水稻和小麦霜霉病,也叫黄化萎缩病(日本)。1890年首先在澳大利亚发现,以后,日本、意大利、美国以及我国的东北、华东和台湾也相继报道发生此病。我教研组的同志,1974年在番禺石基公社的早造水稻上首先发现并鉴定此病。此后,1976年春我们在花县新华公社的三华、大华两个大队进行调查,发现有50多亩的水稻发生霜霉病,轻病田发病率是7％,重病田则达68.27％。以后,广州市郊、新会、中山、东莞和丰顺等县相继在冬种小麦和早稻秧苗上发现霜霉病。据广州市郊人和公社反映,那里早稻霜霉病秧 Rice and wheat downy mildew, also known as etiolated atrophy (Japan). First discovered in Australia in 1890, later, Japan, Italy, the United States and China’s northeast, east and Taiwan have also reported the disease. My teaching and research group comrades in 1974 in Panyu Shiji commune early rice first discovered and identified the disease. Since then, in the spring of 1976, we investigated the two brigades of Sanhua and Dahua in Xinhua Commune in Huaxian County and found that 50 mu of rice had downy mildew. The incidence of mild disease was 7% and that of severe illness was 68.27%. Later, suburbs of Guangzhou, Xinhui, Zhongshan, Dongguan and Fengshun counties found downy mildew on winter wheat and early rice seedlings. According to reports from Guangzhou suburbs and communes, there is mildew downy rice seedling