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月季白粉病是月季常见病害,凡栽培地区均可发生此病,引起大量叶卷曲、焦枯,嫩梢枯死,花不开放或花姿不整,影响生长和观赏。一、发病症状叶片、叶柄、花蕾及嫩梢等部位均可受害。初期,叶上出现褪绿黄斑,逐渐扩大,以后着生一层白色粉
Rose powdery mildew is a common disease of roses, where the cultivation of the disease can occur, causing a large number of leaf curly, scorching, tender shoots withered, flowers are not open or the flowers are not full, affecting growth and ornamentation. First, the incidence of symptoms Leaf, petiole, buds and other parts of young shoots can be harmed. In the early stage, chlorotic macula appeared on the leaves and gradually expanded, giving birth to a layer of white powder