小麦生长中后期是病虫害的多发期,抓好防治工作是夺取小麦高产、提高品质的重要管理措施。因此,识别和掌握小麦中后期“五病五虫”的症状及防治技术,尤其重要。只有正确的认识小麦病虫害症状是哪种病虫害所致,方能帮助农民朋友“对症下药”。一、小麦中后期病害症状和防治技术 1.纹枯病:病症主要表现为地表处小麦茎节叶鞘上,先产生不太明显的周边褐色、中部潜褐色或灰白色的梭形病斑,以后病斑逐渐扩展,呈云纹状;向内可侵入茎壁部,向上可发展到倒二叶 The latter part of the growth of wheat is a period of pests and diseases. Paying close attention to prevention and control work is an important management measure to seize high yield and improve quality of wheat. Therefore, it is especially important to identify and master the symptoms and the prevention and cure technologies of mid and late wheat “five disease and five insects”. Only correct understanding of the symptoms of pests and diseases of wheat caused by pests and diseases, can only help peasant friends “remedy ”. First, the wheat disease symptoms and prevention and treatment of mid and late 1. Sheath blight: disease mainly on the surface of wheat stem leaf sheath, the first to have less obvious peripheral brown, central subdued or gray fusiform lesions, later disease Spot gradually expanded, was moire-like; inward invasion of the stem wall, up to the second leaf can be developed