Attractive effect to Bactrocera dorsalis and the GC-MS analysis of volatiles components from Pyrus brestschneideri Rehd

The attraction of Pyrus brestschneideri Rehd to Bactrocera dorsalis was studied by using“ Y”-tube olfactometers in laboratory. The volatiles from P. brestschneideri Rehd were collected by solid phase microextraction （SPME） and identified by gas chromatographic-mass spectrometric（ GC-MS） in this research. The present experiment was conducted to explore the attractive compound and provide some theoretical basis for further study on the attractant of female B. dorsalis. The results showed that the P. brestschneideri Rehd had significantly attracting ability to female B. dorsalis. The main components of the volatiles of P. brestschneideri Rehd were ester compounds and the content of each compounds was greater than 0.5%. These compounds were Ethyl hexanoate（ 28.65%）， Ethyl acetate（ 21.96%），Ethyl butyrate（ 15.48%），Ethyl octoate（ 4.80%），Hexyl acetate（ 3.50%），Ethyl 2-methylbutyrate（ 3.33%），D-Limonene（ 1.89%），Ethyl heptanoate（ 1.18%），Tetradecane（ 0.54%）， α-Farnesene（ 0.52%），respectively. The results indicated that P. brestschneideri Rehd has a lure activity to the female B. dorsalis and these esters may be the active compound of P. brestschneideri Rehd.