Acaricidal Activities of Wikstroemia chamaedaphne Extracts against Tetranychus urticae and Tetranychus cinnabarinus (Acari: Tetranychidae)

Various extracts of Wikstroemia chamaedaphne were evaluated their acaricidal activities against Tetranychus cinnabarinus (Boisduval) and Tetranychus urticae Koch (Acari: Tetranychidae) in laboratory. According to our study, the Wikstroemia chamaedaphne extracts had significant acaricidal activities against T. cinnabarinus and T. urticae. In this study, the mean LC₅₀ value for T. cinnabarinus and T. urticae were 0.79 mg/mL for methanol extracts of W. chamaedaphne, which were liquid partitioned from the crude methanol extracts using the water bath immersion method. Conventional column chromatography was used to further purify active components from methanol partition extracts. The obtained 7^th chromatographic fraction caused a mortality rate of 94.21 % for T. cinnabarinus, 91.52 % for T. urticae, and the 10^th chromatographic fraction caused a mortality rate of 85.92 % for T. cinnabarinus, 88.21 % for T. urticae.