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本文通过秋季和春季分别对１６个冬小麦品种接种，研究不同时期感染ＢＹＤＶ对小麦产量的影响，结果表明，无论秋季还是春季感染ＢＹＤＶ病毒，都对小麦的千粒重、产量、生物学产量有严重影响，秋季染病的小麦，其病情指数比春季感染的高出约一倍，感病越早，损失越严重。通过观察小麦黄矮病在田间的增长动态，认为小麦黄矮病在陇东旱塬的流行程度取决于秋季染病和春季染病的叠加结果
In this paper, 16 winter wheat cultivars were inoculated in autumn and spring respectively to study the effects of BYDV infection on wheat yield in different periods. The results showed that BYDV infection in autumn and spring had a serious impact on the 1000-grain weight, yield and biological yield of wheat, Autumn disease wheat, its disease index than the spring infection about doubled, the sooner the disease, the more serious the loss. By observing the growth dynamics of wheat yellow dwarf in the field, the prevalence of wheat yellow dwarf in the Longdong highland hinged on the superposition result of the autumn and spring diseases