目前防治脐橙脐黄和裂果的有效途径与方法近来收到不少读者来信，询问有关脐橙果实脐部黄化和裂果的问题，在此一并作答。１关于脐黄的发生与防治脐橙果实脐部黄化，简称脐黄，是影响脐橙产量的一种病害。脐黄的起因比较复杂，引起脐黄的原因通常有３种，即生理性脐黄、病... At present, the effective ways and methods for preventing navel orange and cracked fruit of navel orange have recently received letters from many readers asking questions about umbilical yellowing and cracking fruit of navel orange fruit, and are hereby answering the questions. About the occurrence and prevention of navel yellow Navel orange fruit yellowing, referred to as umbilical yellow, is a disease affecting the production of navel orange. The causes of umbilical yellow is more complicated, the reason that causes umbilical yellow usually has 3 kinds, namely physiological umbilical yellow, disease ...