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KMID : 1041219970390020140
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Journal of Sericultural and Entomological Science
1997 Volume.39 No. 2 p.140 ~ p.145
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Effects of Insect Growth Regurators on Developmental Physiology of the Silkworm, Bombyx mori L.
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황석조/Hwang, Seok Jo
손해룡/마영일/장승종/황재삼/Shon, Hae Ryong/Mah, Young Il/Chang, Seong Jong/Hwang, Jae Sam
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Abstract
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Silkworm fed on mulberry leaves with 1000 times diluted Insegar(main component : Fenoxycarb, ethyl-2-(4-phenoxyphenoxy)ethylcarbmate) and its effect was investigated on increase of the 5th larval silkland weight and silk quality. The oral application of fenoxycarb showed increase of the silkland weight. The whole period of the silkland weight falls on the2nd instar treatment by 13%, the 3rd day of the 4th instar by 111%(3100 mg) and the whole period of the 5th instar treatment rather decreased it by 66%(497 mg), as compared to 1470mg of the control. Female and male both increased 15% (1779 mg) and 12% (1554 mg) of the silkland weight with the 2nd instar treatment, as compared to 1548 mg and 1391 mg in control, respectivey. 118% (3368 mg) and 104% (2832 mg) of increase in the silkland weight were also showed with the 3rd day of the 4th instar treatment but 70% (463 mg) and 61% (539mg) of decrease were shown with the 5th instar treatment. The maximum weight of the middle silkland weight increased by 6% (1248 mg) and 127% (2673 mg) with the 2nd instar and with the 3rd day of the 4th instar, respectively but 67%(393 mg) of decrease took place, as compared to 1175 mg of the control. The maximum increase of the posterior silkland weight with whole period of the 2nd instar treatment increased 12% (419 mg) and 75% (656 mg) and 64%(135 mg) of decrease was shown, as compared to 374 mg of the control. The oral application of Insegar at the 2nd instar increased 26 m of cocoon length, 4.0 cg of the cocoon filament weight and 0.21d of the silk denier, as compared to 1147 m of the cocoon length, 38cg of the cocoon filament, 2.994 of the silk denier, weight of cocoon filament and silk denier, respectively but denier variance narrowed to 0.334, as compared to that of the control.
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