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Interactions of Rotylenchulus Reniformis and Meloidogyne Incognita on Sweet Potato

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Interactions of Rotylenchulus Reniformis and Meloidogyne Incognita on Sweet Potato Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1982 Interactions of Rotylenchulus Reniformis and Meloidogyne Incognita on Sweet Potato. Ronald James Thomas Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Thomas, Ronald James, "Interactions of Rotylenchulus Reniformis and Meloidogyne Incognita on Sweet Potato." (1982). LSU Historical Dissertations and Theses. 3774. https://digitalcommons.lsu.edu/gradschool_disstheses/3774 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. For more information, please contact [email protected]. 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Universft/ Microfilms International 300 N. Zeeb Road Ann Arbor, Ml 48106 8229S17 Thomas, Ronald James INTERACTIONS OF ROTYLENCHULUS RENIFORMIS AND MELOIDOGYNE INCOGNITA ON SWEET POTATO The Louisiana State University and Agricultural and Mechanical PH.D. 1982CoL University Microfilms International300 N. Zeeb Read, Ann Arbor, MI 48106 INTERACTIONS OF ROTYLENCHULUS RENIFORMIS AND MELOIDOGYNE INCOGNITA ON SWEET POTATO 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 Plant Pathology and Crop Physiology by Ronald James Thomas B.S. Brigham Young University, 1974 M.S. Texas A & M University, 1977 August 1982 ACKNOWLEDGEMENT The author wishes to express his sincere appreciation to his major professor Dr. Christopher A. Clark for his invaluable advice and ready assistance during the course of this research; and in the preparation of this dissertation. Appreciation is extended to Dr. W. J. Martin, Head of the Department of Plant Pathology and Crop Physiology, for making financial support and facilities available during the program and to the faculty, staff, and students for advice, assistance, and friendship. Appreciation is also extended to the members of his examining committee: Dr. W. Birchfield, Dr. W. J. Martin, Dr. L. L. Black, and Dr. T. P. Hernandez for their constructive criticism of this manuscript. Sincere thanks are extended to Dr. V. L. Wright of the Department of Experimental Statistics for his advice on statistical analysis. The author is deeply grateful to research associates Amanda Lawrence and Barbara Watson and to his fellow graduate student Gary Lawrence for their friendship and many hours of research assistance. Finally, the author wishes to thank his parents for their constant support and encouragement during this study. ii TYPED BY JANET EVANS, GRATIS iia tj TABLE OF CONTENTS ACKNOWLEDGEMENT ................................................ ii LIST OF T A B L E S .................................................. iv LIST OF FIGURES.................................................. vl ABSTRACT .........................................................vii REVIEW OF LITERATURE .......................................... 1 Root-knot Nematode and the Sweet Potato .................. 2 Root-knot infection and damage to sweet potato .... 2 The search for resistant cultlvars ................... 4 Nature and Inheritance of resistance ................. 5 Renlform Nematode and the Sweet Potato .................... 7 Nematode-Nematode Interactions ......... 9 Root-knot and Renlform Interactions ...................... 13 LITERATURE CITED .............................................. 15 I. POPULATION DYNAMICS AND EFFECT ON SWEET POTATO OF CONCOMITANT MELOIDOGYNE INCOGNITA AND ROTYLENCHULUS RENIFORMIS.....................................22 Abstract..................................................... 23 Introduction.......... 24 Materials and Methods .................................... 26 R e s u l t s ..................................................... 30 Discussion................................................... 34 Literature Cited .......................................... 37 Tables and Figures ..... .............................. 40 II. EFFECTS OF CONCOMITANT DEVELOPMENT ON REPRODUCTION OF MELOIDOGYNE INCOGNITA AND ROTYLENCHULUS RENIFORMIS ON SWEET P O T A T O...................................45 Abstract................................................ • 46 Introduction ..... 47 Materials and Methods . ....................... ..... 48 R e s u l t s ..................................................... 49 Discussion...................................................53 Literature Cited .......................................... 57 Tables and Figures...........................................59 VITA ............................................................. 65 ill LIST OF TABLES I. POPULATION DYNAMICS AND EFFECT ON SWEET POTATO OF CONCOMITANT MELOIDOGYNE INCOGNITA AND ROTYLENCHULUS RENIFORMIS. Table Page 1 Field Test 1979. Pearson product-moment correlations (r) between Initial population levels of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (MI) in a naturally Infested sweet potato field and subsequent population levels ........................................... 40 2 Field Test 1980. Effects of Rotylenchulus renifomis (Rr) and Meloldogyne incognita (Mi) on yield and fleshy root cracking of sweet potato cultivars ...................... 41 3 Field Test I 1981. Effect of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (Mi) on yield and fleshy root cracking) and nematode counts in cull and marketable fleshy roots of Porto Rico sweet potato ..................... 42 4 Field Test II 1981. Effects of fumigation and artificial Meloidogyne incognita (Mi) infestation on yieldf fleshy root cracking) and nematode counts in cull and marketable fleshy roots of Porto Rico sweet potato in field plots naturally infested with Rotylenchulus reniformls ........... 43 II. EFFECTS OF CONCOMITANT DEVELOPMENT ON REPRODUCTION OF MELOIDOGYNE INCOGNITA AND ROTYLENCHULUS RENIFORMIS ON SWEET POTATO. Table Page 1 Effect of inoculum level and harvest date on Centennial sweet potato fibrous root weight and reproduction of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (Mi) alone and in combination after 46 and 78 d a y s ......... 59 2 Effect of varying levels of Rotylenchulus reniformls (Rr) on Meloidogyne incognita (Mi) reproduction after 44 days on Centennial sweet potato .................................... 60 3 Reproduction of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (Mi) concomitant on the same host plant but on separate root systems of Centennial sweet potato vines for 70 d a y s ..................................61 4 Effect of watering method on sweet potato fibrous root weight and reproduction of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (Mi) alone and in combination .... 62 iv Effect of simultaneous and delayed inoculation of one nematode species on reproduction of a second species on Porto Rico sweet potato after 90 days .............. LIST OF FIGURES I. POPULATION DYNAMICS AND EFFECT ON SWEET POTATO OF CONCOMITANT MELOIDOGYNE INCOGNITA AND ROTYLENCHULUS RENIFORMIS. Figure Page 1 Concomitant population dynamics of Rotylenchulus reniformls (Rr) and Meloidogyne incognita (Mi) on sweet potato. A) 1980 test and 8) 1981 test fumigated with methyl bromide and artificially infested with low levels (100/250 cm3) of Rr and/or Mi. C) Rr and D) Mi populations in second 1981 test in plots naturally infested
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