论文部分内容阅读
番茄晚疫病是一种流行性很强的真菌病害。从苗期至结果期均可发生,常减产20—30%,严重时可以毁棚。1.症状识别,叶、茎和果实均可受害,但以叶片和青果受害严重。幼苗期发病,叶片出现暗绿色水浸状病斑,很快向叶柄和茎部扩展,叶腋处病斑黑褐色,常造成幼苗萎蔫倒伏。空气湿度大时病部边缘产生稀疏白色霉层。成株期多由下部叶先发病,从叶尖、叶缘开始,
Late blight is a highly epidemic fungal disease. From the seedling to the fruiting period can occur, often 20-30% reduction in production, serious can be destroyed shed. 1. Symptom identification, leaves, stems and fruits can be affected, but the leaves and green fruit serious damage. Emergence of seedling stage, the leaves appear dark green spot-like flooding, and soon to the petiole and stem expansion, leaf axil at the spot dark brown, often resulting in seedlings wilting lodging. Air humidity is large when the edge of the Ministry of disease sparse white mold layer. Adult from the lower part of the first onset of disease, from the tip, leaf margin began,