Effect of pH, rearing temperature and sunlight on infectivity of Malaysian isolate of nucleopolyhedrovirus to larvae of Spodoptera litura (Lepidoptera:Noctuidae)
The effects of pH, sunlight and rearing temperature on infectivity of nucleopolyhedrovirus (SpltNPV) were investigated against larvae of Spodoptera litura (Fabricius). The infectivity of virus increased with increased larval rearing temperature. The LT50 values were significantly reduced from 24...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Cambridge University Press
2007
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| Online Access: | http://psasir.upm.edu.my/id/eprint/7404/ http://dx.doi.org/10.1017/S1742758407824404 |
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| Institution: | Universiti Putra Malaysia |
| Language: | English |
| Summary: | The effects of pH, sunlight and rearing temperature on infectivity of
nucleopolyhedrovirus (SpltNPV) were investigated against larvae of Spodoptera litura
(Fabricius). The infectivity of virus increased with increased larval rearing temperature.
The LT50 values were significantly reduced from 24 to 6 days when rearing temperature
was increased from 20 to 35 8C. The pH of the substrate significantly affected the infectivity
of the virus. The LT50 values increased to about fourfold when the pH of suspension was
raised from 7 to 11. Infectivity of the virus was more adversely affected in alkaline than in
acidic suspension. Sunlight also deleteriously affected infectivity of the virus. The LT50
values increased with the increase in the period of sunlight exposure. A complete viral
inactivation occurred after 12 h of direct sunlight exposure. |
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