白叶桔病是水稻的严重病害,十九世纪末首先在日本发生,其后逐渐扩大到东南亚及南亚次大陆各国稻区。近年来,澳洲、美州和欧洲个别稻区也有此病的报导。我国五十年代主要发生在南方部分稻区,现除新疆和东北北部外,各省都有不同程度的发生,流行年份造成严重损失。培育和选用抗病良种是最经济有效的防治措施。据有关资料报导,早在本世纪二十年代初期日本就开始了水稻的抗病育种,培育的抗病品种“黄 White leaf orange disease is a serious disease of rice. It first occurred in Japan at the end of the 19th century, and then gradually expanded to other rice growing areas in Southeast Asia and the subcontinent of South Asia. In recent years, reports of the disease have also been reported on individual rice areas in Australia, the United States and Europe. China’s fifties occurred mainly in some rice areas in the south. Except for Xinjiang and the northern part of northeast China, the provinces all have different degrees of occurrence, causing serious losses in the popular years. Breeding and selection of resistant varieties is the most economical and effective control measures. According to the information reported, as early as the early twenties of this century Japan began a disease-resistant rice breeding, cultivating the disease-resistant variety "yellow