Medicinal plant gray spot

Symptoms mainly affect the leaves. The lesions are round to near-circular, with a size of 2-10 mm. The center is gray-brown and the edges are light brown to yellowish brown. The lesions on both sides of the body were pale black moulds, namely the pathogenic conidiophores and conidia. When the condition is serious, the lesions fuse into pieces, causing the leaves to die.

The pathogen, Cercosporidium dubium (Riess) Liu et Guo, is known as Brachychior spp. Synonym: Cercosopora dubia (Riess.) Wint. The fruiting body leaves two sides. The stem is subepidermal or stomatal, spherical, 20-52μm in diameter, light brown to brown. Mycelium is divided and dark. The conidiophores are brown or nearly colorless, 3-20 clustered, unbranched, with 0-1 knees, 1-4 diaphragms, and nearly truncated apical scars. Conidia cylindrical to inverted stick-shaped, colorless, transparent, straight or slightly curved, nearly truncated base, top obtuse, base umbilical obvious and thick, wide 1.9-3.8μm, size 35-62.55- 7.5 (μm).

Transmission routes and pathogenic conditions The pathogens use hyphae to overwinter on sick bodies. When conditions in late spring are suitable, conidia are initially infested and reinfected with airflow. The northeast and north China occurred in June and were more common.

See menthol gray spot disease prevention methods.

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