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Christopher J Geden (Chris)

Research Entomologist

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Telephone: 352-318-1936
http://www.ars.usda.gov/saa/cmave/mfru/cgeden

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Education | Research Experience
Memberships | Committee Assignments
Research Accomplishments | Honors and Awards
International Invitations | Publications

Research Specialties

Biology and management of muscoid flies and other pests of veterinary importance, with emphasis on biological control and behavior-based approaches.

Education

B.S.
Biology, Boston College, 1976.
M.S.
Entomology, University of Massachusetts, Amherst, 1979.
Ph.D.
Entomology, University of Massachusetts, Amherst, 1983.

Research Experience

1976 - 1983
Research Assistant, University of Massachusetts, Amherst
1984 - 1987
Postdoctoral Associate, North Carolina State University, Raleigh
1987 - 1992
Research Associate, Cornell University, Ithaca, NY
1992 - Pres
Research Entomologist, USDA, ARS, Gainesville, FL

Membership in Professional Societies

  • Society for Invertebrate Pathology
  • Entomological Society of America
  • Society for Vector Ecology

Scientific Office and Committee Assignments

  • Subject editor, Journal of Medical Entomology (2015-present)
  • Subject editor, Veterinary Parasitology (2021-present)
  • ESA program committee, 2020-2022 (co-chair 2021)
  • MUVE representative to the Governing Board of ESA (2014-2020)
  • Medical, Urban and Veterinary Entomology section of ESA: Vice President (2011), President (2012)
  • Editorial Board, Journal of Medical Entomology (2007-2011, 2020-present)
  • Visiting Scientist, Aarhus University, Department of Integrated Pest Management, Lyngby, Denmark, 2008.
  • Courtesy Graduate Faculty member, UF Dept of Entomology and Nematology, 1994-present.
  • Member, multistate projects S1005, S1006, S1030 (management of veterinary pests) 1999-present
  • Technical advisor/consultant: Armed Forces Pest Management Board, Association of Natural Biocontrol Producers, Danish Ministry of Agriculture, National Biological Control Institute, International Atomic Energy Agency.
  • USDA NRI Review Panel 2004, 2005
  • USDA CAR/RAMP Review Panel 2003
  • Co-organizer - Livestock Insects Workers Conference 2000 (St. Augustine, FL) and 1990 (Ithaca, NY)
  • Chair, multistate project S-267, Biological control of selected arthropods, 1998
  • Chaired a committee of a national workshop to review IPM in animal agriculture, Lincoln, NE, 1994. Co-edited the 245-page proceedings of the workshop.
  • Editorial Board, Annals of the Entomological Society of America, 1989-1993.

Selected Research Accomplishments

  • Discovered the presence of bovine eye parasites (Thelazia gulosa and Thelazia skrjabini) in the US and elucidated their life cycle in cattle and in the face fly vector (Musca autumnalis).
  • Determined the ecological and behavioral factors that determine the effectiveness of house fly predators as biological control agents.
  • Conducted research on filth flies on dairies in that led to development of an effective bio-based IPM program for dairy farmers in the Northeast.
  • Compared methods for initiating epizootics of the fungus Entomophthora muscae in house fly populations on dairy farms.
  • Co-inventor of a mechanical barrier to prevent damage caused by litter beetle larvae to poultry facilities.
  • Discovered a pathogenic microorganism (Nosema muscidifuracis) infecting filth fly parasitoids; characterized the life cycle, identified the impact of infection on wasp fitness, and developed a disease management program.
  • Defined the ecological characteristics of native and exotic fly parasitoid species to determine the settings in which they would be most effective.
  • Compared the effectiveness and sensitivity of outdoor fly sampling methods and developed a new method to collect flies for fly-borne pathogen surveys.
  • Developed an insecticide-treated visual target for use as perimeter protection from immigrating flies.
  • Determined prevalence, transmission patterns, host range, and impact of salivary gland hypertrophy virus (SGHV) of adult house flies.

