Prof. Dr. Silvia Dorn, Professor of Applied Entomology from ETH Zurich in Switzerland was on a scientific exchange to the Australian Cotton Research Institute (ACRI) in Narrabri from 5 – 12 February 2011. The exchange was organized by Dr Robert Mensah (NSW Department of Industry & Investments, Australian Cotton Research Institute Narrabri, NSW) and Assoc. Prof. Gimme Walter (School of Biological Sciences, University of Queensland, Brisbane). Prof. Dorn gave two presentations during the visit to staff of University of Queensland (UQ), NSWDII, CSIRO and DEEDI. The presentations were titled “Herbivore behaviour matters: insect flight performance and host switch” The presentations emphasized the importance of insect flight and choice behaviours of Helicoverpa spp. between Bt cotton and refuge crops. According to Prof. Dorn, insect species can evolve adaptations to distinct host plants, limiting the gene flow between populations from different host plant species and this will have implications on Helicoverpa spp. resistance management in transgenic cotton crops in Australia