河南省小麦叶枯类病害研究现状＊王锡锋刘红彦张忠山（河南省农业科学院植保所郑州４５０００２）小麦叶枯类病害７０年代仅在河南省局部地区零星发生，８０年代初因大面积推广阿夫系统小麦和生产条件改变，发病面积逐年增加，８０年代中期已遍及全省大部分麦区。１９９... Research Status of Wheat Leaf Blight Disease in Henan Province  WANG Xi-feng LIU Hong-yan ZHANG Zhong-shan (Plant Protection Institute of Henan Academy of Agricultural Sciences, Zhengzhou 450002) Wheat leaf blight disease occurred sporadically only in some areas of Henan Province in the 1970s. In the early 1980s, System of wheat and production conditions change, the incidence of area increased year by year, the mid-80s has covered most of the province wheat area. 199 ...