番茄早疫病又称轮纹病,近年来在我市郊区发生、为害日趋严重。据调查,受早疫病为害严重的苗床,发病率达100％,病情指数达90。有的苗床发病轻的,移栽大田后如果管理不及时,病害发展也很快。因受早疫病的为害,有时减产60％左右。 为害症状 番茄的茎、叶、叶柄、果、果柄都能被早疫病菌侵害。病斑初呈深褐色或黑色圆形的小斑点,以后逐渐扩大,直径可达1～2厘米,边缘深褐色,中央灰褐色,有同心轮纹。苗期以为害茎为主,受害严重的病株, Early blight tomato disease, also known as ring disease, occurred in the suburbs of our city in recent years, the damage is becoming more serious. According to the survey, severely affected by early blight seedbed, the incidence of 100%, the disease index of 90. Some seedbed incidence of light, transplanted field after the management is not timely, the disease developed rapidly. Damage caused by the early blight, sometimes cut about 60%. Damage symptoms tomato stems, leaves, petiole, fruit, fruit stalks can be infested by the Yarrowthroat. Lesions were initially dark brown or black round small spots, and later gradually expanded to 1 to 2 cm in diameter, dark brown edge, the central gray-brown, with concentric pattern. Stalk-based harm to the main stage of the serious victims of disease strains,