梨黑星病是中国梨的主要病害之一，五十年代北京即将其列入重点防治对象。无论是鸭梨、白梨、秋子梨、酥梨等均严重发生，原来较抗病的雪花梨现在也感病，每年都造成极严重的经济损失。我国从五十年代开始对梨黑星病进行了大量研究，提出了不少防治措施。如在梨树发芽前喷代森 Pear scab is one of the major diseases of Chinese pears. In the 1950s, Beijing was about to put it under its control. Both pear, white pear, autumn pear, pear and so on are serious, the original disease-resistant snow pear now also susceptible, every year, causing very serious economic losses. Since the 1950s, China conducted a great deal of research on pear scab and put forward many prevention and control measures. Such as Pear spray spray before dawn