Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups
Hendawi, M., Shalaby, A., Desuky, W., El-Morshedy, A. (2017). Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups. EKB Journal Management System, 8(3), 125-133. doi: 10.21608/jppp.2017.46169
M. Y. Hendawi; A. A. M. Shalaby; W. M. H. Desuky; A. E. El-Morshedy. "Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups". EKB Journal Management System, 8, 3, 2017, 125-133. doi: 10.21608/jppp.2017.46169
Hendawi, M., Shalaby, A., Desuky, W., El-Morshedy, A. (2017). 'Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups', EKB Journal Management System, 8(3), pp. 125-133. doi: 10.21608/jppp.2017.46169
Hendawi, M., Shalaby, A., Desuky, W., El-Morshedy, A. Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups. EKB Journal Management System, 2017; 8(3): 125-133. doi: 10.21608/jppp.2017.46169

Joint Action and Biochemichal Alteration in Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) against four Insecticides from Different Groups

Journal of Plant Protection and Pathology
Article 5, Volume 8, Issue 3, March 2017, Page 125-133  XML PDF (273.45 K)
Document Type: Original Article
DOI: 10.21608/jppp.2017.46169
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Authors
M. Y. Hendawi1; A. A. M. Shalaby1; W. M. H. Desuky2; A. E. El-Morshedy2
1Plant Prot. Dept., Fac. Agric., Zagazig Univ., Egypt
2Plant Prot. Res. Institute, ARC, Dokki, Giza, Egypt
Abstract
Joint action and biochemical alteration in the 4th instar larvae of a laboratory strain of cotton leafworm, Spodoptera littoralis (Boisd.), were evaluated under the laboratory condition against four insecticides from different groups namely: chlorpyrifos, chlorfluazuron, emamectin benzoate, pyrethrins. The toxicity effect for each single compound and binary mixture at levels 1:1, 1:2: and 2:1 from LC25 were evaluated. The study indicated that emamectin benzoate followed by chlorfluazuron proved to be the most effective compounds among all tested insecticides. The highest initial effect (76.66%) was obtained by mixing chlorpyrifos: chlorfluazuron at level 1:2, respectively. while the lowest initial effect (3.33%) was obtained as a result of mixing emamectin benzoate with pyrethrins at level 1:2, respectively, the same effect occurred with chlorpyrifos: pyrethrins at level 1:1. Changing in enzymatic activities as responses of treatment with mixtures at LC25 of all tested compounds, except for pyrethrins was studied at the recommended concentration, after 1and 3 days post treatment. Our study noticed that mixing of pesticides caused antagonism effect except chlorpyrifos plus pyrethrins at the ratio 2:1 caused potentiation effect. Under the effect of the tested insecticides the data showed increasing in total soluble protein and total lipids contents, reduction in carbohydrate hydrolyzing enzymes (amylase, invertase and trehalase), increasing in  transaminase enzymes (AST and ALT) and reduction in phosphatase enzymes (ACP and ALP)  activities .Our data recommend not to mix these insecticides due to the antagonistic effect.
Keywords
joint action; Spodoptera littoralis; enzymatic activity; Pesticides; potentiation; Antagonism
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