眼下,正是大棚黄瓜生产季节,冬季低温寡照天气多,黄瓜病害也多,尤其是黄瓜灰霉病、蔓枯病这几年发病较重。由于这两种病害初期发病多先从叶片开始,从叶片上看发病症状有许多相似的地方,所以在判断上往往出现失误,不能对症下药,延误防治时机,造成不应有浪费。这两种病害发病后叶片都表现出大的病斑,病斑直径都在10~35毫米之间,后期病斑中央都会出现裂口,病部都出现灰色霉层和小黑点,病斑都有 Right now, it is the greenhouse cucumber production season, winter low temperature weather more, cucumber diseases are also more, especially cucumber gray mold, gummy blight heavier incidence in recent years. Because these two diseases first onset more leaves from the beginning, from the leaves on the onset of symptoms there are many similarities, so the judge often mistakes can not be the right medicine, delay the timing of prevention and control, resulting in no waste. After the onset of these two diseases showed a large lesion lesions, lesion diameter of 10 to 35 mm between the late lesion will appear in the central gap, the disease appeared gray mildew and black spots, lesions are Have