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BmNPV (Bombyx mori nuclear polyhedrosis virus) causes nuclear polyhedrosis in silkworms. This paper reports on the relative susceptibility of silkworm pure breeds and their hybrids reared under BmNPV stress condition. Infection during fourth and fifth instar silkworm Bombyx mori L., with nuclear polyhedrosis virus caused reduction in larval weight and revealed significant results. However, maximum larval weight of 3.67 and 3.98g/10 was noticed in fourth instar inoculated batches (10^-1 and 10^-3) of CSR₂. Among hybrids, CSR₄xCSR₁₆ and CSR₂xCSR₄ have recorded (5.34 and 5.35 g/10) and (4.77 and 5.47g/10) compared to other hybrids. On the other hand, fourth instar inoculated batches of fifth instar also recorded maximum larval weight in CSR₂ (13.88 and 14.18g/10 and 11.68 and 11.74g/10). Further among hybrids of same instar inoculated, CSR₄xCSR₁₆ recorded (19.06 and 19.90g/10 and 20.21 and 21.63g/10) which was found maximum than other hybrids. Effective rate of rearing (ERR) of fourth instar inoculated batches were realized differently due to the administration of BmNPV. However, the maximum ERR (59.33 and 64.00%) and (62.00 and 62.00%) was recorded in PM which exhibited more survival percentage followed by CSR₄(58.67 and 56.00%) and (58.67 and 59.33%) compare to other two breeds. Among hybrids, PMxCSR₄ was recorded highest ERR (60.67 and 58.00%) and (58.67 and 57.33%) when administered with 10^-1 and 10^-3, respectively. The same trend has been noticed even in control lots. The results clearly indicated that, bivoltine breeds and their hybrids reflected low ERR percentage values inturn more sensitive to BmNPV stress.

Keywords

Larval Weight, ERR, BmNPV, Silkworm Breeds

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References

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