山楂白粉病是山楂生产上的重要病害,在辽宁发生普遍,危害严重,目前生产上多以石硫合剂防治,使用很不方便,常因使用不当而引起药害或效果甚差。因此,应尽快筛选出高效、经济、安全的新农药防治山楂白粉病。1987年,我们在朝阳市龙 Hawthorn powdery mildew is an important disease in the production of hawthorn, which is common and harmful in Liaoning Province. At present, most of the hawthorn powdery mildew is controlled by lime sulfur mixture, which is very inconvenient to use. It is often caused by improper use or very poor in efficacy. Therefore, should be screened as soon as possible efficient, economical and safe new pesticides against hawthorn powdery mildew. In 1987, we are in the city of Chaoyang