白粉病是月季栽培中最常见、危害最为严重的一种病害。它主要危害植株的叶片,同时也可危及嫩梢、枝条、花蕾与花梗等处。在发病初期,病部出现褪绿黄斑,继而逐渐扩大,叶背病斑处着生一层白色粉状物,如果继续扩展,可使整个叶片背面与嫩梢处都呈现灰白色。严重时叶片扭曲反卷,嫩 Powdery mildew is the most common and most damaging disease in rose cultivation. It mainly harms plant leaves, but also can endanger young shoots, branches, buds and pedicel and other places. In the early stages of disease, the disease appears chlorotic macular, and then gradually expanded, leaf spots at the birth of a layer of white powder at birth, if you continue to expand, can make the entire back of the blade and the tender place are gray. Serious leaves twisted curl, tender