夏播玉米自交系繁殖田和杂交种制种田,每年都有程度不同的发生烂种、僵苗和死苗现象。发生重的年份会造成大面积严重缺苗,使繁、制种减产严重。1986年沂南、肥城、枣庄等地,1988年临沂市、郯城、栖霞等地,因其发生严重,大面积制种田翻种成其他作物,制种计划落空,同时给制种基地农民造成经济损失。这种病害是夏播玉米繁、制种工作的一大威胁。 Summer sowing corn inbred lines and hybrids to breed farming, the degree of occurrence of different degrees each year rotten, stiff and dead seedling phenomenon. Occurred heavy years will result in serious shortage of large areas of seedlings, so that the complex, severely cut production. 1986 Yinan, Feicheng, Zaozhuang and other places. In 1988, Linyi City, Gaocheng City and Qixia and other places were seriously planted and turned into other crops in large-scale farming systems. loss. This disease is a big threat to the summer sowing of corn and seed production.