root cancer
Tea Root Cancer (compared with Blight)
Distribution and Symptoms: The main damage to tea seedlings occurred in some tea areas, causing tea seedlings to die. Common in cutting nursery, the main lateral root can be victimized. The bacteria invaded from cuttings or root wounds of the cuttings, resulting in light brown spherical protrusions at the beginning, and then gradually expanded like a tumor, small like miliary, large like peas, multiple tumors often healed into irregular large tumors. Nodule brown, lignified and hard, rough surface. After saplings are damaged, the fibrous roots are reduced, and the above-ground parts grow poorly or die.
Pathogen: Tea root cancer is a genus Agrobacterium tumefaciens (S.et T.) Conn. ]bacterial. The bacteria are short-barreled with 1 to 3 polar flagella. An off-white, round colony forms on plain medium. The optimal temperature for development is 25-29°C and the lethal temperature is 51°C (10 minutes). Developed best at pH 7.3.
The law of occurrence: The root cancer bacteria live in the soil or diseased tissues. When the environment is suitable the following year, it will be harmed by water flow, underground insects and farm implements. The bacteria invade from the wounds or cuts of the seedlings, grow and develop in the tissues, and stimulate the cells to accelerate the division and produce cancerous tumors.
Control methods: strict seedling inspection, prevention of underground pests, and reduction of root wounds. When necessary, seedlings can be soaked with 20% lime water for 10 minutes and then transplanted.
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