茎点枯病:主要发生于芝麻开花结蒴期。高温高湿有利于病菌侵入和扩展。特别是在雨后骤晴发病重。发病症状:根部发病后,逐渐变褐枯萎。茎部病斑初呈黄褐色水渍状,与健全组织无明显界线,继而发展为绕茎大斑并蔓延,病斑呈黑褐色、中部银灰色、有光泽、密生针尖大的小黑点。病株叶片自下而上呈卷缩萎蔫状,黑褐色,不脱落,植株顶端弯曲下垂。蒴果发病 Stem spot blight: Occurs mainly in sesame flowering knot bolt period. High temperature and humidity is conducive to invasion and expansion of germs. Especially in the clear after the rain sunny onset. Symptoms: After the onset of the root, gradually browning withered. Stem lesions at the beginning of yellowish brown water stain, with no obvious boundaries with healthy tissue, and then developed into a large spot around the stem and spread, disease spots were dark brown, central silver gray, shiny, dense small needle tip black spots. The leaves of diseased plants were curly wilted from bottom to top, dark brown, not falling off, the top of the plant bent and sagging. Capsule disease