Abstract: The volatiles emitted from the various treated tea shoots were dynamically entrapped by Tenax GC and identified by GC and GC-MS. Results showed that the volatiles emitted from various treated tea shoots differed in composition and relative contents. Volatile emitted from intact tea shoots (IS) was composed of a blend of 11 components; while volatile emitted from mechanically damaged tea shoots (MDS) was a blend of 13 components and volatile from plant host feeding complex (PHC) was a blend of 15 components. Volatile extracted from tea shoots by SDE method was identified to be a blend of 13 components. The order of relative contents from above treatments is SDE>MDS>PHC>IS. Y-tube olfactometer bioassay results showed that inexperienced female wasps had no preference to volatiles emitted from IS and MDS over clean air (control) statistically, while strong preference to volatiles emitted from MDS+Reg, LDS, and PHC over control was observed.

Key words: tea plant, tea geometrid, Apanteles sp., tritrophic system, volatile