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KMID : 0613820000100010001
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Journal of Life Science
2000 Volume.10 No. 1 p.1 ~ p.6
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Effects of Some Temperatures on Larval Development, Adult Longevity and Oviposition of the Beet Armyworm, Spodoptera exigua Hubner
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Abstract
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Larval development, adult longevity and oviposition of the beet armyworm, Spodoptera exigua H bner was studied at 16, 20, 25 and 30℃ with a 16L : 8D photoperiod. Egg hatchability of S. exigua was the highest at 30℃ and reduced with decreasing temperature. Egg period was the shortest at 30℃ and prolonged with decreasing temperature. Percent pupation was became higher at higher temperature form 23.2% to 94.0%. Developmental period of larva was the shortest at 30℃, but extended with decreasing temperature. Adult emergence ratio was the highest at 30℃ and reduced with decreasing temperature. The mean pupal period was 35.2, 14.4, 7.8 and 5.0 days at 16, 20, 25 and 30℃, respectively. Relationships between constant temperature and the developmental velocity of egg, larva and pupa were linear. Developmental threshold temperature seems to be 13.3 8℃ for egg, 14.02℃ for larva, 14.09℃ for pupa, and 13.84℃ for egg the adult. Estimated value of the total effective temperature for completing each stage was 36.89 day-degree for egg, 155.72 day-degree for larva, 79.20 day-degree for pupa, and 273.41 day-degree for egg to adult. Female longevity varied to temperature from 11.4 days at 16℃ to 5.8 days at 30℃, and male longevity was longer than that of female. Preoviposition period was the shortest at 30℃, but prolonged with decreasing temperature. It was about 2.7 times longer at 16℃ than that at 30℃. Number of eggs per female was the highest at 25℃, followed by 20, 30 and 16℃.
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