Evaluation on acaricidal activities in 8 medicinal plants extracts against Tetranychus cinnabarinus
Acaricidal activities of twenty-four plants extracts against Tetranychus cinnabarinus were measured using slide-dip method.The results showed that the mortality from methanol extract of Momordicae Cochinchinensis and Folium Photiniae,Momordicae Cochinchinensis,Fructus Carpesii Abrotanoidis,Folium Photiniae and Duchesnea indica(Andrews)Focke chloroform extract,Semen Impatientis and Momordicae Cochinchinensi petroleum ether extract had significantly higher acaricidal activities than the others at the concentration of 2 mg/mL.The most effective crude extract was Momordicae Cochinchinensi petroleum ether extract,with the mortality rate of 77.52 %.The lowest mortality rate was 9.52 %,which was Orostachys methanol extract.According to the primary screening test results,the contact toxicities of two herbal extracts against Tetranychus cinnabarinus were determined using a series concentration of various extracts.The results showed that Momordicae Cochinchinensis petroleum ether extract showed the highest acaricidal activities with LC50 value of 0.539 5 mg/mL.