洋葱锈病遇多雨、多露、重雾天气,易发病和流行,种植过密,氮肥偏多,管理粗放及生长不良时发病重。一、发病症状主要为害叶片、花梗及假茎,很少在花器上发病。发病初期,在叶片上生大小0.5～2毫米,椭圆形至梭形稍隆起的橙黄色粉末。晚秋时,病部形成黑褐色,长椭圆形稍隆起疱斑,表皮破裂外翻,散出暗褐色粉末。发病严重时,叶片布满病斑,病叶变黄、干枯。 Onion rust case of rain, dew, heavy foggy weather, prone to disease and epidemic, planting over dense, nitrogen fertilizer partial, extensive management and poor growth when the disease. First, the incidence of symptoms of the main damage leaves, pedicel and pseudostem, rarely in the flower on the disease. Early onset, the size of the students on the leaves 0.5 to 2 mm, elliptical to fusiform slightly yellow orange powder. Late autumn, the Ministry of the formation of dark brown, slightly oval bulge bulge, epidermal rupture valgus, scattered dark brown powder. Serious onset, the leaves covered with lesions, diseased leaves turn yellow, dry.