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1970年前后,日本的麦类种植面积减少到15万公顷,后来由于日本政府采取了一系列措施,1978年以后再次增长,现已恢复到53万公顷。但在种植面积增加的同时,大麦黄花叶病在全国普遍发生。该病防治困难,成了麦类生产的重大障碍。黄花叶病是从大正年间开始发生的,近年来,由于利用大型机械进行病土的耕翻以及连续种植加工部门指定生产的感病品种等原因,危害日益加重。
Since 1970, the area under wheat planted in Japan has been reduced to 150,000 hectares. Since then, the Japanese government has taken a series of measures and then increased again after 1978, now returning to 530,000 hectares. However, at the same time as the acreage increased, barley yellow mosaic disease occurred in the whole country. The prevention and treatment of the disease has become a major obstacle to wheat production. Yellow mosaic disease has occurred since the beginning of the Taisho era. In recent years, the damage has been aggravated by the use of large-scale machinery for tampering with soil and soil, as well as susceptible varieties designated by the continuous planting and processing department.