西瓜叶枯病是近年来西瓜上新发生的一种重要病害。随着西瓜面积的逐年扩大和品种的更替,该病在西瓜产区内日趋严重,成为当前西瓜稳产、高产的又一重大障碍。据调查,常年一般发病瓜田减产15—30%,严重的可达60—70%以上。此病在国内尚缺乏研究,国外在病害症状和生物学特征方面有过报道,但缺乏发病规律等方面的资料。为此,我们于1988年开始,对本病进行了研究,现 Watermelon leaf blight is an important new disease on watermelon in recent years. With the year-by-year expansion of watermelon area and the replacement of varieties, the disease is becoming more and more serious in the watermelon producing areas and has become another major obstacle to the steady and high yield of watermelon at present. According to the survey, the perennial average incidence of melon fields cut 15-30%, severe up to 60-70%. The disease is still lack of research in the country, foreign disease symptoms and biological characteristics have been reported, but the lack of incidence of law and other aspects of the data. To this end, we started in 1988, studied the disease, now