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Biological Control of Halyomorpha Halys (Hemiptera: Pentatomidae) Using Native Natural Enemies in Michigan

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Biological Control of Halyomorpha Halys (Hemiptera: Pentatomidae) Using Native Natural Enemies in Michigan BIOLOGICAL CONTROL OF HALYOMORPHA HALYS (HEMIPTERA: PENTATOMIDAE) USING NATIVE NATURAL ENEMIES IN MICHIGAN By Kristin Rae Poley A THESIS Submitted to Michigan State University in partial fulfillment of the requirements for the degree of Entomology – Master of Science 2017 ABSTRACT BIOLOGICAL CONTROL OF HALYOMORPHA HALYS (HEMIPTERA: PENTATOMIDAE) USING NATIVE NATURAL ENEMIES IN MICHIGAN By Kristin Rae Poley The goal of this thesis was to investigate top-down pressures that exist at the beginning of the biological invasion process and to translate this into potential sources of biological control for a novel pest in Michigan’s agroecosystems. Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) is an invasive agricultural pest and the potential for a biological control program that utilizes existing natural enemies for H. halys is currently unknown. I deployed sentinel egg masses under video surveillance to determine a baseline frequency of natural enemy activity. Six predators were observed attacking eggs. Forficulidae attacked the highest number of eggs, followed by Gryllidae, then Miridae. Parasitoids were less prevalent than predators, occurring only in the first year. We found the baseline frequency of natural enemy activity to be a minimum of 2.2% and a maximum of 3.1% when considering eggs that were likely missing due to natural enemy activity. I then selected predators we observed and determined their functional response to H. halys eggs in a laboratory environment. Four generalist predators- Acheta domesticus L. (Gryllidae), Melanoplus femurrubrum DeGeer (Acrididae), Orius insidiosus Say (Anthocoridae), and Conocephalus fasciatus DeGeer (Tettigoniidae)- were tested against four densities of H. halys eggs. A. domesticus was the only predator that exhibited a Type II response with viable estimates of handling time and attack rate produced, suggesting the potential to be a density dependent mortality factor when H. halys egg densities are low. The remaining predators exhibited a Type I response and are unlikely to be a stabilizing force in H. halys population dynamics. ACKNOWLEDGMENTS I must first thank Dr. Matt Grieshop, my graduate advisor, for the opportunity to work in the Organic Pest Management lab and for convincing me that entomology is a wonderful discipline. I would also like to thank my advisory committee members, Dr. Ernest Delfosse (Entomology) and Dr. Anne Nielsen (Entomology, Rutgers University) for their guidance throughout my program. Thank you to the Organic Pest Management lab undergraduates for their hard work, patience, and willingness to watch thousands of hours of video: Morgan Burnette, Mirijam Garske, Mike Mueller, Bekki Reneker, Abby Bryson, Sean Evans, and Olivia Simaz. Many, many thanks to Lindsey Mason, without whom I would not have finished my research, nor had so much fun collecting insects. Thank you to Dr. Christie Bahlai for statistical consultation and code. Thank you to my fellow Entomology graduate students, especially those on the Linnaean Games team: Marissa Schuh, Dan Hulbert, Dan Gibson, and Courtney Larson – back-to-back champions! Thank you to Jason Matlock and Paul Owen-Smith for your comedic relief and advice. Thanks to Koppert Biological Systems (Howell, MI) for donation of predators in support of my research. I would like to thank the USDA NIFA OREI grant 2012-51300-20097 for funding my research and to the Entomology Department staff for their timely and invaluable support. I owe my deepest gratitude to my parents, Jim and Kim for their support, and to my husband Nathan for his encouragement, support, and understanding. I would not be here if it weren’t for your love. Finally, thank you to Picea, you always knew just when I needed a little extra warmth. iii TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................... vi LIST OF FIGURES ................................................................................................................... vii CHAPTER 1 ................................................................................................................................. 1 Introduction .................................................................................................................................. 1 1.1. Pest management tactics ................................................................................................ 2 1.2. Halyomorpha halys ........................................................................................................ 4 1.3. Impact ............................................................................................................................ 5 1.4. Insecticidal control of Halyomorpha halys .................................................................... 9 1.5. Organic management tactics ........................................................................................ 11 1.6. Biological control of Pentatomidae ............................................................................. 13 1.7. Biological control of Halyomorpha halys ................................................................... 17 1.8. Monitoring ................................................................................................................... 19 1.9. Research objectives ..................................................................................................... 20 CHAPTER 2 ............................................................................................................................... 22 Monitoring for natural enemies of Halyomorpha halys using video surveillance in Michigan ..................................................................................................................................................... 22 1. Introduction ....................................................................................................................... 22 2. Materials and Methods ..................................................................................................... 24 2.1. Laboratory colony ........................................................................................................ 25 2.2. Sentinel egg deployment .............................................................................................. 25 2.3. Video recording ........................................................................................................... 27 2.4. Data analysis ................................................................................................................ 28 2.4.1. Natural enemy impact ....................................................................................... 28 2.4.2. Natural enemy community ................................................................................ 29 2.4.3. Natural enemy behavior .................................................................................... 29 3. Results ................................................................................................................................ 30 3.1. Natural enemy impact .................................................................................................. 30 3.2. Natural enemy community ........................................................................................... 36 3.3. Natural enemy behavior ............................................................................................... 43 4. Discussion .......................................................................................................................... 47 CHAPTER 3 ............................................................................................................................... 54 Functional response of generalist predators to Halyomorpha halys eggs under laboratory conditions .................................................................................................................................... 54 1. Introduction ....................................................................................................................... 54 2. Materials and Methods ..................................................................................................... 56 2.1. Arthropod culture ......................................................................................................... 56 2.2. Preliminary predator testing ......................................................................................... 57 2.3. Functional response ..................................................................................................... 58 iv 2.4. Data analysis ................................................................................................................ 62 2.4.1. Attack rate and handling time ........................................................................... 62 2.4.2. Model fitting ..................................................................................................... 62 3. Results ................................................................................................................................ 64 3.1. Preliminary predator testing ......................................................................................... 64 3.2. Attack rate and handling time ...................................................................................... 64 3.3. Functional response ....................................................................................................
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