吉林省不同地区亚洲玉米螟发生世代的变化

为明确吉林省不同地区亚洲玉米螟发生世代的变化,对吉林省东部、中部和西部3个生态区28个县(市)的亚洲玉米螟成虫产卵时期、幼虫发育和化蛹等情况进行了系统调查。结果显示,东部生态区大部分地区亚洲玉米螟只有1个落卵高峰期,未发现第1代幼虫化蛹,仍为1代发生区,而在伊通县和集安市有部分幼虫化蛹,已由1代发生区变为1代为主兼1.5代发生区;中部生态区大部分地区有2个落卵高峰期,未发现第2代幼虫化蛹,已由1.5代发生区变为完全2代发生区,而在双辽市和梨树县出现第3代低龄幼虫,已变为2代为主兼2.5代发生区;西部生态区大部分地区有2个落卵高峰期,未发现第2代幼虫化蛹,仍为2代发生区,而在通榆县出现第3代低龄幼虫,已由2代发生区变为2代为主兼2.5代发生区。表明随着全球气候变暖,吉林省亚洲玉米螟的世代发生数有增加的趋势。

Generation distribution change of the Asian corn borer Ostrinia furnacalis (Guenée) in Jilin Province

To clarify the generation distribution changes of the Asian corn borer, Ostrinia furnacalis (Guenée), in different areas of Jilin Province, the adult oviposition period and larval development of O. furnacalis were systematically investigated in 28 counties in the eastern, central, and western ecoregions of Jilin Province. The results showed that the egg deposition period of eastern ecoregion had one peak period, and the generation number of eastern ecoregion was still one, while pupae were observed in Yitong and Ji'an, and the generation numbers of Yitong and Ji'an were one or one and a half; the egg deposition period of central ecoregion had two peak periods, and the generation number of central ecoregion had changed from one and a half to two, while the third generation larvae were observed in Shuangliao and Lishu, and the generation numbers of Shuangliao and Lishu were two or two and a half; the egg deposition period of western ecoregion had two peak periods, and the generation number of western ecoregion was still two, while the third generation larvae were observed in Tongyu, and the generation numbers of Tongyu were two or two and a half. The results indicated that the generation numbers of O. furnacalis in Jilin Province showed an increasing trend with global warming.