【摘要】 2012年~2014年在沈阳地区进行美国白蛾发生规律研究的结果表明,美国白蛾在沈阳1年发生2代,第1代幼虫期为5月下旬至7月中旬,第2代成虫期为7月中旬至8月中旬,卵期7月下旬至8月中旬,幼虫期8月上旬至9月下旬,蛹期9月中旬至次年4月下旬至5月上旬。美国白蛾虫态有重叠现象,1~2代历期不等,第2代成虫产卵期较之第1代明显变短,而幼虫期和蛹期又明显较之第1代变长。更多还原

【Abstract】 Occurrence regular pattern of fall webworm were studied in Shenyang region from 2012 to2014. The result showed that fall webworm occur two generations a year in Shenyang. The first generation larvae begins to see a period of late May to early July. The second generation of adults begins to see in mid- July to mid- August. The egg stage was seen in late July to mid- August and the larval stage appeared in mid- August to early October. The pupal stage were from late September early to late April or May of next year. The instars of fall webworm have phenomenon of overlap. The insect 1 ~ 2generations life period were Unequal,The two generations oviposition period was shorter and larval and pupal period is significantly longer than the generation one. we learn the occurrence and provide the basis for early prevention.更多还原