Honors, Awards, Funded Grants

  • Honors Graduate, Boston College, 1976
  • Research Fellow Award, Univ. of Massachusetts, Amherst 1981-1982
  • Harry A. Rosenfeld Award in Applied Entomology, 1982
  • While at Cornell, received various grants and industry contracts totaling $262,000, 1987-1992
  • USDA/NRI competitive grant, "Biology and Management of Parasitoid Disease", 1996-1999.
  • USDA, ARS Spot Award, 1998
  • USDA/NRI competitive grant, "A Novel Viral Pathogen for Biological Control of the House Fly, Musca domestica", 2008-2010.
  • Minnesota Department of Agriculture 2000-2002, "Exploration for Eurasion parasitoids of house flies"
  • USDA/SBIR, "Beauveria bassiana for control of litter beetles", 1999-2002.
  • US Poultry & Egg, "Using adult flies as autodissemination vehicles to deliver larval fly control agents". 2012
  • US/Israel BARD grant (with co-PI Elad Chiel), "Development of sustainable fly management tools in an era of global warming", 2014-2017.
  • Lifetime Achievement Award in Veterinary Entomology (sponsored by Bayer Animal Health), July 2015.
  • USDA/SBIR with Beneficial Insectary “Developing rearing techniques for Tachinaephagus zealandicus, a housefly biological control agent, using Hydrotaea aenescens as the rearing host” (2019-2021)
  • US Poultry and Egg, “Improved fly control on poultry facilities with microbial products” (2017-2019)
  • USDA/SARE “Development of educational and pest control tools for small flock and organic poultry producers” (2019-2021)
  • Deployed Warfighter Protection Program “New bait for fly control” (2019-2022)
  • Honorary Member, Entomological Society of America (2021)

Invited International Presentations

  • "Biological control of flies on poultry farms", 5th Symposium on Biological Control (Siconbiol V), Foz do Iguacu, Brazil, 1996.
  • "Impact and management of Nosema disease in parasitoids". Keynote presentation in the Microsporidia section of the Society for Invertebrate Pathology meeting in the Netherlands, 2001.
  • "Diseases of parasitic Hymenoptera", 5th International Congress of Hymenopterists, Beijing, China, July 2002.
  • "Mass-rearing beneficial insects for biological control of flies". Workshop of the IOBC Global Working Group on Arthropod Mass Rearing and Quality Control, September 2003, Montpellier, France.
  • "Biological control of pests of animal husbandry". Keynote presentation, International Conference on Implementation of Biological Control in Temperate Regions, Flakkebjerg, Denmark, November 2005.
  • "Pathogens for control of beetles and flies in poultry systems", Seminar presented to the Department of IPM, Danish Institute of Agricultural Sciences, Lyngby, Denmark, November 2005.
  • "Discovery of novel pathogens and parasitoids of muscoid flies", Seminar presented at the Royal Veterinary Institute, University of Copenhagen, Denmark, August 2008.
  • "Diapriid and viral natural enemies of stable flies in the U.S. and Denmark". Seminar presented at Aarhus University, Denmark, September 2008.
  • "Status of our understanding of SGH virus transmission in Musca domestica". IAEA Workshop "Improving SIT for Tsetse Flies through Research on their Symbionts and Pathogens", February 16-20, 2009, Bobo-Dioulasso, Burkina Faso.
  • "Prospects for development of salivary gland hypertrophy virus of Musca domestica as a population management tool". 5th International Conference on Biopesticides: Stakeholders' Perspectives, New Delhi, India, April 26-30, 2009.
  • "House fly SGHV: Prevalence in Denmark, host range, comparison of Florida and Danish isolates, and update on transmission". IAEA Workshop "Improving SIT for Tsetse Flies through Research on their Symbionts and Pathogens", July 26-30, 2010, Nairobi, Kenya.
  • "Status of microbial pesticides for management of house flies". 3rd International Biopesticides Conference (Biocicon), November 38-30, 2011. Palayamkottai, India.
  • "Attractive devices for house fly control". Seminar presented at the Centre for Research in Medical Entomology, December 2011, Madurai, India.
  • "Effect of SGHV on Stomoxys calcitrans", IAEA Workshop "Improving SIT for Tsetse Flies through Research on their Symbionts and Pathogens", February, 2012, Vienna, Austria.
  • "Improved rearing methods for filth fly parasitoids", IOBC conference Emerging Opportunities for the Mass Production & Quality Assurance of Invertebrates, November 6-8, 2013, Bangalore, India.
  • "Preparing for climate change effects on filth flies and their associated diseases". Plenary address, 3rd International Congress on Global Warming and Biodiversity of Insects: Management and Conservation Strategies, Nov. 26-28, 2013, Coimbatore, India.
  • "House fly management with viral and botanical agents". Keynote address, 4th International Biopesticides Conference (Biocicon), November 28-30, 2013, Palayamkottai, India.
  • While in India in November 2013, also gave five invited seminars and training lectures at Bharathiar University, Tamil Nadu Agricultural University (both in Coimbatore) and Bharathidesan University in Tiruchirappali.
  • “Prospects for biological control of stable flies”. International Workshop on Stable Flies, April 16-20, 2018, San Jose, Costa Rica.
  • “Microbial control of filth flies using fungal, viral, and bacterial agents”. International Conference on Biological Control, September 27-29, 2018, Bangalore, India.

