芋头疫病一般在6月下旬至8月上旬发生,高温、高湿季节发病重,是影响芋头产量和品质的主要病害。症状此病主要危害叶片,其次是叶柄和球茎。发病初期,叶上初生黄褐色圆形小斑,扩大后有同心轮纹,病斑常会合成不规则的大斑, Taro blight usually occurs from the end of June to early August, and it is the main disease that affects the yield and quality of taro in high temperature and high humidity season. Symptoms The disease harms leaves, followed by petioles and bulbs. Early onset, leaves on the newborn brown small round spots, expand the concentric ring pattern, the lesion often synthesis of irregular big spot,