河西走廊玉米螟发生规律研究

Study on the Occurrence Pattern of Corn Borer in Hexi Corridor

为明确玉米螟在河西走廊地区的寄主种类、危害程度以及发育历期,采用田间调查和室内饲养相结合的方法,对玉米螟的发生规律进行研究.结果表明:玉米螟在河西走廊地区的寄主要有制种玉米、大田玉米、高粱、棉花、蓖麻、向日葵、白菜等,其中制种玉米、大田玉米和棉花的危害程度较重,虫株率分别达到18.5%、15.27%和12.4%;玉米螟在河西走廊一年发生两代,且不同寄主的玉米螟幼虫期无明显差异,制种玉米饲养的蛹期最长,蓖麻饲养的蛹期最短.

In order to clarify the host species,the degree of harm,and the developmental period of the corn borer in the Hexi Corridor area,a combination of field investigation and indoor breeding was used to study the occurrence of corn borer.The results showed that the main distribution of corn borer in the Hexi Corridor area was seed corn,field corn,sorghum,cotton,castor,sunflower,cabbage,etc.Among them,seed corn,field corn,and cotton were more harmful,and the plant rate was higher.It reached 18.5%,15.27%,and 12.4%respectively;the corn borer occurred two generations a year in the Hexi Corridor,and there were no significant differences in the larval stages of the corn borer from different hosts.The breeding period for breeding corn is the longest,and the breeding period for castor is the shortest.