Symptoms are also called rosy spot disease. It is common in Fujian, Taiwan, and southern China. The main damage is old leaves, but it can also damage leaf sheaths and cane stalks. The lesions on the leaf were initially dark green to brown, long oval, with a narrow pale yellow edge, and the size of lesions varied on different sugarcane species, generally 10-122.4-4 mm or more. After the lesions are enlarged, the shape is irregular and the lesions merge into larger red-brown patches. The center of the old lesion turns yellow, usually with a pale red edge, and sometimes the entire lesion remains red-brown.
Pathogen Leptosphaeria sacchari Breda said that Saccharomyces cerevisiae belongs to Ascomycete spp. The asccus is born under the epidermis, spherical, and brown. The asccus is cylindrical, the length of the false side wire and the ascendum are equal. Ascospores spindle-shaped, with three septa, colorless, size 19 to 234.5 to 6 (μm). The anamorphic state is Phyl10sticta saccharicola P. Henn called cane leaf spot fungus, belonging to the fungus Aspergillus subgatum. The conidia are initially colorless and light brown when aged and are 10 to 303 to 3.5 (μm) in size.
Transmission routes and disease conditions The disease is mainly caused by ascospores spread to the sugarcane leaves with the wind and rain to cause new infections, and the incidence is highest in the hot and humid season.
Control methods Breed resistant varieties.
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