本病自50年代被察觉,当时曾误认为是一种生理病或竭斑病,1965年因病状定名为坏疽斑点病,病原为病毒。发病特点,6月上中旬成叶一齐发病,进入高温季节后发病暂停,秋凉后又发病。病叶呈黑褐多角型1—3厘米的斑点,以后变成褐色圆斑,8月病叶脱落,严重时落叶达1/3以上,对产量、品 The disease was detected since the 1950s, when it was mistaken for a physiological disease or exhaustion disease, 1965 due to the disease named gangrene spot disease, the pathogen is a virus. Incidence of disease, in mid-June into the disease together into the leaves, enter the hot season after the onset of the disease suspended, fall and then onset. The diseased leaves were dark brown polygonal 1-3 cm spots, after turning brown spots, fall sick leaves in August, severe deciduous up to 1/3 of the output, the product