霜霉病是近几年来危害我县葡萄生产的主要病害之一。此病自6月中、下旬初发病,至7月中下旬发病渐重,8—9月仍大量发生。受害重的果园叶片几乎落光,对葡萄生长、结果影响极大。为了提高防效,寻找有效农药,我们于1980年进行了田间药剂对比防治试验。试验结果证明,300倍乙磷铝对葡萄霜霉病有较好的防治效果。现将试验情况及 Downy mildew is one of the main diseases that endanger the grape production in our county in recent years. The disease since mid-June, early onset, late in mid-July to become more serious, 8-9 months is still a large number of occurrence. Victims of the orchard leaves almost falling, the growth of grapes, the results have a great impact. In order to improve control efficiency and find effective pesticides, we carried out field control trials in 1980. Test results show that 300 times of aluminum phosphorus on grape downy mildew have a better control effect. Now the test situation and