霜霉病是影响春季大棚黄瓜获得丰产的主要病害之一。虽然在不同的品种和不同的栽培管理水平条件下,病害的发生时间和危害程度历年有所差异,但一般说来,北京地区春茬大棚黄瓜,到了4月下旬至5月上旬,霜霉病便进入了发病期,有些年份,发病始期还要提早。近年来,随着大棚生产的发展,科学管理水平的提高,在黄瓜霜霉病的控制上,也取得 Downy mildew is one of the major diseases that affect the yield of cucumber in greenhouse in spring. Although different varieties and different cultivation and management levels, disease occurrence time and degree of harm vary over the years, but generally, the spring of cucumbers in Beijing, to late April to early May, downy mildew They entered the period of onset, in some years, the incidence of early onset but also earlier. In recent years, with the development of greenhouse production and the improvement of scientific management, the control of cucumber downy mildew has also been achieved