Acaricidal Activities of Root Extracts of Tateges erecta against Tetranychus viennensis

摘要

The acaricidal activities of root extracts from the of Tateges erecta against T. viennensis were determined under illumination and non-illumination conditions. Furthermore, the effects of chloroform extract on several enzymes activities of T. viennensis were also evaluated. According to the F-test statistical analysis, the chloroform extract had acaricidal activities against T. viennensis under non-illumination condition, but petroleum ether, and methanol extracts had no significant acaricidal activities. Furthermore, the extracts of T. erecta had photo-activated insecticidal activity, and the mean lethal concentrations (LC50) of chloroform, petroleum ether, and methanol extracts were respectively 5.8mg/mL, 3.5 mg/mL and 8.4mg/mL under illumination condition. The enzymatic activity assay suggested that the protease activities in T. viennensis were obviously inhibited by the extracts, while the activity of glutathione-s-transferase was activated under non-illumination condition, but significantly inhibited under illumination condition. The activities of esterase isozymes in T. viennensis were not significantly influenced under non-illumination condition, but were significantly inhibited under illumination condition.