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Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1983 Biological, Ecological, and Morphological Investigations of the Rice Water Weevil, Lissorhoptrus Oryzophilus Kuschel, on Two Rice Genotypes. Gary Leonard Cave Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Cave, Gary Leonard, "Biological, Ecological, and Morphological Investigations of the Rice Water Weevil, Lissorhoptrus Oryzophilus Kuschel, on Two Rice Genotypes." (1983). LSU Historical Dissertations and Theses. 3879. https://digitalcommons.lsu.edu/gradschool_disstheses/3879 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. 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These prints are available upon request from the Dissertations Customer Services Department. 5. Some pages in any document may have indistinct print. In all cases the best available copy has been filmed. University Microfilms International 300 N. Zeeb Road Ann Arbor, Ml 48106 8400111 Cave, Gary Leonard BIOLOGICAL, ECOLOGICAL, AND MORPHOLOGICAL INVESTIGATIONS OF THE RICE WATER WEEVIL, LISSORHOPTRUS ORYZOPHILUS KUSCHEL, ON TWO RICE GENOTYPES The Louisiana State University and Agricultural and Mechanical Ph.D. Col. 1983 University Microfilms International300 N. Zeeb Road, Ann Arbor, Ml 48106 Copyright 1984 by Cave, Gary Leonard All Rights Reserved PLEASE NOTE: In all cases this material has been filmed in the best possible way from the available copy. Problems encountered with this document have been identified here with a checkV mark. 1. Glossy photographs or pages^ 2. Colored illustrations, paper or print______ 3. Photographs with dark background 4. Illustrations are poor copy_______ 5. Pages with black marks, not original _______copy 6. Print shows through as there is text on both sides______ of page 7. Indistinct, broken or small print on several_ pages j S _ 8. Print exceeds margin requirements______ 9. Tightly bound copy with print lost in_______ spine 10. Computer printout pages witn indistinct______ print 11. P ag e(s)_____________lacking when material received, and not available from school or author. 12. P a g e (s)_____________seem to be missing in numbering only as text follows. 13. Two pages numbered____________ . Text follows. 14. Curling and wrinkled pages_______ 15. Other__________________________________________________________ University Microfilms International BIOLOGICAL, ECOLOGICAL, AND MORPHOLOGICAL INVESTIGATIONS OF THE RICE WATER WEEVIL, LISSORHOPTRUS ORYZOPHILUS KUSCHEL, ON TWO RICE GENOTYPES A Dissertation Submitted to the Graduate Faculty of the Louisiana State University and Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in The Department of Entomology by Gary Leonard Cave B.S., Florida Technological University, 1974 M.S., Virginia Polytechnic Institute and State University, 1977 August 1983 ACKNOWLEDGEMENTS The author wishes to express his thanks to the members of his Dissertation committee, Drs. C. M. Smith, major professor, J. B. Graves, Professor and head, Department of Entomology, L. D. Newsom, J. F. Robinson, USDA, Rice Research Station, Crowley, Louisiana, K. S. McKenzie, Rice Breeder, Rice Research Station, Crowley, Louisiana, and J. Baker, acting head, Department of Plant Pathology and Physiology. The author also wishes to extend special extra appreciation to L. D. Newsom, who listened patiently to my problems and profferred much useful information and advice. Warmest appreciation is also extended to my wife, Michelle, who diligently and conscientiously prepared the figures for this Dissertation, and whose understanding and patience helped during the exigencies of preparation of this work. Also, special appreciation is extended to my parents who were always there when I needed them most, and whose love and understanding helped me to weather the storm of embryonic "doctorhood". To all of the above, "Alea iacta est". TABLE OF CONTENTS Page ACKNOWLEDGEMENTS................................................. ii LIST OF TABLES................................................... iv LIST OF FIGURES................................................... v ABSTRACT.........................................................vi INTRODUCTION...................................................... 1 LITERATURE REVIEW................................................. 5 CHAPTER I. NUMBER OF INSTARS OF THE RICE WATER WEEVIL, LISSORHOPTRUS ORYZOPHILUS (COLEOPTERA: CURCULIONIDAE)..........................13 CHAPTER II. POPULATION DYNAMICS, SPATIAL DISTRIBUTION, AND SAMPLING OF THE RICE WATER WEEVIL ON RESISTANT AND SUSCEPTIBLE RICE VARIETIES. ...............24 CHAPTER III. SENSILLA OF THE RICE WATER WEEVIL, LISSORHOPTRUS ORYZOPHILUS KUSCHEL (COLEOPTERA: CURCULIONIDAE)..........................47 SUMMARY AND CONCLUSIONS.......................................... 62 LITERATURE CITED. ............................................ 63 APPENDIX 1....................................................... 72 APPENDIX II...................................................... 73 APPENDIX III.................... ............................... 74 APPENDIX IV...................................................... 75 APPENDIX V............................................... 76 APPENDIX VI...................................................... 77 VITA.............................................................78 iii LIST OF TABLES Table Page Chapter I. 1. Head capsule widths (mm) and ratios between instars for larvae of L_. oryzophilus Kuschel, Crowley, La., 1981.......... 17 Chapter II. 1. L. oryzophilus populations on Saturn and PI 321264 rice. 1981-1982. Crowley, Louisiana............................... 32 2. Duration estimates of JL. oryzophilus Kuschel larval instars. Crowley, Louisiana.......................... 37 2 3. Regression of log variance (s ) on log mean (m) for L^. oryzophilus immatures on PI 321264 and Saturn rice at Crowley, Louisiana. 1981-1982.............................. 38 & 4. Regression of mean crowding (m) on mean density (m) for 1^. oryzophilus immatures on PI 321264 and Saturn rice at Crowley, Louisiana. 1981-1982.............................. 39 Chapter III. 1. Mean number of sensilla on the antennal club of Lissorhoptrus oryzophilus....................................56 2. Mean lengths (pm) of various sensilla types on the antennal club of Lissorhoptrus oryzophilus............................ 57 LIST OF FIGURES Figure Page Chapter I. 1. Frequency distribution of larval head-capsule widths of the rice water weevil, Lissorhoptrus oryzophilus Kuschel.......... 19 2. Semilog plot of the mean larval head-capsule width of the four instars using the regression line, In Y=-2.815 + 0.346X.........................................21 Chapter II. 1. Adult Lissorhoptrus oryzophilus feeding on PI321264 (resistant) and Saturn (susceptible) rice. Crowley, Louisiana. 1981-1982.........................................31 2. Lissorhoptrus oryzophilus Kuschel populations on resistant (PI32.1264) and susceptible (Saturn) rice varieties. Crowley, Louisiana. 1981-1982............................... 35 3. Sequential sampling scheme for larvae of Lissorhoptrus oryzophilus. Crowley, Louisiana. A: Precision level 0.10; B: Precision level 0.15......................................43 Chapter III. 1. The antenna of the rice water weevil, 200x.................... 52 2. The tip of the antennal club (segments I, II, III, IV), 900x. .52 3. Sensilla placodea

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