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黄瓜霜霉病是黄瓜生产中的主要病害之一,其流行范围较广,影响较大,特别在塑料大棚及日光温室栽培条件下,黄瓜霜霉病年年发生,为害严重,轻者减产12％～26％,重则达30％以上。因此不同栽培方式,其发生条件和防治方法应有不同。1 日光温室黄瓜霜霉病发生的条件 经调查在临洮县黄瓜霜霉病在冬季日光温室中都能发生为害,春季该病菌向塑料棚黄瓜传播,4、5月份该病菌由塑料棚向露地黄瓜传播蔓延,7、8月份黄瓜上的病菌经风雨传播为害甜瓜或露地黄瓜。秋季、甜
Cucumber downy mildew is one of the main diseases in cucumber production. Its epidemic scope is wide and has a great impact. Especially in plastic greenhouse and greenhouse cultivation, cucumber downy mildew occurs annually, causing serious damage. % ~ 26%, heavy up to 30% or more. Therefore, different cultivation methods, the occurrence of conditions and prevention methods should be different. A solar greenhouse cucumber downy mildew conditions were investigated in Linqu County cucumber downy mildew in the greenhouse in winter can occur in the greenhouse, the bacteria spread to plastic shed cucumber in April and May the bacteria from plastic shed to the exposed cucumber Spread spread, July and August cucumbers on the pathogenic bacteria spread by the rain and melon or open field cucumber. Autumn, sweet