Symptoms mainly affect the leaves and stems. Leaf lesions are now round to irregular brown to dark brown lesions. Field common lesions and small lesions of two types. Large lesion diameter of 1-10mm, with concentric ring pattern, with black moldy; small lesions are round to nearly round, the ring pattern is not obvious, the edge is slightly raised, the internal light brown. Veins and culms were infected with black-brown, water-soaked streaks, and severe plants withered. Pathogen Alternaria sesami (Kawamura) Mohanty et Behera. Synonyms A.sesamicola Kawamura called Alternaria ana is a fungus belonging to the genus Deuteromycotina. Conidiophores tan to dark brown, unbranched, with septa, size 32-983.5-6 (μm). Conidiophores are yellow-brown and club-shaped, single or two, with 3-12 septa, 0-9 septum, 26-1026-26(μm), and long. The optimum temperature for pathogenic bacteria growth is 20-30°C, and the optimum pH is 4.5. Transmission routes and conditions The pathogenic mycelium is present in the seed coat of the diseased seed and occasionally enters the embryo or endosperm. Germ disease is transmitted along with seeds or pods. Frequent rainfall and high humidity prone to disease; the evening's relative humidity and daily maximum temperature have a great impact on the disease; sesame grows at a time when the weather is sunny or sunny and rain is frequent. Prevention methods (1) Selection of resistant varieties such as Vi2, No-4, JT-7, etc., which were selected in India. (2) spraying 70% mancozeb WP 500 times or 3:3:500 times Bordeaux mixture, 40% chlorothalonil suspension 500 times, 80% after 30 days, 45 days and 60 days after sowing Penco WP 600 times, 50 pp. Hydrin WP 1500 times. Natural, No-addition, Fig series products WEIHAI ACCELERATE BIOTECHNOLOGY CO, LTD , https://www.accelerfig.com