吉林省水稻二化螟发生动态研究

Study on the occurrence of the Chilo suppressalis in Jilin Province in China

2018-2020年,对吉林省不同水稻种植区水稻二化螟发生世代及发生动态进行了系统调查。结果显示,在中西部稻区白城市(洮北区)、扶余市和公主岭市二化螟一年可发生2代,性诱监测越冬代和第1代成虫发生高峰期分别在6月上、中旬和8月上、中旬。在中东部稻区的榆树市和吉林市(昌邑区),二化螟一年发生1~2代,榆树市在6月上、中旬和8月上、中旬,吉林市在6月中、下旬和8月中旬各有1个诱蛾高峰。在东南部稻区的柳河县和和龙市,二化螟1年发生1代,柳河县诱蛾高峰期在6月下旬到7月上旬,和龙市未发现明显诱蛾高峰。通过为害情况调查发现,水稻收获前2代区二化螟为害情况普遍重于1代区,应加强对2代区第2代二化螟的监测与防治。

To clarify the occurrence dynamics and generation distribution of Chilo suppressalis(Walker)in different areas in Jilin Province,we investigated the pupation and eclosion progress of overwintering generation as well as the occurrence of the adult of C.suppressalis systematically from 2018 to 2020.In Baicheng,Fuyu,and Gongzhuling,which are part of the mid-west rice planting area of Jinlin,two generations of C.suppressalis occurred per year,the adult emergence peak of overwintering generation occurred in early to mid-June,and that of the first generation was in early to mid-August.In Yushu and Jilin(Changyi)of central rice planting area,there were one to two generations of this pest each year,the adult emergence peaked in early to mid-June and early to mid-August in Yushu,in mid-to late June and mid-August in Jilin.Only one generation of C.suppressalis occurred annually in Liuhe and Helong of southeastern rice planting area,the adult emergence reached the peak during late June to early July in Liuhe.The occurrence of C.suppressalis in Helong was sporadic and no obvious emergence peak was observed.It was found that the damage of C.suppressalis in the twogeneration region was more severe than that in the one-generation region,so it was necessary to strengthen the control of the second generation of C.suppressalis.