Medicinal plant yam spot blight
Symptoms mainly affect the leaves. At the beginning of the disease, brown spots appear on the leaves. After the lesions are polygonal or irregular, the size is 6-10mm, the central brown is brown, the edges are dark brown, and the upper black spots are small, that is, the pathogenic conidia . Severe disease, dry leaves, the whole plant withered. The disease is common in the fall.
Pathogen Septoria dioscoreae J. K. Bai Lu called the spore of Dioscorea cinnamomea, a fungus belonging to the subphylum Aspergillus. Conidia are spherical to nearly spherical, born on foliar, scattered or aggregated, breaking through the epidermis exposed, dark brown wall of membranous, size 90-144μm; conidia inverted stick, nearly cylindrical, straight or slightly curved , Wide and narrow, colorless, transparent, with 2-14 membranes, base obtuse round, top blunt, size 60,704-6 (μm).
Transmission routes and pathogenic conditions The pathogenic bacteria overwinter on diseased leaves with conidial devices. When the temperature and humidity conditions are suitable in late spring, the conidia released by the conidia spread through wind and rain, and undergo initial infection and repeated infection. The disease continues to expand. The disease occurs more commonly during the seedling and the autumn.
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