Oviposition preferences of the oriental fruit moth Grapholita molesta (Lepidoptera: Tortricidae) to pear HIPVs

Herbivore-induced plant volatiles (HIPVs) are regarded as an indirect defense against herbivores, since they attract natural enemies to infested plants. On the other hand, HIPVs also affect behavioral responses of herbivores. In a previous study, Lytopylus rufipes, parasitoid oriental fruit moth (Grapholita molesta), showed positive pear HIPVs, but influence on G. molesta is still unclear. To better understand these responses, we first tested oviposition preferences uninfested and shoots (US IS, respectively) mature leaves (ML) in dual-choice bioassays using cylindrical tube. Then, volatile components were assessed. females preferred US-, IS-, ML-treated areas compared control area (no leaves), respectively. Subsequently, IS over US, US more than ML bioassays. Furthermore, did not show any significant preference for individual components, eggs laid treated with synthetic HIPV blend, hexane-treated (control). These results indicate that do avoid nor HIPVs. Moreover, may recruit only enemies, release point Thus, it important examine field before employing them pest management.