我们在1986—1987年,对常用杀菌剂防治苹果白粉病进行了试验,试材为病梢率在45%以上的红玉品种。结果,在白粉病发病初期(4月21日)喷15%粉锈宁600倍液,每隔15—20天连喷三次,效果非常显著,两年病叶率分别仅6.6%和7.0%,而对照(不喷药)达76.5%和81.7%. 其他杀菌剂连喷三次的防治效 We in 1986-1987, the commonly used fungicides against apple powdery mildew were tested, the test material for the shoot rate of more than 45% of red jade varieties. As a result, 15% triadimefon 600 times were sprayed on the early stage of powdery mildew (April 21) and sprayed three times every 15-20 days. The effect was very remarkable. The two-year diseased leaves rate was only 6.6% and 7.0% (No spray) up to 76.5% and 81.7%. Other fungicides even spray three times the control effect