通常认为 ,元帅系苹果角质层发达 ,不易产生果锈但观察发现 ,在果实迅速膨大期 ,如遇温度剧烈变化天气 ,元帅系苹果果实阳面皮孔部位也会受铜离子药害而产生锈斑。1 996年 6月下旬 ,为防治果实病害 ,本市王岗村果农对苹果树普喷了一次 1∶2∶2 0 0倍波尔多液 ,药后遭逢持续性高 It is generally believed that the Marshal Department developed apple cuticle, not easy to produce rust but the observation found that in the rapid expansion of the fruit in case of dramatic temperature changes in the weather, the mandarin Department of apple fruit surface area of ​​the skin will be affected by copper ions and produce rust spots. In late June 1996, in order to prevent and cure fruit diseases, Wangguangcun fruit farmers in the city sprayed the apple tree with a 1: 2: 200 times Bordeaux mixture and the drug sustained high persistence