The symptoms are also called black spot disease. The main damage leaves and leaf sheaths. The lesions of the leaves were short round to elliptical, and the central light purple was surrounded by mauve lesions. Occurred in the veins, size 2-8l-3 (mm). Sometimes the gray mold layer is visible on the back of the leaves, ie pathogenic conidiophores and conidia. Late mold layer is not obvious or the formation of small black sclerotia, it is easy to erase or fall off. In severe cases, the lesions fuse into a cloud, covered with leaves, causing the leaves to fall early. Lesions on the leaf sheaths produce purplish-red spots, and the center has a light purple-orange lesion with a size of 5-183-7 (mm), and generally does not produce moldy sclerotia and sclerotia.
The pathogen Ramulispora sorghicola Harris said that the sorghum bifidium is a fungus belonging to the genus Fungi. The conidiophore stalk is colorless, cylindrical, or nearly rod-shaped, and has a septum with a size of 8-282-4 (um). Conidia are colorless, linear to whip, a few have l-2 branches, with 2-10 membranes, size 20-752-4 (um). Sclerotia black, hemispheric to flat spherical, size 80-144um, with bristles around.
The transmission route, disease conditions, and control methods can be found in Gaoliang coalface disease.
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