Larvicidal, biochemical and physiological effects of acetamiprid and thiamethoxam against Culex pipiens L. (Diptera: Culicidae). | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 21, Volume 24, Issue 3, May and June 2020, Page 271-283 PDF (639.56 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2020.91119 | ||||
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| Authors | ||||
| Doaa R. Abdel-Haleem; Abir A. Gad; Shaimaa M. Farag | ||||
| Abstract | ||||
| The resistance of mosquitos to conventional insecticides created an urgent need for using alternative insecticides. In this study, the toxicity of the neonicotinoids (acetamiprid and thiamethoxam) was evaluated against the 3rd larval instar of Culex pipens. In the larvicidal assay, acetamiprid and thiamethoxam showed promising larvicidal activity against Cx. pipiens, with LC50 values of 0.0093 and 0.0305 ppm after 24 hrs, 0.0078 and 0.0206 ppm after 48 hrs and 0.0065 and 0.0137 ppm after 72 hrs of insecticidal exposure. The activity of acetylcholinesterase (AChE), carboxylesterase, (α-esterase), (β-esterase), and glutathione S- transferase (GST) were determined after 72 hrs of insecticidal exposure. Acetamiprid showed a significant increase in the activity level of AChE, GST, carboxylesterase, α, and β- esterases than thiamethoxam. The hemocytes of the treated 3rd larval instar of Cx. pipens were sensitive to both insecticides and showed remarkable deformation compared with control. Therefore, both detoxification enzymes and physiological resistance play a great role in neonicotinoids detoxification. | ||||
| Keywords | ||||
| Culex pipens; acetylcholinesterase; carboxylesterase; hemocyte; Acetamiprid; thiamethoxam | ||||
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