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黄土高原产麦区包括陕甘宁三省(区)及晋西北,这个地区小麦大面积病害死亡历史久远,自1920年起小麦红矮病时有发生,至1959年的39年中,平均两年多流行一次。蔓延范围达70余县,1955年调查,“糜花”在陇东和渭北20余县发生,平均减产56％;“寸钵”在延安、榆林两地区普遍发生,57、60、67、68年大发生时,受害麦田达数万亩。六十年代以来,小麦黄矮病日趋严重,1966年,渭北20余县大发生,面积达600万亩。1970年波及陕、甘、宁三省区。1973年延安地区因病减产20—30％。1978、1980年陕、甘、宁、晋再度成灾,减产约2—3成。
The wheat-producing areas in the Loess Plateau include the three provinces (districts) of Shaanxi, Gansu and Ningxia provinces and the northwest of Shanxi Province. The area of wheat diseases in this area has a long history of death. The occurrence of red-dwarf wheat diseases has occurred from 1920 to 1939 and an average of two years More popular once. Spread over 70 counties, 1955 survey, “Pollock” occurred in Longdong and Weibei more than 20 counties, an average reduction of 56%; “inch bowl” in Yan’an, Yulin, the two areas generally occur, 57,60,67, When the disease took place in 68 years, it suffered tens of thousands of mu of harmed wheat fields. Since the 1960s, wheat yellow dwarf disease has become increasingly serious. In 1966, more than 20 counties in Weibei took place, with an area of 6 million mu. In 1970 spread to Shaanxi, Gansu and Ning provinces. Yan’an area in 1973 due to disease reduction 20-30%. In 1978 and 1980, Shaanxi, Gansu, Ningxia and Shanxi made another disaster and the output was reduced by about 2-3%.