Publications

Geden, C. J. and J. G. Stoffolano, Jr. Bovine thelaziasis in Massachusetts. Cornell Veterinarian 70: 344-359. 1980.

Geden, C. J. and J. G. Stoffolano, Jr. Geographic range and temporal patterns of parasitization of Musca autumnalis (Diptera: Muscidae) by Thelazia sp. (Nematoda: Spirurata) in Massachusetts, with observations on Musca domestica (Diptera: Muscidae) as an unsuitable intermediate host. J. Med. Entomol. 18: 449-456. 1981.

Geden, C. J. and J. G. Stoffolano, Jr. Development of the bovine eyeworm Thelazia gulosa (Railliet and Henry) in experimentally infected, female Musca autumnalis DeGeer. J. Parasitol. 68: 287-292. 1982.

Geden, C. J. and J. G. Stoffolano, Jr. Nematode parasites of Diptera other than black flies and mosquitoes. Pages 849-898 in Plant and Insect Nematodes, W. J. Nickle (ed.). Marcel Dekker, New York, 925 pp. 1984. (Book Chapter)

Geden, C. J., R. C. Axtell and W. M. Brooks. Susceptibility of the lesser mealworm, Alphitobius diaperinus (Coleoptera: Tenebrionidae) to the entomogenous nematodes Steinernema feltiae, S. glaseri (Steinernematidae) and Heterorhabditis heliothidis (Heterorhabditidae). J. Entomol. Sci. 20: 331-339. 1985.

Geden, C. J., R. C. Axtell and W. M. Brooks. Susceptibility of the house fly, Musca domestica (Diptera: Muscidae) to the entomogenous nematodes Steinernema feltiae, S. glaseri (Steinernematidae) and Heterorhabditis heliothidis (Heterorhabditidae). J. Med. Entomol. 23: 326-332. 1986.

Geden, C. J. and J. G. Stoffolano, Jr. Succession of manure arthropods at a poultry farm in Massachusetts, with notes on Carcinops pumilio sex ratios, ovarian condition and body size. J. Med. Entomol. 24: 214-222. 1987.

Geden, C. J., J. G. Stoffolano,Jr. and J. S. Elkinton. Prey-mediated dispersal behavior of the predaceous histerid, Carcinops pumilio. Environ. Entomol. 16: 415-419. 1987.

Geden, C. J., T. D. Edwards, J. J. Arends and R. C. Axtell. Efficacies of mixtures of insecticides and disinfectants. Poultry Science 66: 659-665. 1987.

