宁晋县蔬菜面积13万亩,其中保护地(大棚)蔬菜达3万多亩,保护地黄瓜就有1万多亩。保护地栽培黄瓜霜霉病是该县的主要病害之一,严重的可以造成减产30%以上。弄清保护地栽培黄瓜霜霉病的发生规律及抓好霜霉病的防治是黄瓜高产的关键。 Ningjin County, vegetable area of ​​13 mu, of which the protection of (greenhouse) up to 30,000 acres of vegetables, cucumber protection have more than 10,000 acres. Protected cultivation of cucumber downy mildew is one of the major diseases in this county, which can lead to a serious loss of more than 30%. To understand the law of cucumber downy mildew cultivation and control of downy mildew is the key to the high yield of cucumber.