玉米自交系8112具有配合力高、株型紧凑、产量高等优良性状,是掖单四号等玉米杂交种的亲本之一。但近年在应用其繁种、制种时,常常出现大面积早期枯死现象,产量损失严重。如1989～1990年衡水和石家庄地区几万亩制种田严重减产,不少地块甚至绝收。1990年卢龙、抚宁等县制种田8112出现大面积早衰。为弄清8112早枯及减产的原因,在河北省不同玉米生态区设立病圃进行了玉米大小斑病、丝黑穗病和矮花叶病毒的接种鉴定及玉米青枯病、粗缩病病区自然发病鉴定。并做 Maize inbred line 8112 has the characteristics of high combining ability, compact plant type and high yield. It is one of the parents of Yedan No.4 maize hybrid. However, in recent years, its application in breeding species, seed production, often appear large areas of early dead phenomenon, yield loss serious. Such as the 1989 ~ 1990 Hengshui and Shijiazhuang tens of thousands of acres of serious decline in production of farming, and even a lot of plots even absolutely. In 1990 Lulong, Funing and other county farming 8112 appeared large area of ​​premature aging. In order to find out the reasons for the early withered and reduced yield of 8112, maize leaf spot, head smut and short mosaic virus were inoculated and identified in different nursery ecotopes in Hebei Province, and corn bacterial wilt, District natural disease appraisal. And do it