玉米丝黑穗病Sphace-lotheca reiliana var.zeae是系统侵染性病害。典型症状在雌、雄穗抽出后呈现。拔除病株是防治丝黑穗病的一项有效措施。但后期拔除却不能挽回当年损失,拔除过程中有遗漏病株、病穗,仍难达到预期效果。因此,探索早期症状表现规律及识别方法,争取对病苗、病株早认、早拔,在防治上有一定意义。我们于1976—1978年进行了初步观察。试验在人工 Sphace-lotheca reiliana var. Zeae is a systemic infectious disease. Typical symptoms appear in the female and male spikes. Removal of diseased plants is an effective measure to prevent head smut. However, the removal of the latter period can not restore the loss of that year. During the process of removal, there are some missing strains and diseased spikes, which are still hard to achieve the expected results. Therefore, to explore the early symptoms and identification of the law of identification methods, for the sick, early recognition of diseased plants, early warning, prevention and treatment have some significance. We made a preliminary observation from 1976 to 1978. Test on the artificial