Abstract
BackgroundIn the present study, the comparative toxicity of three different acaricides (abamectin, chlorfenapyr, and pyridaben) in technical and formulated forms was assessed on the eggs and adult females of a susceptible strain of Tetranychus urticae. Joint toxic effects of the tested acaricides were also performed against eggs and adults. In addition, the in vitro assay of the tested acaricides was evaluated against some target enzymes isolated from the adult females.ResultsThe LC50 values against eggs by leaf-disk-dip technique were estimated to be 294.27, 1032.93, and 9550.54 mg/L for abamectin, chlorfenapyr, and pyridaben, respectively. However, the LC50 values were 783.06, 666.55, and 731.36 mg/L for the formulations Agromectin, Challenger, and Sanmite, respectively. Abamectin was found to be the greatest lethal to the adults (LC50 = 5.39 mg/L) followed by chlorfenapyr (LC50 = 106.51 mg/L) after 24 h of the treatment by slide-dip technique. Pyridaben was least toxic (LC50 = 690.23 mg/L). Agromectin (LC50 = 0.94 mg/L) followed by Challenger (LC50 = 73.65 mg/L) while the Sanmite was the lowest toxic one (LC50 = 1160.60 mg/L) against the adults. The results of joint toxic action proved that all combinations between the technical or formulated acaricides exhibited potentiation effect and the toxicity was increased significantly against eggs and adults of T. urticae compared to the individual pesticide. The activity of acetylcholinesterase (AChE), adenosine triphosphatase (ATPase), acid and alkaline phosphatases (ACP and ALP), carboxylesterase (CaE), gamma-aminobutyric acid transaminase (GABA-T), and glutathione-S-transferase (GST) isolated from adults treated with 0.025, 0.05, 0.1, 0.5, 1, and 5 mg/L were significantly inhibited compared to the control.ConclusionThis study provides the theoretical basis for a rational application of abamectin, chlorfenapyr, and pyridaben mixtures in T. urticae control.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
