霜霉病为世界性月季病害,是保护地切花月季栽培发生较重的病害之一,在全国范围内均有发生。该病不仅传播速度快,而且危害极其严重。植株感病后会造成嫩叶脱落殆尽,同时一些幼嫩枝条干枯,严重影响切花的产量和质量。若发病初期及时救治还能补救,一旦到了后期就很难用药物控制其 Downy mildew is a worldwide disease of roses, which is one of the most serious diseases in cultivated cut rose cultivation in the protected area, and it has occurred throughout the country. The disease not only spreads fast, but also extremely serious. Sick plants will result in shedding of young leaves, while some young shoots dry, seriously affecting the yield and quality of cut flowers. If the early onset of treatment can be remedied in time, once it is difficult to use drugs to control later