SUBLETHAL EFFECTS OF SELECTED INSECTICIDES ON OXIDATIVE STATUS AND ANTIOXIDANTS IN COWPEA  WEEVIL, CALLOSOBRUCHUS MACULATUS (F.)  [COLEOPTERA: CHRYSOMELIDAE

Ammar, Hager A.; Elbermawy, Zenab; Soliman, Zeinab Elshahat; Abouelghar, Gamal E

doi:10.21608/mjapam.2024.260415.1027

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	SUBLETHAL EFFECTS OF SELECTED INSECTICIDES ON OXIDATIVE STATUS AND ANTIOXIDANTS IN COWPEA WEEVIL, CALLOSOBRUCHUS MACULATUS (F.) [COLEOPTERA: CHRYSOMELIDAE
Article 8, Volume 9, Issue 1, January 2024, Page 1-13 PDF (656.02 K)
Document Type: Original Article
DOI: 10.21608/mjapam.2024.260415.1027
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Authors
Hager A. Ammar¹; zenab elbermawy²; Zeinab Elshahat Soliman³; Gamal E Abouelghar ⁴
¹faculty of agriculture
²Department of Pesticides Faculty of Agriculture Menoufia University
³Faculty of agricultural.menofi university.
⁴Moustafa Kamel Street
Abstract
The toxicity of pesticides is correlated to the generation of free radicals, oxidative damage induction, increased lipid peroxidation (LPO) and interruption of the total antioxidant potential. The present study was undertaken to characterize the role of sublethal concentration (LC₅₀) of five selected insecticides (abamectin, emamectin benzoate, imidacloprid, indoxacarb and spinosad) on the oxidative stress and antioxidants in Callosobruchus maculatus (F.). The 24 h- LC₅₀values of tested insecticides showed that emamectin benzoate was the most toxic insecticide (56.95 ppm) followed by indoxacarb (95.5 ppm) and spinosad (107.8 ppm) ; whereas abamectin and imidacloprid were the least toxic insecticides (148.2 and 209.8 ppm, respectively). For the oxidative status assays, the insect adults were exposed to cowpea seeds treated with LC₅₀ of each tested insecticide for 24 h. The results showed a significant increase in the lipid peroxidation (LPO), expressed as malondialdehyde (MDA) content, after exposure to emamectin benzoate and imidacloprid than that of the control. Data of the antioxidants showed that both glutathione reduced (GSH) and glutathione peroxidase (GPx), significantly elevated in all tested insecticide treatments in comparison with the control. However, the activity of superoxide dismutase (SOD) was significantly decreased particularly by abamectin, indoxacarb and spinosad. Our study revealed that oxidative imbalance induced in C. maculatus adults after exposure to sublethal concentration (LC₅₀) of the tested insecticides may be helpful for molecular base study of the toxicity mechanism of these insecticides. Also, such biomarkers used in the present study represent good indicators of pesticide-induced oxidative stress
Keywords
Cowpea weevil; Novel insecticides; Sublethal effects; Oxidative stress; Antioxidants
Supplementary Files غلاف وقاية نبات2024.pdf

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