Geden, C. J., J. J. Arends and R. C. Axtell. Field trials of Steinernema feltiae (Nematoda: Steinernematidae) for control of Alphitobius diaperinus (Coleoptera: Tenebrionidae) in commercial broiler and turkey houses. J. Econ. Entomol. 80: 136-141. 1987.

Geden, C. J. and R. C. Axtell. Factors affecting climbing and tunneling behavior of the lesser mealworm, Alphitobius diaperinus (Coleoptera: Tenebrionidae). J. Econ. Entomol. 80: 1197-1204. 1987.

Geden, C. J. and J. G. Stoffolano, Jr. Dispersion patterns of arthropods associated with poultry manure in enclosed houses in Massachusetts: spatial distribution and effects of manure moisture and accumulation time. J. Entomol. Sci. 23: 136-148. 1988.

Geden, C. J., R. E. Stinner and R. C. Axtell. Predation by predators of the house fly in poultry manure: effects of predator density, feeding history, interspecific interference, and field conditions. Environ. Entomol. 17: 320-329. 1988.

Geden, C. J. and R. C. Axtell. Predation by Carcinops pumilio (Coleoptera: Histeridae) and Macrocheles muscaedomesticae (Acarina: Macrochelidae) on the house fly (Diptera: Muscidae): functional response, and effects of temperature and availability of alternative prey. Environ. Entomol. 17: 739-744. 1988.

Geden, C. J. and R. C. Axtell. Effect of temperature on nematode (Steinernema feltiae) treatment of soil for control of lesser mealworm in turkey houses. J. Econ. Entomol. 81: 800-803. 1988.

Sukarsih, F., C. J. Geden, and R. C. Axtell. Filth fly oviposition and larval development in poultry manure of various moisture levels. J. Entomol. Sci. 24: 224-231. 1989.

Geden, C. J., D. C. Steinkraus, and D. A. Rutz. Poecilochirus monospinosus (Acarina: Parasitidae), a predator of house fly immatures: new locality records from New York and Massachusetts. J. New York Entomol. Soc. 97: 483-485. 1989.

Geden, C. J. The role of coleopteran and acarine predators in house fly population regulation in poultry production facilities. Pp. 177-200 in: Biocontrol of Arthropods Affecting Livestock and Poultry, D. A. Rutz and R. A. Patterson (eds). Westview Press, Boulder. 1990. (Book Chapter)

Geden, C. J., R. E. Stinner, D. Kramer and R. C. Axtell. MACMOD, a simulation model of Macrocheles muscaedomesticae (Acarina: Macrochelidae) population dynamics and rates of predation on immature house flies (Diptera: Muscidae). Environ. Entomol. 19: 578-586. 1990.

Steinkraus, D. C., C. J. Geden and D. A. Rutz. First report of the natural occurrence of Beauveria bassiana (Moniliales: Moniliaceae) in Musca domestica (Diptera: Muscidae). J. Med. Entomol. 27: 309-312. 1990.

Geden, C. J., D. A. Rutz, and D. A. Bishop. Cattle lice on dairy cattle in New York: seasonal population changes, and effects of housing conditions on infestations of young stock. J. Econ. Entomol. 83: 1435-1438. 1990.

Geden, C. J., D. A. Rutz, D. C. Steinkraus, S. J. Long, and W. L. Shoop. Susceptibility of insecticide-susceptible and wild house flies (Diptera: Muscidae) to abamectin on whitewashed and unpainted wood. J. Econ. Entomol. 83: 1935-1939. 1990.

Scott, J. G., K. Dong, C. J. Geden, and D. A. Rutz.. Evaluation of the biochemical basis of insecticide selectivity between host and parasitoid species. Environ. Entomol. 19: 1722-1725. 1991.

Steinkraus, D. C., C. J. Geden, and D. A. Rutz. Susceptibility of lesser mealworm (Coleoptera: Tenebrionidae) to Beauveria bassiana: effects of host stage, formulation, substrate and host passage. J. Med. Entomol. 28: 314-321. 1991.

