Pathogenicity of Spodoptera Litura Nuclear Polyhedrosis Virus to S. Litura F. Larvae and its Impact on Sycanus Leucomesus W.
Spodoptera litura Fabricius (Lepidoptera: Noctuidae) is a pest of many agriculture and forestry crops in several parts of the world including Malaysia. One of the natural enemies responsible for regulating field population of S. litura is a nuclear polyhedrosis virus (NPV). In this study, the S....
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| Format: | Thesis |
| Language: | English English |
| Published: |
1994
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9910/1/FH_1994_1_A.pdf |
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| Summary: | Spodoptera litura Fabricius (Lepidoptera: Noctuidae) is a pest of many
agriculture and forestry crops in several parts of the world including Malaysia.
One of the natural enemies responsible for regulating field population of S.
litura is a nuclear polyhedrosis virus (NPV).
In this study, the S. filura NPV was tested for its actual pathogenicity to
S. Litura larvae using eight viral doses ranging from 60 to 6 X 10⁸ PIBs/larva.
The result of bioassay shows that LD50 LD90 and LD99 was 5.50 x 10⁴, 5.26
X 10⁸ and 9.26 x 10¹¹ PIBs/larva, respectively. The regression equation, Y =
3.47 + 0.32X , indicates that an increase of larval mortality was due to an
increase in viral doses. The LT of the doses was eight, six and five days,
respectively, with a regression equation of Y = 13.59 - 9.41X. |
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