Effect of Ultraviolet radiation on Original Activity Remaining of Spodoptera littoralis NPV against S. littoralis Boisd (Lepidoptera: Noctuidae)

Document Type : Original Article

Authors

1 Pests and Plant Protection Department, National Research Centre, 33rd El Bohouth St, Dokki, Giza, Egypt.

2 Department of Entomology, Faculty of Science, Ain Shams University, Egypt.

Abstract

The cotton leafworm, Spodoptera littoralis (Boisd.) is a serious pest of cotton and other important plants in Egypt. The use of chemical insecticides caused environmental pollution. So that there is strong need to find other safer method than chemical pesticides for insect pest control such as entomopathogenic baculoviruses. The UV effect on Spodoptera littoralis Nuclear Polyhedrosis Virus was studied. The results indicated that exposure of the stock virus concentration (1.1 x 108 Polyhedral Inclusion Bodies per milliliter (PIB /ml)) to Ultraviolet (UV) for 5.0 and 20.0 minutes lead to decrease in the number of PIB/ml, where the PIB/ ml became 2.9x 106 and 6.125 x 105, respectively .These concentrations caused 50 % larval mortality after 18.72 and 21.88 days respectively, while the original non exposed concentration (1.1 x 108) caused 50 % larval mortality after 4.29 days. The results indicated that UV exposure decreased virus concentration, efficacy of virus and Original Activity Remaining. The irradiated virus activity decreased and the corresponding percentage of original activity remaining decreased. The results confirmed that applying the virus most is before sunrise and /or sunset. Also, it is necessary to use natural additives to protect the virus from UV radiation.

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Egyptian Journal of Chemistry
Volume 62, The First International Conference on Molecular Modeling and Spectroscopy 19-22 February, 2019
The First International Conference on Molecular Modeling and Spectroscopy 19-22 February, 2019
July 2019
Pages 173-178

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History

  • Receive Date: 10 May 2019
  • Revise Date: 23 June 2019
  • Accept Date: 01 July 2019

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