陕西省汉中市2021年草地贪夜蛾监测调查及发生为害情况

Monitoring Investigations into the Occurrence of Spodoptera frugiperda in Hanzhong City,Shaanxi Province,in 2021

自2019年5月31日在陕西省汉中市发现新传入的重大迁飞性农业害虫草地贪夜蛾后,直至2021年6月22日又发现草地贪夜蛾,通过掌握汉中市草地贪夜蛾的迁入时间、发生情况、为害特点和规律,及时发现、处置,有效遏制草地贪夜蛾在汉中市的危害。2021年累计发生面积271.47 hm^(2),同比降低48.16%;平均百株虫量同比降低27.94%;平均被害株率同比降低48.01%。发生最重县区勉县与去年发生最重的西乡县同比降低5.93%,平均百株虫量同比降低42.68%,平均被害株率同比降低48.57%。通过调查,与去年相比危害情况已经降低,且在汉中市小麦地里未发现害状,主要以为害玉米为主。全市发现虫情的时间段和去年基本一致,主要集中于6月下旬至7月上旬。

On May 31,2019,Spodoptera frugiperda was first found in Hanzhong.On June 22,2021,it occurred in the city again.By grasping the time of migration,the occurrence of the situation,as well as the characteristics and laws of its harm,timely detection and disposal to reduce its harm were done.The cumulative area of its occurrence in 2021 was 271.47 hm^(2),with year-on-year decrease of 48.16%.The average number of larvae per 100 plants decreased by 27.94%.The average rate of damaged plants decreased 48.01%.Mianxian County,the worst affected county earlier,and Xixiang County,the worst affected county last year,saw a year-on-year decrease of 5.93%,with an average number of larvae per 100 plants reduced by 42.68%and the average rate of damaged plants reduced by 48.57%.The hazard situation last year had reduced compared to that of 2019.Also,no harmful condition was found in the wheat fields this time,meaning it mainly did harm to corns.The time period of the insect cases in the city this time was basically the same as that of 2019,which mainly concentrated in the time from late June to early July.