小麦丛矮病是一种由灰飞虱传播的病毒病害,它的发生、发展与灰飞虱的活动、消长有密切的联系。我们发现:凡是播种早的,在前茬玉米行间套种的,以及靠近沟渠、苗圃、菜地和杂草的麦田发病都严重。另外,染病麦田地边比地中间发病重。染病植株分蘖无限增加,叶片稍短而细弱,新叶上有与叶脉平行、黄绿相间的条纹。早期染病的植株多数不能越冬,晚播染病的虽可越冬,但不能拔节抽穗,或者只主茎抽一小穗。分蘖在抽穗 The bushy dwarf disease of wheat is a virus disease transmitted by the Laodelphax striatellus and its occurrence and development are closely linked with the activities of the Laodelphax striatellus. We found that wheat fields that were planted early and were interplanted between the previous rows of maize and near ditches, nurseries, vegetable fields, and weeds were all severely affected. In addition, the incidence of sick wheat field than the middle of the serious disease. Infected plants tillers increased indefinitely, the leaves slightly shorter and weaker, new leaves and veins parallel, yellow-green and white stripes. Most of the early infected plants can not wintering, although the late-sowing disease can wintering, but can not jointing or heading, or only a small spike stem pumping. Tillers at heading