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Reproduction of the beet armyworm spodoptera exigua huebner lepidoptera noctuidae and influence of delayed mating



Reproduction of the beet armyworm spodoptera exigua huebner lepidoptera noctuidae and influence of delayed mating



Japanese Journal of Applied Entomology & Zoology 34(1): 43-48



Fertilized females of Spodoptera exigua laid 713 .+-. 154 eggs (mean .+-. S.D.) for 4.8 .+-. 1.5 days in the laboratory at 25.degree. C and 14L:10D. They laid ca. 40% of the eggs during the first night after mating, and the daily oviposition diminished exponentially thereafter. In contrast, unmated females laid 371 .+-. 175 eggs for 5.3 .+-. 2.2 days. mating delay for more than 4 days after emergence resulted in fewer eggs and less hatchability. Simulation showed that ca. 97% of daily inhibition of mating would result in a ca. 20% accumulated mating rate of females. This value would be necessary to exceed a 90% reduction of production. This etimation coincided with the population suppression effects observed in a field experiment of communication disruption conducted in 1987 by Wakamura et al. (1989).

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Accession: 007746940

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DOI: 10.1303/jjaez.34.43


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