Abstract:

The different parts of Kochia scoparia were investigated for their acarocidal activity against Tetranychus viennensis．The result indicated that the bioactivity of chloroform extract of seed of K．Scoparia was the higher than that of root，stem and foliage of K．Scoparia，the adjusted mortalities of egg and female mite were 63.37％ and 70.02％．Respectively at the concentration of 2 mg·Ml^-1 The chloroform extract of seed was then separated and purified．The silica gel column was used to separate and purify active constitutes of the crude extracts of chloroform．A total of 11 bands were seen by TLC analysis．The band 2 appeared a strong acarocidal activity against T．Viennensis，the adjusted mortalities of egg and female mite were 68.01％ and 87.10％，respectively at the concentration of 1 mg·Ml^-1．

Key words: Kochia scoparia, Tetranychus viennensis, biological activity