玉米螟有无远距离迁飞,未见过这方面的材料,晋南区有些情况好象有远距离迁飞现象存在,但又确定不了。因此,提出以下问题商榷,以供螟情测报参考。 一、夏玉米区第一代螟虫中间寄主问题 六十年代初在运城以西的永济等县观察,发现5月中下旬越冬代蛹开始羽化。当地基本上不种春玉米等春播寄主作物,夏播玉米到7月中旬才能长一尺来高,免强接受螟虫为害。此时为害玉米的肯定不是当地第一代螟虫,从越冬代羽化到此时,中间相隔约两个月的时间,第一 Corn borer without any long-distance migration, have not seen this material, some cases in Jinnan District seem to have the phenomenon of long-distance migration, but not sure. Therefore, the following questions are put forward for reference. First, the first generation of summer corn borer host the problem of intermediate host In the early 1960s in Yuncheng west of Yongji County and other observations, found in mid-to late May overwintering generation of pupae emergence. Basically, the local spring crops such as spring maize host crops, summer sowing corn to mid-July to grow one foot tall, strong to accept stem borer damage. At this point the corn is certainly not the first generation of local stem borers, feathering from the wintering to this time, the middle of about two months time, the first