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大麦黄矮病(BYD)是小粒谷物一种重要的蚜传病毒病害,普遍发生在禾本科植物上。美国的小粒谷物曾于1907,1949,1959年发生过严重的BYD病流行。大多数年份该病均有不同程度的发生。1972,1973和1976年美国的冬小麦曾因此病受到严重损失。根据Gill报导,美国春小麦1978年因自然发病减产60—86%。冬小麦的BYD感病症状不如燕麦(Avenasatival)和大麦(Hordeum vulgare L.)明显。所以冬小麦的受病损失曾被认为不大严重。至今,还未能鉴定出抗BYD的小麦品种间存在的差异性。1972年以来,伊利诺斯州等地
Barley yellow dwarf disease (BYD) is an important aphid-borne disease of small grains, commonly occurring on grasses. The United States of small grain cereals had a severe epidemic of BYD in 1907, 1949, 1959. Most years the disease has varying degrees of occurrence. In 1972, 1973 and 1976, the winter wheat in the United States suffered serious illness. According to Gill, U.S. spring wheat cut 60-86% due to natural occurrence in 1978. The symptoms of BYD in winter wheat are not as pronounced as the Avena satival and Hordeum vulgare L. Therefore, the loss of winter wheat was considered less serious. To date, the differences between the wheat varieties resistant to BYD have not yet been identified. Since 1972, Illinois and other places