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[9000688.] رقم البحث : 9000688 - |
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Role Of Carbohydrate Hydrolyzing Enzymes In The Mode Of Action Of Igr And Bioinsecticides. / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / |
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M.M. Abdel Hafez |
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A.M. Aboul-Enein |
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M.A., Afifi |
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M.H. Al-Elimi |
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A.M. Farag |
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Carbohydrate hydrolyzing enzymes, IGR, bioinsecticides, Spodoptera littorali |
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The present study was carried out to evaluate the effects of the lethal dose (LC50) of abamectin and
two IGRs on cotton leafworm Spodoptera littoralis from the point of biochemical aspects. The relative
susceptibility of two strains of the pest (laboratory and field strains) to three insecticides; i.e.,
diflubenzuron, pyriproxyfen and abamectin, was tested using dipping technique. Values of the LC50 were
calculated for each compound. The tolerance ratio was determined on basis of the LC50
Key Words: Carbohydrate hydrolyzing enzymes, IGR, bioinsecticides, Spodoptera littoralis
values of the two
tested strains. Obtained results revealed that the field strain exhibited different degrees of tolerance towards the three tested insecticides which can be arranged as follows: pyriproxyfen (10.5 folds),
diflubenzuron (5.5 folds) and abamectin (5.3 folds). The three tested compounds caused inhibitions of
trehalase and invertase activities in treated larvae during all time intervals when compared to untreated
insects with exception to invertase. An increase in its activity was obtained at the last time intervals after
treatment with diflubenzuron and pyriproxyfen. Both diflubenzuron and pyriproxyfen caused an increase
in the amylase activity, while abamectin caused a decrease in the enzyme activity. |
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