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小麦秕瘦除干热风等气候因素外,还由于蚜虫媒介而引起的黄矮病,加之土壤有效养分低,大部分土壤又极度缺磷所造成。小麦感黄矮病后苗期矮化丛生,严重者枯死;拔节期能孕穗,但结实较少;抽穗期功能叶衰竭。据近十年内病害流行的三年数字统计,1975年平均发病率83.4％,全县小麦减产3800万斤;1979年平均发病率13.43％,全县小麦减产1522万斤;1981年由于前期治蚜比较扎实,大部分社队的黄矮病仅为零星发生,发病率在15-75.5％
Wheat 秕 thin addition to dry hot air and other climatic factors, but also due to aphids caused by yellow dwarf disease, coupled with low effective nutrients in the soil, most of the soil caused by extreme phosphorus deficiency. Wheat dwarf disease after yellow dwarf disease dwarf clusters, severe cases dead; jointing booting, but less robust; functional failure of the leaf at heading. According to three years of epidemic disease statistics in recent ten years, the average incidence in 1975 was 83.4%. The wheat yield of the county was reduced by 38 million kg. In 1979, the average incidence was 13.43%. The yield of wheat in the county was reduced by 15.22 million kg. In 1981, More solid, most of the commune yellow dwarf disease is only sporadic, the incidence of 15-75.5%