玉米二点委夜蛾是北方夏季玉米生产中新发生的一种虫害,从2005年只有河北省发生,到2011年发生区域扩大到山西、山东、河南、安徽等地,在河北省衡水市桃城区,玉米二点委夜蛾是2008年有个别地方发生,到2011年发生面积达18.1万亩;有1500亩发生比较严重,有300亩发生的地块造成60—80%玉米苗受伤害,需要补种或改种。通过2011年对二点委夜蛾发生特点调 The second instar larvae of corn is a new pest occurred in the summer maize production in the north. From 2005, only the occurrence of pests occurred in Hebei Province. In 2011, the area expanded to Shanxi, Shandong, Henan and Anhui. In 2011, In urban areas, the two-spotted night-stage moths of maize occurred in some places in 2008, with an area of ​​181,000 mu in 2011; more serious cases occurred in 1,500 mu and 60-80% of corn seedlings were harmed by the land with 300 mu, Need to replant or replant. By 2011 on the second generation of the night moth characteristics of tune