Symptoms occur in all tea regions throughout the country. Common gray plaster disease, brown plaster disease two. Occurs mainly in shoots and rhizomes, forming thick pellicles on branches. The grey plaster was born with a white fluffy hair, which turned dark gray and dark brown in the middle. Thicker, thinner around, smooth surface. When the humidity is high, it is covered with a layer of white powder. Brown plaster disease forms ellipsoidal to irregular thick pellicles on branches or rhizomes, and sticks on sticks like plasters, chestnut brown, slightly thicker than gray plasters, velvety on the surface, coarse, with a narrow grayish edge With late cracks on the surface, easy to fall off.
Pathogenic gray plaster disease pathogen Septossidiμm pedicellatμm (Schw.) Pat. The septum lentil is a basidiomycotina fungus. There are two layers of hyphae. The primary mycelium is separated and colorless. It turns brown to dark brown later, and the branches are luxuriant and interlaced into pellicles. The sub-solid layer first grows the original burden, and then produces a colorless cylindrical load on the original burden. It is initially straight and then bent. It has a size of 20 to 40–8 (μm) and is separated by three. Each cell draws a small amount. Stem, top born with a spore. The spore-like cells are colorless and oblong, with a size of 12-243.5-5 (μm).
The brown plaster pathogen, Septobasidiμm tanakae Miyabe, is a trichomonium spp. in the genus Basidiomycetes. Mycelium brown with septate, also has two layers, staggered densely integrated thick film, and more directly from the mycelium burden, colorless, stick-like, with three separate, straight or curved, size 27-538-11 (μm) The lateral stalks are born with 1 spores each. The spores are colorless and oblong.
Transmission routes and pathogenic conditions The pathogens overwinter on the branches with mycelium. In the late spring and early summer of the following year, when the humidity is high, sub-solid layers are formed, resulting in the formation of spores. The brachyspore spreads through the air and the beetles, and the hyphae grow rapidly. Bacteria. Poorly soiled or poorly drained soil, old tea gardens with large hidden humidity are prone to disease, and tea plantations with serious locust infestation are seriously affected.
Prevention methods (1) Tea gardens with severe disease, promote heavy shearing or cutting, and branches cut off and burned. (2) It is very important to control tea tree insects. For specific methods, see Tea Tree Pest Control Methods.
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