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KMID : 1041219760180020083
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Journal of Sericultural and Entomological Science
1976 Volume.18 No. 2 p.83 ~ p.88
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Interstrain Difference in the Resistance of the Silkworm, Bombyx mori,. to Peroral Infection and Induction with the Two Strains of Cytoplasmic Polyhedrosis Virus
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Lim Jong-Sung
Kim Keun-Young
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Abstract
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A study was made on the interstrain difference in dose-infection response and induction response of silkworm to the two strains of cytoplasmic polyhedrosis virus to obtain some informations on screening the leading strains. Comparison of dose-infection responses of larvae following the inoculation of the inclusion body of cytoplasmic polyhedrosis virus revealed that there is no significance in the resistance to dose-infection and any of strains were more resistant at advanced stage(4th instar) than younger stage(2nd instar). In the pathogenicity between cytoplasmic polyhedrosis virus with hexagonal and tetragonal outline, the hexagonal polyhedra showed higher pathogenicity than the tetragonal polyhedra. However, the averages of of cytoplasmic polyhedrosis virus with hexagonal outline to larvae of parental inbred line were 6.12106// at 2nd instar and 1.57107// at 4th instar in spring and those to their hybrids were 1.28106// at 2nd ins tar and 4.99106// at 4th ins tar in autumn. Meanwhile the averages of tetragonal polyhedra. to larvae of parental inbred line were 2.06107// at 2nd instar and 5.67107// at 4th instar in spring and those to their hybrids were 9.84106// at 2nd instar and 3.86107// at 4th instar in autumn, respectively. In comparison of induction response of silkworm larvae to inoculation of tetragonal polyhedra of cytoplasmic polyhedrosis virus, the induction rate of hexagonal polyhedra was remarkably higher in the treatment of inoculation at 2nd instar than at 4th instar and at the concentration of 1.3106// than at any others. Most of induction showed a mixed infection with hexagonal and tetragonal polyhedra of cytoplasmic polyhedrosis virus.
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