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二点委夜蛾Proxenus lepigone(Moschler),属鳞翅目夜蛾科,主要分布于日本、朝鲜、俄罗斯和欧洲等地。我国于2005年7月在河北省夏玉米田首次发现。近年来,该虫发生范围不断扩大,为害程度日益加重。2011年二点委夜蛾在我国夏玉米产区严重暴发,虫情涉及6省47市302个区(县),面积近220万hm2。山东省2007年首次在德州市发现该虫为害玉米,2011年全省17个地市普遍为害严重。为更准确地确定该虫的发生代次、每代各虫态发生历期、发生盛期、发生高峰日等信息,适时准确监控发生时期,本文采用symlets小波函数变换滤除高频信息,对山东省多地点二点委夜蛾成虫诱虫数据进行分析,结果显示,二点委夜蛾在山东省一年发生4代,越冬代、1代、2代、3代,始见蛾日在3月底—4月上旬,越冬代成虫发生期在3月底至4月上中旬,1代发生期在4月上旬至6月中下旬,2代发生期在6月中旬至8月上中旬,3代发生期在8月上旬至9月中下旬,越冬代幼虫发生期在9月中旬至10月中下旬,10月下旬左右老熟幼虫做茧越冬。另外,通过调查和室内观察还发现高温环境不利于二点委夜蛾幼虫生长发育,7—8月份高温期,成虫致畸率较高。
Proxenus lepigone (Moschler) is a member of the family Lepidoptera, which is mainly distributed in Japan, North Korea, Russia and Europe. Our country was found for the first time in summer corn field of Hebei Province in July 2005. In recent years, the scope of the insect has been expanding, increasing the degree of harm. In 2011, two members of the armyworm were seriously outbreaks in the summer maize producing areas of China. Insects involved 302 districts (counties) in 47 provinces and 6 provinces, covering an area of nearly 2.2 million hm2. Shandong Province, the first time in 2007 in Texas found that the pest-damaging corn, the province’s 17 cities in 2011 were generally devastating. In order to more accurately determine the occurrence of the pest generation, each generation of each pest occurrence period, the occurrence of peak, peak and other information occurs, timely and accurate monitoring of the occurrence period, the paper uses symlets wavelet function to filter out high frequency information, In Shandong Province, the data of insect louse infestation were analyzed. The results showed that the second instar larvae occurred in Shandong Province in the fourth generation, overwintering generation, first generation, second generation and third generation, From the end of March to the beginning of April, the overwintering generation adults occur from the end of March to the middle of April, the first generation occurs from early April to late June, the second generation occurs from mid June to mid-August, and 3 Occurred in the period from early August to late September, the overwintering larvae occurred in mid-September to mid-October and late October, about late mature cocoon larvae overwinter. In addition, the investigation and laboratory observations also found that the high temperature environment is not conducive to the development of larvae of the Spodoptera exigua development, high temperature period from July to August, adult teratogenic rate higher.