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水蕹菜白锈病属真菌性病害,在20~30℃和阴雨连绵或台风暴雨后发病重。偏施氮肥可加重发病。造成减产和降低品质。连作地发病最重。蕹菜若用浮水栽培,可大大减轻该病的发生。一、发病症状水蕹菜白锈病可在根、茎、叶、花等多个器官上发生。初在叶正面出现淡黄绿色至黄色斑点,后变褐色,病斑较大,叶背生白色近圆形或不规则形的隆起状疱斑,后期疱斑破裂散出白色粉锈状物,即病菌的孢子囊。轻碰发病病叶,可见白色粉末飞散。严重时病斑密集,叶片凹凸畸形,造成落叶。茎秆和根部受害变肿大畸形。
Water cabbage white rust is a fungal disease, at 20 ~ 30 ℃ and heavy rain or heavy rain after typhoon. Partial nitrogen fertilizer can increase the incidence. Resulting in reduced production and lower quality. Even the most serious incidence. Ipomoea if floating cultivation, can greatly reduce the incidence of the disease. First, the symptoms Morinda paniculatus white rust can occur in the roots, stems, leaves, flowers and other organs. Beginning in the front of the leaves appear yellowish green to yellow spots, brown later, larger lesion, leaf back white or nearly irregular shape of bulge-like blisters, blisters rupture of the late white powder rusty objects, The bacteria germinal vesicles. Fluttering diseased leaves, visible white powder flying. Serious lesions dense, leaf convex deformity, resulting in deciduous. Stalk and root damage enlargement deformity.