Pathogenicity of Spodoptera Litura Nuclear Polyhedrosis Virus to S. Litura F. Larvae and its Impact on Sycanus Leucomesus W.
James, Rubinsin Kotulai (1994) Pathogenicity of Spodoptera Litura Nuclear Polyhedrosis Virus to S. Litura F. Larvae and its Impact on Sycanus Leucomesus W. Masters thesis, Universiti Pertanian Malaysia.
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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