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Issue:ISSN 2095-1353
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Your Position :Home->Past Journals Catalog->2017年54 No.3

Effect of maternal sex ratio on the reproductive potentials of the beet armyworm, Spodoptera exigua
Author of the article:WANG Si-Fang1** ZHOU Qian1** ZHANG Xue1 WAN Fang-Hao1, 2 ZHANG Bin1***
Author's Workplace:1. Key Laboratory of Integrated Crop Pest Management of Shandong Province, College of Agronomy and Plant Protection, Qingdao Agricultural University, Qingdao 266109, China; 2. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Key Words:Spodoptera exigua, sex ratio, fecundity, hatching rate, oviposition duration
Abstract:

[Objectives]  To understand the effects of sex ratio on the reproduction and population dynamics of Spodoptera exigua, and thereby improve our ability to forecast outbreaks of this pest. [Methods]  Reproductive parameters were studied under different sex ratios (♀♂=11; 12; 13) under laboratory conditions (temperature (28±1)℃, RH 70%±5%, photoperiod 16 L8 D). [Results]  Sex ratio had an obvious impact on reproductive parameters. Although the oviposition duration of females reduced as the sex ratio declined the hatching rate increased. Although female egg production did not differ significantly among the three different sex ratio groups, the contribution of males to the next generation increased rapidly as the proportion of females increased. Offspring sex ratio and female pupa weight tended to increase with declining parental sex ratio. [Conclusion]  Sex ratio had little influence on the reproductive capacity of individual female adults, but did have a significant influence on the oviposition duration of females and male reproduction. Therefore, short-term forecasts based on the number of male S. exigua lured into traps by sex attractants should also take into account the population sex ratio.

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