Symptoms are distributed throughout the tea regions of the country and the southern tea region suffers. The diseased strain leaves are sparse and some die. Under normal circumstances, the leaves of the diseased plants withered on the branches, and fell off after a period of time. Pull out the roots of the roots can sometimes be seen from the roots of a white to red leathery branching pellicles, dark red to purple later, peeling the root between the skin and the xylem can also be seen between the white pellicle membrane, xylem no stripes. There are often flat fruiting bodies at the neck or stem, as well as ganoderma.
Pathogen Ganoderma applanatμm (Pers.) Pat. Ping Gai Ganoderma and Poria hypobrunnea Petch, known as porophilus, are basidiomycotina fungi. The fruiting body of Pentocyanus verrucariae was light yellow at first, then turned reddish to blue-gray, flattened, clinging to the stem or root neck, 3-6 mm thick, and the edge was white, narrower and to be villi. Mycelium dark purple-brown, felt-like, thick 3mm. The ribs are wide and stick-like, with a size of 9 to l0.54.5-5 (μm). Spore size 4-63.5-5 (Ftm), sub spherical to spherical or triangular, smooth, colorless.
Transmission Pathways and Pathogenic Conditions Germs or mycelia grow overwhelmingly in soil or on diseased roots. When conditions are appropriate, vegetative mycelium grows through the wound to infect the roots. 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.
Prevention methods (1) When setting up a tea garden in a forest or an orchard, clean and thoroughly remove the 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.
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