1.白粉病月季主要病害之一,发生普遍且危害严重,是世界性病害,我国月季栽培区几乎均有发生,尤以重庆、苏州、郑州、太原、西宁、丹东、呼和浩特、沈阳、兰州、银川等地最为严重。感病植株叶片枯萎、花姿畸形或不能开放,严重影响月季切花生产和观赏效果。白粉病能侵染叶片、叶柄、嫩枝、花蕾、花梗、萼片等部位,但最易侵染的是嫩叶、嫩梢和花蕾。嫩叶感病后皱缩、变厚、反卷。老叶染病后叶面出现褪绿黄斑,并逐渐扩大,严重时全叶枯萎脱落。嫩梢受害后,病部稍膨大并向下弯曲。花蕾感病后花姿变成畸形,甚至不能开放。上述所有受害部位的 1. Powdery mildew One of the major diseases of the rose, which is common and harmful, is a worldwide disease. Almost all the cultivated areas in China are occurring, especially in Chongqing, Suzhou, Zhengzhou, Taiyuan, Xining, Dandong, Hohhot, Shenyang, Lanzhou, Yinchuan and other places the most serious. Sick leaves of withered plants, flower posture abnormalities or can not be open, a serious impact on rose cut flowers production and ornamental effect. Powdery mildew can invade leaves, petioles, shoots, buds, pedicels, sepals and other parts, but most vulnerable to infiltration of young leaves, tender shoots and buds. Young leaves after the shrinkage, thickening, anti-roll. The old leaves appear chlorotic macula after foliar infection, and gradually expanded, severe full-leaf blight off. After the tender shoots, the diseased part slightly inflates and bends downward. Flower buds become sick after the deformity, or even not open. All the affected parts of the above