主要症状芋头炭疽病主要危害叶片,严重时也危害球茎和叶柄,多从下部老叶开始发病,初期在叶片上产生水渍状暗绿色病斑,以后逐渐变为近圆形、黄褐至暗褐色病斑。干燥条件下病斑干缩成羊皮纸状,易破裂,上面轮生黑色小点(见图)。球茎染病,上生圆形病斑,似漏斗状深入肉质球茎内部,病组织呈黄褐色。炭疽病与疫病有时混合发 The main symptoms Taro anthrax leaves the main hazards, but also in severe damage to the bulbs and petioles, and more from the lower part of the old leaves began to attack, the early leaves on the water-like stains produce dark green lesions, and later gradually become nearly circular, yellow to dark Brown spots. Drying conditions dry shrink into parchment-like, easy to break, the above rotation black dots (see photo). Bulbosis, unripe circular lesions, like funnel-shaped corolla inside, sick tissue was brown. Anthrax and the disease sometimes mixed hair