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KMID : 1041219870290020044
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Journal of Sericultural and Entomological Science
1987 Volume.29 No. 2 p.44 ~ p.50
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Inhibitory Effect of High Temperature on the Multiplication of Flacherie Virus in the Silkworm, Bombyx mori L.
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Abstract
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The silkworms were inoculated with flacherie virus and reserved at high temperature (37°C) to find out the effect of high temperature on the multiplication of the virus in silkworms. The obtained results are summarized as follows.
1. It was shown that the inhibitory effect of high temperature treatment on the virus multiplication was achieved at high level at the newly molted stages in 5th instar larvae and both in 4th and in 5th larvae.
2. Twelve hours treatment and 24 hours treatment showed high inhibitory effect on the multiplication of flacherie virus.
3. The silkworms were inoculated with flacherie virus at the newly molted stage in 2nd instar larvae and followed by high temperature (37°C) treatment at the newly molted stages in 5th instar and both in 4th and in 5th instar for 12 and 24 hours respectively. The increase in the survival rate with high temperature treatment ranged from 33.8 to 39.5 percent in index number and cocoon production was also increased by 24.2 to 32.6 percent compared to non-treatment.
4. The same tendency was also shown in the virus inoculation to newly molted larvae of 3rd instar and followed by high temperature treatment at the same stages as the above. In this treatment, the survival rate was increased by 53.6 to 70.0 percent in index number and the increase in cocoon production was 45.8 to 54.2 percent compared to non·treatment.
5. In the inoculation of the virus to the 4th instar larvae, the high temperature treatment at the newly molted stage in 5th instar brought increases in the survival rate from 49.7 to 68.9 percent in index number and in cocoon production from 44.3 to 69.0 percent.
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