........................................................................................................................................ ii Acknowledgments........................................................................................................................ iv List of Tables ............................................................................................................................... vi List of Figures ............................................................................................................................. vii Chapter 1: Introduction and Literature review .............................................................................. 1 Chapter 2: Multiple Detoxification enzymes facilitate Polyphagy in adult Japanese beetles, Popillia japonica Newman ....................................................................................... 36 Chapter 3: Geranium/Quisqualic acid Intoxication and Detoxification Enzymes in Japanese beetle ........................................................................................................................ 56 Chapter 4: Influences of Life stage and Time of Feeding on the activities of Detoxification enzymes in Japanese beetle ....................................................................................... 69 References ................................................................................................................................. 71