Medicinal Plant Yellow Blight

Rehmannia glutinosa (Gaertn.) Libosch is a perennial herb of the family Scrophulariaceae, and its roots are used as medicine. With Yin and kidney, heat and cooling blood, through the blood, eliminate blood stasis and other functions. Due to the different processing methods, medicinal herbs have different names of fresh yellow, rehmannia root (birthplace), and rehmannia glutinosa (rehabilitate). Many provinces in China have cultivated.

Symptoms of diseased plants only began to decay at the roots near the ground. The diseased tissues changed from yellow to brown and gradually expanded to the upper part of the ground. Water-soaked brown spots appeared on the petiole of the outer leaves and spread quickly to the heart. Petiole Decay and wilting leaves. When the humidity is high, white cotton-like mycelium is produced in the diseased part, and the root stems farther away from the ground are rotted in the later period; when severe, only the brown epidermis and xylem are left to be rot, and the fine roots are also dry and rot.

The pathogen Phytophthora cactor μm (Leb. et cohn) is known as Phytophthora viridans, which is a flagellin subphylum fungus. In the V8 juice medium, the mycelium was grayish, cotton-like, with neat edges and medium lush. Hyphae without separation, colorless and transparent, less branches, no nodular phenomenon, the thickness of mycelium with younger changes in mycelium, the young mycelium is more slender, 2.3-3.0μm wide; old bacteria The silk is coarse, slightly yellowish, with a width of 5-6 μm; the general hyphae is 2.5-4 μm wide, and the branches are nearly straight-angled. There is no difference between cyst stalks and mycelia, and the branches are commissural and the sporangia are endogenous. The number is large and no layer appears. Sacoid pear-shaped, 24-24019-25(μm), aspect ratio 1.0-1.5(1.2), sporangia with prominent papillae, papillae 2.3-3.3 μm, width 4 - 5μm. The sporangia are easy to fall off and the base is nearly circular. Most of them have a small stem and the stem length is 3-6 μm. Sporangia is easy to germinate in water and releases zoospore. The outlet of the capsule is 4-7 μm wide, and the zoospore is kidney-shaped. It is nearly spherical when resting. The pathogens are the same strains of bacteria, with a large number of ovipositors, spherical, pale yellow, smooth surface and a diameter of 29-36 (33) μm. The male flat spheroids are mostly the same as the silks, with fewer filaments, smaller, usually 8-17 μm; oospores are spherical, pale yellow, 19-25 μm in diameter, nearly full, and wall thickness 2.5-4.0 μm. The optimum temperature for growth is 23-28°C. Without the formation of thick-walled spores, it is common to have few sporangia on PDA, and the number of ovipositors and oospores is small.

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