Efficacy of nano-silver with lavender (Lavandula angustifolia Mill) plan extract against Tetraychus urticae Koch (Acari:Tetranychidae )

Recently, in many countries, synthetic pesticides have been replaced by plant-origin pesticides in agricultural area because it is aimmed to reduce the use of chemical pesticides and to use human and environmentally friendly plant-based pesticides.The use of nanoparticles from plants associated with biopesticides is gaining an increasingly important in agriculture. Tetranychus urticae Koch (Acari: Tetranychidae) is an aggressive, invasive species that is harmful to park, forest, ornamental and many cultivated plants. In this study, silver nanoparticles (AgNPs) were synthesized using Lavandula angustifolia Mill water extract. The synthesized AgNPs was identified by Ultraviolet-Visible (UV-Vis) spectrophotometer, Fouirer Transform-Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) techniques. AgNPs exhibited a maximum UV-vis absorbance at 480 nm. Hydroxyl group was observed at 3262.97 cm-1in FTIR spectrum. AgNPs were found to be spherical and less than 50 nm in diameter.The acaricidal effect of extract and AgNPs was investigated using leaf dipping method. Experiments were carried out using (3cm diameter) leaf disks of Phaseolus vulgaris L.angustifolia Ethanol extract and silver nanoparticles (AgNP) were compared in 4 different concentrations. The acaricidal effect of ethanol extract was found as 95.46% and 62.24% at the concentration of 12% and 6% for 5 days respectively. AgNPs effect was observed as 98.82% at 336 ppm at the same period. As a result, AgNPs used in this study are thought to be used as an alternative method to pesticides for control ofTetranychus urticae Koch (Acari: Tetranychidae).