Electrophysiological Responses of Bactrocera dorsalis and Bactrocera correcta to Volatiles from Mango Fruits

Purpose In order to help explain infection and distribution of oriental fruit fly, B. dorsalis and guava fruit fly, B. correcta in same area, and to provide a theoretical basis for the development of attractants, the differences of chemical communication between the two species and host plant were explored, respectively.

Method Olfactory response of the oriental fruit fly and guava fruit fly to volatiles from mango fruits was determined by EAG.

Result Volatiles from mango fruits elicited EAG responses of both oriental fruit fly and guava fruit fly, which showed a significantly higher EAG response than the control (liquid paraffin)(P<0.05), and different EAG responses of males, mated and unmated females to mango odors were recorded, among which the EAG value to (E)-2-hexenal was the highest, with relatively low values to 3-carene, α-terpinolene, methyl eugenol. Oriental fruit fly presented different EAG responses from guava fruit fly to the same compound due to interspecific difference and the long-term adaptation of oriental fruit fly, guava fruit fly to host odors.

Conclusion The chemical communication between the two and the same host plant was very different, and 3-carene had a potential to become lures for both sexes of guava fruit fly.