深冬季节越冬栽培的黄瓜容易发生灰霉病,它是黄瓜生产中的一种主要病害,除危害果实外,还可危害茎、叶、花,造成烂苗、烂花、烂果。发病症状。病菌先从顶端开败的花瓣开始侵入,并长出淡灰色霉层,进而向幼瓜扩散,造成果实烂头,甚至全部果实腐烂。花和幼苗,感病后呈褪色、变软、腐烂,表面密生灰白色霉状物,轻者生长停滞。烂花上的霉状物或残体落于茎蔓和叶片上,导致叶片和茎蔓发病。一般叶部病斑,先从叶尖发生,初为水浸状,后为淡灰褐色,病斑中部有时产生灰 Cultivated winter cucumber prone to gray mold disease, it is cucumber production in a major disease, in addition to damaging the fruit, but also can endanger stems, leaves, flowers, causing rotten seedlings, Burnt-out, rotten fruit. Symptoms. The bacteria began to invade from the petals that had been defeated at the top and grew a light gray moldy layer, which in turn spread to the young cucumber, causing the fruit to rot or even the entire fruit decay. Flowers and seedlings, after the disease was faded, soft, decay, surface gray mold mildew, light stagnant growth. The moldy material or residue on the burnt-flower falls on the stalks and leaves, causing the leaves and stalks to become diseased. General leaf lesions, the first occurrence from the tip, the beginning of the flooding-like, after the light gray-brown, the lesion sometimes gray central