What can prevent sesame leaf blight?

What can prevent sesame leaf blight? Please introduce the distribution and damage of sesame leaf blight: it occurs in all sesame producing areas in China. The disease is caused by the fungus Corynespora hyacinth. In addition to harm sesame, but also harm soybeans, straight beans and other crops. Symptoms/morphological characteristics: after seedling damage, leaf stem dies; damaged leaves produce small brown spots at the beginning, then turn pale brown angular spots, or do not shape large spots, and have inconspicuous whorls and brown mold layers, i.e. conidia and conidia of the pathogen; the spots on stems are brown, fusiform or linear, with a concave center; the spots on capsules are reddish brown or purple, slightly concave. Pathogen overwinters in conidia and hyphae on seeds or diseased plant residues. Mycelia on seeds can survive for more than 2 years, conidia on diseased bodies still have %% survival rate after one year. Conidiospores spread by wind and rain, carrying out primary infection and multiple reinfection. The optimum temperature for growth of the pathogen was 27-30℃. When the plant growth is weak and the field humidity is high, the disease is serious. Control methods: 1. Agricultural measures to remove the residues of diseased plants in the field, deep return to the land; avoid planting sesame in low-lying land; select seeds from disease-free land; strengthen cultivation management, reasonably plant closely, increase organic fertilizer and phosphorus and potassium fertilizers, clear ditches and drain water to reduce field humidity. 2. At the early stage of disease control, spray 40% carbendazim colloidal suspension 700 times solution, or 25% carbendazim WP 500 times solution, or 70% mancozeb WP 600 times solution, or 70% thiopril methyl WP 700 times solution, etc. It is best to spray once at flowering stage and before capping. Click for more sesame cultivation technology Click for more grain crop cultivation technology