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我区永寿、彬县、长武、旬邑、淳化及乾县的北山区是春玉米地区,常年种植面积46万亩以上。1977年以前,主要推广陕单1号、黄白单交、白单4号及陕玉661等杂交种,在生产上起了很大作用。近年来这些品种普遍感染丝黑穗病,一般染病株率为15%左右,严重的达40—50%,估计每年损失粮食2000万斤以上,对生产威胁很大。为了解决这问题,病区各县先后曾引进许多品种进行试验。1977年选中单2号(莫17×330)在
The Yongsishou, Binxian, Changwu, Xunyi, Chunhua and Qianxian Beishan areas are spring maize areas with annual perennial planting area of more than 46 mu. Before 1977, it mainly promoted the hybrid varieties such as Shandan 1, Huangbailiaojiao, Baidan 4 and Shanyu 661, which played a great role in the production. In recent years, these varieties are generally infected with head smut. Generally, the rate of infected plants is about 15% and the severity is 40-50%. It is estimated that the annual loss of more than 20 million pounds of food will threaten the production. In order to solve this problem, the ward counties have successively introduced many varieties to carry out experiments. Selected in 1977 No. 2 (Mo 17 × 330) in