Objectives 1. Establish lines of known parentage from available resistant strains of H. armigera (derived from VICRATS and RATS from Dr Neil Forrester, formally NSW Agriculture) 2. Establish the genetic mapping techniques, determine the contributions of different chromosomes to the resistance phenotype, compare this map to those available for Bt resistant Heliothis virescens 3. Provide the strains to Dr Ray Akhurst, CSIRO Entomology, for analysis of the mechanisms associated with resistance and to Dr Forrester for field studies.