Analysis of population dynamics and insect source of Agrotis ipsilon in Luohe,Henan province,from 2018 to 2022
To understand the population dynamics and the source of each generation of Agrotis ipsilon,we monitored the adult population systematically using insect forecasting light in Luohe,Henan Province,from 2018 to 2022.Additionally,the ovaries of female moths under the light were dissected.The results showed that the initial and final sighting dates of A.ipsilon in Luohe occurred in early and mid-March and mid-October,respectively.Four generations of adults(the overwintering generation,the 1st generation,the 2nd generation,and the 3rd generation)were observed over a year,with three generations being observed in some years.The 1st generation had the largest number of occurrences,accounting for 43.52％～62.39％of the annual population.The 2nd generation comprised 27.38％～48.57％of the total,while the overwintering generation and the 3rd generation accounted for 3.75％～19.44％and 0～0.94％,respectively.Two adult peaks were observed,accounting for 48.35％and 35.79％of the total,respectively.The first peak occurred from late May to late June,representing the 1st generation,while the second peak occurred from mid-July to mid-August,representing the 2nd generation.The overwintering generation of A.ipsilon was mainly an immigrant population,with a minor contribution from the local population.The source of the 1st generation varied significantly from year to year.The 2nd generation was primarily an immigrant population.This study provides a theoretical foundation for the prediction and control of A.ipsilon in Luohe and China.
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