白粉病是一种常见的病害,主要发生在板栗、麻栎、锥栗的苗木和幼树上;桑、漆、三角枫、臭椿等树上也有发生。在被害苗木和幼树上,叶面上下出现黄斑,其上又渐渐产生白粉,随着黄斑不断扩大白粉也越来越多,病叶相继枯焦,寒秋未至便纷纷落叶,从而影响树木的生长。防治方法,冬天可清除落叶,剪去病枝,集中烧毁或制作堆肥;发病期可喷洒波美0.1-0.2度的石硫合剂,或每亩喷撒3-4斤硫磺粉,效果很好。如将西力生和草木灰按1:10的比例混合,撒施后也有效。此外,也可用50％可湿性退菌特1000倍液进行喷洒。 Powdery mildew is a common disease that occurs mainly in seedlings and saplings of chestnut, quercus, and Castanea henryi; trees such as mulberry, lacquer, maple and ants also occur. In the victim seedlings and saplings, there are yellow spots above and below the leaf surface, on which white powder is gradually produced. As the macula grows more and more white powder is added. The diseased leaves are successively burnt, and fallen in autumn and fall, thus affecting the growth of trees. Prevention methods, the winter can clear the leaves, cut off the diseased branches, concentrated burned or compost; the incidence can be sprayed Baume 0.1-0.2 degrees of sulfur sulfur mixture, or 3-4 kg sulfur per mu spraying, the effect is very good. If Xi Lisheng and grass ash mixed 1:10 ratio, also effective after spreading. In addition, 50% wettable bacteria can also be used 1000 times spraying.