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Effect of Host Plants and Pesticides on Parasitism of Haeckeliania Sperata on Diaprepes Abbreviatus

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Effect of Host Plants and Pesticides on Parasitism of Haeckeliania Sperata on Diaprepes Abbreviatus EFFECT OF HOST PLANTS AND PESTICIDES ON PARASITISM OF HAECKELIANIA SPERATA ON DIAPREPES ABBREVIATUS By DANIEL CARRILLO A THESIS PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE UNIVERSITY OF FLORIDA 2007 1 © 2007 Daniel Carrillo 2 To my parents 3 ACKNOWLEDGMENTS I am grateful to my mayor professor, Dr. Jorge Peña, for his continued support and guidance during my time as a graduate student of the University of Florida. I also want to thank the other members of my supervisory committee, Dr. John L. Capinera and Dr. Michael. E. Rogers; their critiques and suggestions made substantial improvements to this study. I thank Rita, David, Jose, and Zaragoza, not only for their support while conducting my research, but also for helping me in many aspects of my personal life in Florida. I am grateful to Dr. Michael Scharf and Dr. Howard Frank for always being available, with a positive attitude, to answer my questions. I thank my family for their loving encouragement, which motivated me to complete my study. 4 TABLE OF CONTENTS page ACKNOWLEDGMENTS ...............................................................................................................4 LIST OF TABLES...........................................................................................................................7 LIST OF FIGURES .........................................................................................................................8 ABSTRACT.....................................................................................................................................9 CHAPTER 1 INTRODUCTION ..................................................................................................................11 Baseline Information about Diaprepes abbreviatus ...............................................................11 Biology of the Diaprepes root weevil .............................................................................12 Identification of Diaprepes abbreviatus..........................................................................15 Management of the Diaprepes root weevil .....................................................................16 Classical Biological Control of D. abbreviatus with Egg Parasitoids....................................24 Objectives of Master of Science Thesis Research..................................................................31 2 EFFECT OF HOST PLANTS ON SUCCESSFUL PARASITISM OF Haeckeliania sperata (HYMENOPTERA: TRICHOGRAMMATIDAE) ON Diaprepes abbreviatus (COLEOPTERA: CURCULIONIDAE) EGGS .....................................................................33 Introduction.............................................................................................................................33 Material and Methods.............................................................................................................35 Experiment1. Determining the Successful Parasitism of H. sperata on D. abbreviatus Eggs on Different Host Plants..................................................................36 Experiment 2. Effect of Leaf Trichomes on the Searching Behavior of H. sperata. ......37 Experiment 3. The Relationship of Searching Speed, Trichome Density and Leaf Thickness to Parasitism................................................................................................39 Results.....................................................................................................................................40 Experiment1. Determining the Successful Parasitism of H. sperata on D. abbreviatus Eggs on Different Host Plants..................................................................40 Experiment 2. Effect of Leaf Trichomes on the Searching Behavior of H. sperata. ......41 Experiment 3. The Relationship of Searching Speed, Trichome Density and Leaf Thickness to Parasitism................................................................................................42 Discussion...............................................................................................................................43 3 RELATIVE SUSCEPTIBILITY OF Haeckeliania sperata TO PESTICIDES USED IN CITRUS ..................................................................................................................................46 Introduction.............................................................................................................................46 Materials and Methods ...........................................................................................................49 Results.....................................................................................................................................51 5 Discussion...............................................................................................................................56 APPENDIX. CHECKLIST OF ENTIMINAE SCHROEDER 1823 (COLEOPTERA CURCULIONIDAE) SPECIES AND KEY TO SOME SPECIES PRESENT IN FLORIDA...............................................................................................................................63 LIST OF REFERENCES...............................................................................................................73 BIOGRAPHICAL SKETCH .........................................................................................................84 6 LIST OF TABLES Table page 2-1. Effect of leaf trichomes on the searching behavior of H. sperata. ....................................42 2-2. Relationship of searching speed, trichome density and leaf thickness to parasitism. Multiple regression analysis of the effect of searching speed, trichome density and leaf thickness on mean percent of parasitism of H. sperata on D. abbreviatus eggs laid on six host plants.........................................................................................................43 3-1. List of pesticides tested on H. sperata, including trade name, class, active ingredient, application rate, label concentration, and bioassay concentrations. ..................................51 3-2. Lethal Time (50 and 90) of H. sperata exposed to of 4 concentrations of selected pesticides............................................................................................................................53 3-3. Lethal Concentrations (50 and 90) at 12, 24 and 48 hours after Haeckeliania sperata adults were exposed to leaf disks treated with seven pesticides at four different concentrations. ...................................................................................................................54 A-1. Codes for Florida Counties. ...............................................................................................67 7 LIST OF FIGURES Figure page 1-1. General scheme of the main strategies proposed for management of D. abbreviatus in citrus...............................................................................................................................16 2-1. Effect of host plant on successful parasitism of D. abbreviatus eggs by H. sperata. No-Choice tests on six host plants and control treatment (wax paper). Different letters represents significant differences, Tukey (P<0.05). Error bars represent the standard error. ....................................................................................................................41 3-1. Percent mortality of H. sperata 24 hours after exposure to four different concentrations of pesticide residues on lime leaves. The concentrations for each pesticide consisted of a dilution series using the label rate for field applications as the starting concentration.........................................................................................................55 A-1. Myllocerus undatus A. Postocular lobe B. Femora tooth C. Adult ..................................68 A-2. Pachnaeus litus A. Postocular vibrissae B. Base of Elytra C. Adult.................................69 A-3. Diaprepes abbreviatus A. Postocular setae B. Mandible scar C. Adult............................70 A-4. Artipus floridanus (A &B) Lachnopus floridanus (C) A.Longitudinal sulcus B. Adult C. Adult..............................................................................................................................72 8 Abstract of Thesis Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Master of Science EFFECT OF HOST PLANTS AND PESTICIDES ON PARASITISM OF HAECKELIANIA SPERATA ON DIAPREPES ABBREVIATUS By Daniel Carrillo December 2007 Chair: Jorge E. Peña Major Department: Entomology and Nematology Two investigations were conducted to determine the effect of host plants and pesticides on Haeckeliania sperata (Hymenoptera: Trichogrammatidae), a gregarious egg-endoparasitoid that was imported to Florida as a biological control agent of Diaprepes abbreviatus (Coleoptera: Curculionidae). The first study hypothesized that the reproductive success of H. sperata is affected by the host plants of D. abbreviatus. Six host plants with varying degrees of pubescence were used to determine successful parasitism and the effect of leaf trichomes on the searching behavior of H. sperata. Haeckeliania was able to parasitize Diaprepes eggs laid on the six host plants; however, the plants with a high leaf trichome density had a lower percent of parasitism than the plants with smoother
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