1974年冬种后不久,即出现麦苗大面积发黄。据白泉公社金星、万强二个大队在12月中旬调查,黄苗面积达422亩,占大麦面积的64%,发生期之早、面积之大,为历史上所罕见。为弄清大麦早期黄苗的发生原因及其防治,我们对黄苗的发生发展,进行了试验和分析。黄苗的症状黄苗一般可分为两 Shortly after the winter of 1974, wheat germ appeared yellow in large area. According to the White Springs commune Venus, Wanqiang two brigade in mid-December investigation, yellow seedlings an area of ​​422 acres, accounting for 64% of the barley area, the period of early, large area, as rarely seen in history. In order to understand the causes of barley early emergence and its prevention and control, we carried out the experiment and analysis on the occurrence and development of yellow seedlings. Yellow seedlings symptoms generally can be divided into two yellow seedlings