甜玉米以其籽粒在乳熟期含糖量高而得名,现已成为风行世界的新型天然营养品。作为商品生产,甜玉米的经济效益较高。但由于甜玉米具有特殊的营养成份,含糖量高,病虫害相当严重,其中尤以大、小斑病为害较大,且呈上升趋势。甜玉米大、小斑病症状较相似,在田间常混合发生。该病主要为害叶片,严重时叶鞘、苞叶也受害。全生育期均可发病,抽穗后较重。大斑病一般始发于下部叶片,叶片初染病 Sweet corn, known for its high sugar content in milk during its ripening, has become a new natural nutrient in the world of fashion. As a commodity, sweet corn has high economic benefits. However, due to the special nutrition of sweet corn, high sugar content, pests and diseases are quite serious, especially the large and small spot disease are more harmful, and they are on the rise. Sweet corn, small spot disease symptoms are similar, often mixed in the field. The disease is the main damage leaves, severe sheath, bract also suffer. The whole growth period can be disease, heavier after heading. Great spot disease generally occurs in the lower leaves, the first leaf disease