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Lethal And Sublethal Effets Of Bacillus Thuringiensis Var. Kurstaki On Larvae Of The Cotton Leafworm Spodoptera Littoralis (Boisduval)(Lepidoptera: Noctuidae)
- EL-SAYED HATEM, A, and VARGAS OSUNA, E.
- Entomologia Agroforestal. Departamento de Ciencias y Recursos
Agricolas y Forestales. Universidad de Cordoba. Apartado 3048.14080 Cordoba, Spain.
Abstract
Lethal and sublethal effects of Bacillus thuringiensis var. kurstaki on the cotton leafworm Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) larvae were determined by a diet incorporation bioassay. Newly molted third instar larvae were exposed through ingestion to different concentrations of CrlAc toxin. Larval mortality of S. littoralis increased with the concentration resulting LC50 value of 40 g/ml. Lethal time decreased with increasing toxin concentration. Fifty percent of the larvae died after 6.2 days at 40 g/ml and 5.5 days at 320 g/ml. Sublethal effects were studied by treated the third instar larvae with LC50. The toxin significantly increased larval development period from treatment until pupation. The pupation period increased significantly in female pupae. However, no significant differences were found in preoviposition and oviposition periods. Spermatophore number, fecundity, egg viability and adult longevity were not affected.
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| New Publications |
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The Arab Scientists in Cooperation with The High Institute of Marine Research. Publish all the researches abstracts, which presented in The Regional Workshop on Marine Sciences and Natural Resources, Tishreen University, Lattakia, Syria, 25-26 May 2004.
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| New Publications |
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The Arab Scientists in Cooperation with The Egyptian Society for Biological Control of Pests . Publish all the researches abstracts, which presented in The First Arab Conference of Applied Biological Pest Control, Cairo, Egypt, 5-7 April 2004.
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| Conferences, Fez |
The First International Symposium on Environnement protection for development Biotechnological aspects. Fez, December
15 – 17, 2004.
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| Conferences, Syria |
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The Second Syrian-Egyptian conference in the Agriculture and Food.
Agriculture Faculty, Al-Baath university, Homs, Syria. 25-28 April, 05
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| Conference,Yemen |
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Current Status of Plant Protection in Yemen and Future Strategy.
Faculty of Agriculture, Sana'a University, Sana'a, yemen. December 18-20/2004
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| Conferences Canada |
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The 9th International Conference of the Orthopterists’ Society
Canada, on August 14 19, 2005
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| Conferences, Egypt |
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The First Arab Conference on Applications of Biological Control of Pests in Arab Countries
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| Workshop,Lebanon |
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New Workshop
Middle-East Academy for Medicine of Ageing
First Annual Middle-East Age & Aging Meeting
8-11 April, 2004
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| Publications |
Arab Society for Plant Protection (ASPP) in Cooperation with The Arab Scientists
Publish all the researches abstracts, which presented in the Eighth Arab Congress of
Plant Protection, held in Faculty of Agriculture, Omar Al-Mukhtar University, El-beida
City, Libya, October 12-16,2003
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