The toxicities of extracts of Tateges erecta against Tetranychus viennensis, and the effects on several enzymes of Tetranychus viennensis conducted with the chloroform extracts were studied. The results showed that the extracts of Tateges erecta possessed high bioactivity against Tetranychus viennensis. In photic group, when treated with the extracts of chloroform, petroleum ether and methanol, the LC_ 50 were 5.833, 3.508 and 8.445 9 mg·mL -1 respectively. The activities of glutathiona {S_transferase} and esterase isozyme can be strongly inhibited by the chloroform extracts in the photic group. In dark group, the activity of glutathiona S_transferase and protease were induced and inhibited respectively, the variety of esterase isozyme was not obvious.
Wikstroemia chamedaphne was investigated for its acarocidal activity against Tetranychus viennensis, a serious pest of many crops including apple trees in China. Its active constitutes were extracted,separated and purified. The results indicated that the extraction of petroleum ether from WCME （Wikstroemia chamaedaphne methanol extract） appeared a strong acarocidal activity. The adjusted mortalities of egg,larva and female mite were 74.48%,100.00% and 100.00% respectively, while the LC50 values were 2.106 2、0.304 1 and 0.771 6 mg·mL-1 respectively.
