河南原阳东方粘虫和劳氏粘虫发生动态与虫源性质分析

Dynamics and population characteristics of Mythimna separata and Mythimna loreyi in Yuanyang,Henan province

【目的】了解粘虫在河南原阳的发生规律和虫源性质,为预测预报和综合防控提供参考。【方法】利用虫情测报灯对河南原阳2020-2021年东方粘虫Mythimnaseparata和劳氏粘虫Mythimnaloreyi进行持续监测及种群动态分析,并对2018-2021年2种粘虫各代的虫源性质进行分析。【结果】2020年东方粘虫以第2代为主(占全年总诱虫量的52.95%),2021年以第1代为主(占全年总诱虫量的81.42%);监测期间劳氏粘虫均以第3代为主,分别占全年总诱虫量的46.27%和43.10%。雌蛾卵巢解剖的结果表明,东方粘虫第1代(2019年除外)和第3代(2020年除外)成虫中卵巢发育低级别(Ⅰ-Ⅱ级)所占比例较高,说明该代成虫以向外迁出为主,第2代成虫卵巢发育高级别(Ⅲ-Ⅴ级)所占比例较高,以留在当地为主(2020年除外)。劳氏粘虫各代成虫卵巢发育低级别的比例均较低(低于25.00%),各代成虫均以留在本地为主。【结论】河南原阳东方粘虫和劳氏粘虫的种群发生动态和虫源性质存在明显差异。

[Objectives]In order to understand the occurrence regularity of two armyworms in Yuanyang,Henan province,provide reference for the prediction and scientific control.[Methods]Mythimna separata and Mythimna loreyi were monitored using monitoring lamp from 2020 to 2021,and the population characteristics of them were analyzed from 2018 to 2021.[Results]The results showed that the 2nd generation of M.separata was the main generation in 2020(accounting for 52.95%of the total number),while the 1st generation was the main generation in 2021(accounting for 81.42%of the total number).The 3rd generation of M.loreyi was the main generation in 2020-2021,accounting for 46.27%and 43.10%of the total number,respectively.The results of ovarian anatomy of female moths showed that the low level proportion(grade I-II)in the 1st generation(except 2019)and the 3rd generation(except 2020)of M.separata were high,indicating that these adults mainly migrated outward.The high level proportion(gradeⅢ-Ⅴ)in the 2nd generation was high,indicating that these adults mainly stayed locally(except 2020).The low level proportion in each generation of M.loreyi was low(less than 25.00%),indicating that each generation was mainly left in the local area.[Conclusion]There were obvious differences in dynamics and population characteristics between M.separata and M.loreyi in Yuanyang,Henan province.