玉米矮花叶病(MDMV)是世界各地普遍发生的一种禾谷类病毒病。它在我国的分布也非常广泛,从南到北,从东到西,都有不同程度的发生。有些地区发病相当严重,在生产上造成较大的损失。如1968年河南省新乡地区此病大流行,仅获嘉和辉县就损失玉米2,200万斤。七十年代初期,我省仅在少数县、市发生,目前已遍及全省各地,其中尤以 Maize dwarf mosaic disease (MDMV) is a cereal disease commonly found in many parts of the world. It is also widely distributed in our country, from south to north, from east to west, have varying degrees of occurrence. In some areas, the incidence is rather serious, causing a big loss in production. For example, in 1968, the disease pandemic in Xinxiang, Henan Province, 2,200 kilograms of corn was lost to Jiahehui County alone. In the early 1970s, our province only occurred in a few counties and cities, and now it has spread all over the province, especially