Evaluation Of The Acaricidal Activity Of34Plants Extracts And Study On Botanical Acaricide Formulation

Botanical insecticides have novel modes of action, low toxicity to non-target organismsand mammals, and are less harmful to the environment, Compare with botanical insecticidesgot widespread concern, botanical acaricides had’t deserved more attention. In order toprovide candidate plants for develop safer, more environmentally friendly and efficientbotanical acaricides. The purpose of this study was to evaluate the acaricidal activity of117plants in the northwest area of China. The main results are as follows:(1) Acaricidal activity of34acetone extracts against Tetranychus cinnabarinus weretested with slide-dip method. Seven plant extract showed higher mortality (48h) with mornthan80%at the concentration of0.2g/mL. S. tsinlingensis、A. ageratoides、L. hispida、V.dilatatum、G. biondiana showed highert mortality (48h) with morn than50%at theconcentration of0.1g/mL. The acetone extract of L. hispida have highest toxicity againstadult of Tetranychus cinnabarinus with90.89%corrective mortality (48h) at theconcentration of0.2g/mL, and still exhibited highest toxicity (48h) at the concentration of0.1gDW/mL.(2) Use the extract of L. hispida as the test material and through screening of the solventand emulsifier, to develop a EC formulation. The quality of the EC formulation comply withthe quality standards of pesticides. In the pot test,50and100-fold solutions showed higheractivity.(3) S. tsinlingensis、A. ageratoides、V. dilatatum、G. biondiana exhibited higheracaricidal activity and have great potential for developing as botanical acaricides.