Abstract:

The insecticidal activities of the four different extracts from a novel pesticidal plant—Stelera chamaejasme L. were studied. Three kinds of important enzyme systems of Tetranychus viennensis Zacher were tested. The results indicated that the extracts of S.chamaejasme had strongly pesticidal activities against T.viennensis. At the same time, when contacting with the extract in chloroform, the activities of protease, glutathione-S-transferase and esterase isozyme in T.viennensis were induced, but when feeding with the leaves absorbing the extract in chloroform, the activities of protease and glutathione-S-transferase in T.viennensis were not very clearly effected, but that of esterase isozyme was inhibited.

Key words: Stellera chamaejasme L., Tetranychus viennensis Zacher, Biological activity, Esterase isozyme, Glutathione-S-transferase, Protease