Simulation of the competition between Spodoptera frugiperda and Mythimna separata indoors

doi:10.14088/j.cnki.issn0439-8114.2022.06.011

Abstract

Abstract: The objective was to study the competitive behaviors of larvae of Spodoptera frugiperda and Mythimna separata with different initial newly hatched larvae population densities （50 Spodoptera frugiperda+50 Mythimna separata; 25 Spodoptera frugiperda+50 Mythimna separata; 10 Spodoptera frugiperda+50 Mythimna separata） when they appeared simultaneously on the same plant, and analyzed the causes of the competitive behavior. When 50 newly hatched larvae of Spodoptera frugiperda and Mythimna separata were transferred to the wheat seedlings at the same time, the larvae survival rate of Mythimna separata was 0 after mixing 13 days, while that of Spodoptera frugiperda was 51.0%. The survival rate of Mythimna separata in the other two treatments gradually increased after mixing 13 days with the decrease of the proportion of Spodoptera frugiperda in the initial mixed population, and the two groups reached coexistence finally. When 50 newly hatched larvae of Spodoptera frugiperda and Mythimna separata were transferred to the maize seedlings at the same time, the larvae survival rate of Mythimna separata was 0 after mixing 10 days, while that of Spodoptera frugiperda was 81.0%. Mythimna separata could not complete the larval period after mixing 13 days in the other two treatments with the decrease of the proportion of Spodoptera frugiperda in the initial mixed population, and the two groups couldn't reach coexistence finally. Spodoptera frugiperda had a significant competition advantage when they were in same ecological niche. Whether the host was wheat or maize, the daily survival rate of Mythimna separata in the mixed population was usually lower than that of Spodoptera frugiperda and Mythimna separata raised alone, or even Mythimna separata couldn't complete the larval development, resulting in the very possible displacement by Spodoptera frugiperda.

Key words: invasive organisms, Spodoptera frugiperda, Mythimna separata, wheat, maize

CLC Number:

S435.1

CHANG Xiang-qian, LYU Liang, XU Dong, WAN Peng, ZHANG Shu, SU Hai-yan. Simulation of the competition between Spodoptera frugiperda and Mythimna separata indoors[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(6): 61-65.

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