ACKNOWLEDGEMENTS The author wishes to express sincere appreciation to Dr. Roy C. Harrell, his major advisor and friend, for guidance and assistance provided during the graduate program. For the enormous amounts of time Dr. Harrell invested reviewing this dissertation, the author is especially grateful. Thanks are also due to the professors who graciously gave of their time to serve on the graduate committee: Dr. Keith Doty, Dr. John Staudhammer, Dr. Robert Peart, and Dr. Carl Crane. These men provided necessary excitement and instruction for making the author capable of completing this project. Mr. Ralph Hoffman provided some very necessary assistance with the tests which are described within this dissertation. He was always available with an encouraging word, never even once refusing to assist with even the most mundane chores. For all of this, the author is grateful. Mr. Phil Adsit, a fellow graduate student, assisted with many of the programming tasks which were undertaken in this work. He gave much-needed encouragement and advice as he worked so closely with the author. Much appreciation is extended to Mr. P. Financial assistance was awarded to the author in the form of a fellowship under the USDA Food and Agricultural Sciences National Needs Graduate Fellowships Grants Program. For this assistance, the author is also grateful. Funding for the citrus picking robot was provided by Agricultural Industrial Development, SpA, Catania, Italy. Most importantly, the author expresses sincere thanks to his parents, Mr. and Mrs. William H. Pool, for their encouragement and support during this project. Their leadership and guidance proved invaluable to the completion of this work. ii