黄早四系统的自交系是河北省玉米杂交制种的骨干亲本，具有亲本配合力好，抗病毒病、锈病和大小斑病等特点。但近年来在抽雄、吐丝期（７月下旬至８月中旬）严重感染玉米黄斑病（Ｃｕｒｖｕｌａｒｉａｌｕｎａｔａ（Ｗａｌｋ）Ｂｏｅｄ．）。病株授粉后叶片布满病斑，提前... Huangzao four-line inbred lines are the main parents of maize hybrids in Hebei Province. They have good combining ability, anti-virus, rust and spot-spot disease. In recent years, however, Curvularialunata (Walk) Boed. Has been severely infected in the tasseling and silking stages (from late July to mid-August). Strain after pollination leaves covered with lesions, in advance ...