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红粉病是番茄的一种普通病害,主要为害果实,也可以为害叶片。生产上灌水过多,湿度过大,放风不及时,易发病。番茄栽植过密,偏施氮肥,发病重。棚室栽培多在2~4月份,春季温度高、光照不足、通风不良的大棚或温室,易发生。大棚栽培番茄一般是中下部果实先发病。一、发病症状果实:发病果实的蒂部产生水渍状病斑,后变褐色至深褐色,不凹陷,逐渐扩展并环绕果蒂,后期可扩展至整个果面。湿度大时可产生致密的白色霉层,不久其上长满一层绒状浅粉红色霉层,病果最后腐烂。
Powdery mildew is a common disease of tomato, the main fruit damage, but also can damage the leaves. Production is too much irrigation, humidity is too high, the wind is not timely, easy to disease. Tomato over-dense, partial nitrogen fertilizer, the incidence of heavy. More greenhouse cultivation in 2 to 4 months, the spring temperature is high, inadequate lighting, poor ventilation in the greenhouse or greenhouse, prone to occur. Greenhouse cultivation of tomatoes is generally the first incidence of the lower middle part of the fruit. First, the onset of the symptoms of fruit: the fruit of the pedicle lesions produce water-like lesions, after turning brown to dark brown, no depression, and gradually extended and surrounded by fruit pedicle, the latter can be extended to the entire fruit surface. Humidity can produce dense white millet layer, and soon it covered with a layer of velvet light pink mildew, the final fruit rot.