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Tea red root rot control method
Transmission route and onset conditions: The pathogens overwinter in the soil or on the diseased roots with mycelium or mycelia, and grow vegetative hyphae to infect the roots through the wound when conditions are appropriate. In the tea plantation, the root cause can be transmitted by contact with roots. In addition, spores can be transmitted by wind and rain. Spores infested from the trimmed stem and entered the root. The course of the disease is quite long and it usually manifests itself only after 10 years of infection. The stumps and roots that remain in the tea gardens will also be the source of infection; tea gardens with weak tree vigor and high groundwater levels are prone to disease. The management of extensive old tea plantations is heavy. Control methods: (1) When establishing a tea garden in a forest or orchard, clean and thoroughly remove remaining stumps or residual roots. Before harvesting the shady trees and trees, make a circular peeling so that the nutrition will not be transmitted. After several months of tree stump nutrient running out, cut it at a height of 30 cm below the ground to prevent the stumps from being exposed. (2) The diseased plants were found to be dug immediately, and then 75% of 13 morpholine EC was used for soil disinfection. Isolation ditch could be dug around the wards and supplemented two years later. (3) Chemical control Dig a circular groove at the base of the disease tree, depth 15-20cm, use 75% of 13 methicillin EC 20ml to 2000ml of water, pour 1/2 solution into the ditch, then cover the liquid Irrigation, once every 6 months, a total of 4 times.