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Ahmad, Mahmood Dept. of Applied and Molecular Ecology 1999 http://hdl.handle.net/2440/19815 Leaves 101-104 are misnumbered. Bibliography: leaves 155-215. xiii, 215 leaves : ill. (some col.) ; 30 cm. In this study thirteen populations of P. xylostella from crucifer growing areas of Queensland, Victoria, Tasmania, South Australia and Western Australia were surveyed for resistance to Bt (Bacillus thuringiensis) toxins using a leaf-dip bioassay method. Thesis (Ph.D.)--University of Adelaide, Dept. of Applied and Molecular Ecology, 2000 66949 bytes application/pdf en Pests Biological control Initial frequencies of alleles for resistance to Bacillus thuringiensis toxins in field populations of Plutella xylostella and Helicoverpa armigera / by Mahmood Ahmad. Thesis This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exception. If you are the author of this thesis and do not wish it to be made publicly available or If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legalsopen.access