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二点委夜蛾[Athetis lepigone(Mschler)]是2005年河北省首次发现报道的夏玉米苗期的新害虫,危害日趋严重。本文通过分析近年来对二点委夜蛾成虫的监测数据,研究其发生世代。结果表明:二点委夜蛾在河北省每年发生4代。4-5月为越冬代成虫期,6-7月上旬为1代成虫期,7月中旬-8月上旬为2代成虫期,8月中旬-9月下旬为3代成虫期。其中1～2代成虫蛾量大,蛾峰明显,以第2代幼虫为害玉米苗最为严重,越冬代成虫和第3代成虫蛾量较少,蛾峰不太明显。
Athetis lepigone (Mschler) was the first new pest of summer maize to be reported in Hebei Province in 2005, and its harm was becoming more and more serious. In this paper, through the analysis of the monitoring data of adult worms of the second instar Spodoptera exigua in recent years, we study their generation. The results showed that the 2nd instar larvae occurred in Hebei Province every 4 generations. April to May for the overwintering generation adult period, early June-July for the first generation of adult period, mid-July to early August for the second generation of adult period, mid-August to late September for the third generation of adult period. Among them, 1 ~ 2 generations of moths had large amount of moths and obvious moths. The maize seedlings were most affected by the 2nd generation larvae, while there were less moths in the overwintering adults and 3rd generation adults, and the moths were not obvious.