一、发病情况及规律。我县北部干旱川区的马岭、卅铺、城关三个社镇,历来是冬小麦红矮病易发和常发区。1976年该地冬小麦发生红矮病四万多亩,约占播种面积的40％;1977年发病28770亩,占27％。1976年发病最严重的马岭公社有60％的冬小麦亩产仅80多斤,其中绝苗和改种10700亩;1977年小麦发病面积占57％,其中1万亩有60％不抽穗或抽穗不结实。1981年12月份调查,三个社、镇平均每平方米有传播冬麦红矮病毒的媒介——叶跳蝉越 First, the incidence and laws. My county northern arid zone Maling, Hsuehpo, Chengguan three community town, has always been the winter wheat dwarf disease prone and frequent areas. In 1976, 40,000 mu of red dwarf disease occurred in winter wheat in the area, accounting for 40% of the sown area. In 1977, 28,770 mu of muck occurred, accounting for 27% of the total. In 1976, the most serious Maling commune has 60% of winter wheat per mu yield of only 80 kilos, of which 10 million are seedlings and replanting crops. In 1977, the area affected by wheat accounted for 57%, of which 60% of 10,000 mu had no heading or heading Not strong. December 1981 survey, three communities, the town has an average per square meter spread of winter wheat dwarf virus vector - leaves jump cicada