一、土传麦类病毒病的发生情况土传麦类病毒病实际上是真菌或线虫等介体传播的病毒病。分布于美国、加拿大、中国、日本、泰国、意大利、英国、德国、苏联等。小麦梭斑花叶病在加拿大,小麦土传花叶病在日本和美国,大麦黄花叶病在日本等地的流行曾相当严重。有人认为这类病害在流行上的重要性仅次于蚜虫所传的病毒病。国内五十年代初有些地区就注意到这类病毒病的发生,六十年代末至七十年代初多见于良种繁育场和群众的自留田,当时并不认为是病毒病,许多人把它当成生理病或品种特性,如大麦黄花叶病就是一例。以后随着一些感病品种(特别是早熟3号的推广)在这 First, the earth-borne wheat virus disease occurs soil transmitted wheat virus disease is actually fungi or nematodes and other media transmitted virus disease. Distributed in the United States, Canada, China, Japan, Thailand, Italy, Britain, Germany, the Soviet Union and so on. Wheat shuttle leaf mosaic disease In Canada, wheat soil mosaic disease in Japan and the United States, yellow barley disease in Japan and other places in the epidemic has been quite serious. Some people think that the importance of such diseases in the epidemic is second only to the virus transmitted by aphids. In some areas of China in the early 1950s, the occurrence of such virus diseases was noticed. In the late 1960s and early 1970s, most of the self-sustaining fields of breeding farms and the masses were not considered virus diseases. Many people regarded it as Physiological or breed characteristics such as barley yellow mosaic disease is one example. Later with some susceptible varieties (especially the promotion of precocious 3) in this