Scott, J. G, N. Liu, C. J. Geden, and D. A. Rutz. Comparative toxicity of seven insecticides to immature stages of Musca domestica (Diptera: Muscidae) and two of its most important biological control agents: Muscidifurax raptor and Spalangia cameroni (Hymenoptera: Pteromalidae). J. Econ. Entomol. 84: 776-779. 1991.

Steinkraus, D. C., W. M. Brooks, and C. J. Geden. Discovery of the neogregarine Farinocystis tribolii and a eugregarine in the lesser mealworm, Alphitobius diaperinus. J. Invert. Pathol. 59: 203-205. 1992.

Geden, C. J., L. Smith, S. J. Long, and D. A. Rutz. Rapid deterioration of searching behavior, host destruction, and fecundity of the parasitoid Muscidifurax raptor (Hymenoptera: Pteromalidae) in culture. Annals, Entomol. Soc. Amer. 85: 179-187. 1992.

Geden, C. J., D. A. Rutz, J. G. Scott, and S. J. Long. Susceptibility of house flies (Diptera: Muscidae) and five pupal parasitoids (Hymenoptera: Pteromalidae) to abamectin and seven commercial insecticides. J. Econ. Entomol.85: 435-440. 1992.

Zchori-Fein, E., C. J. Geden, and D. A. Rutz. Microsporidioses of pteromalid parasitoids of muscoid flies. J. Invert. Pathol. 60: 292-298. 1992.

Geden, C. J., D. C. Steinkraus, R. W. Miller and D. A. Rutz. Suppression of house flies (Diptera: Muscidae) on New York and Maryland dairies using releases of Muscidifurax raptor (Hymenoptera: Pteromalidae) in an integrated management program. Environ. Entomol. 21: 1419-1426. 1992.

Miller, R. W., D. A. Rutz, L. G. Pickens. and C. J. Geden. Evaluation of traps and Muscidifurax raptor parasitoids to manage house flies and stable flies on dairy farms. J. Agr. Entomol. 10: 9-19. 1993.

Steinkraus, D. C., C. J. Geden, and D. A. Rutz. Prevalence of Entomophthora muscae (Cohn) Fresenius (Zygomycetes: Entomophthoraceae) in house flies (Diptera: Muscidae) on dairy farms in New York, and induction of epizootics. Biological Control 3: 93-110. 1993.

Geden, C. J., D. C. Steinkraus, and D. A. Rutz. Evaluation of two methods for release of Entomophthora muscae (Entomophthorales: Entomophthoraceae) to infect house flies (Diptera: Muscidae) on dairy farms. Environ. Entomol. 20: 1201-1208. 1993.

Barnard, D. R. and C. J. Geden. Influence of larval density and temperature in poultry manure on development of the house fly (Diptera: Muscidae). Environ. Entomol. 22: 971-977. 1993.

Becnel, J. J. and C. J. Geden. Description of a new species of microsporidia from Muscidifurax raptor (Hymenoptera: Pteromalidae), a pupal parasitoid of muscoid flies. J. Eukaryotic Microbiol. 41: 236-243. 1994.

Watson, D. W., C. J. Geden, S. J. Long, and D. A. Rutz. Efficacy of Beauveria bassiana for controlling house flies and stable flies (Diptera: Muscidae). Biological Control. 5: 405-411. 1995.

Geden, C. J., S. J. Long, D. A. Rutz, and J. J. Becnel. Nosema disease of the parasitoid Muscidifurax raptor (Hymenoptera: Pteromalidae): prevalence, patterns of transmission, management, and impact. Biological Control 5: 607-614. 1995.

Geden, C. J., D. C. Steinkraus, and D. A. Rutz. Virulence of different isolates and formulations of Beauveria bassiana for house flies and the parasitoid Muscidifurax raptor. Biological Control. 5: 615-621. 1995.

Geden, C. J. Modeling host attacks and progeny production of Spalangia gemina, Spalangia cameroni, and Muscidifurax raptor (Hymenoptera: Pteromalidae) at constant and variable temperatures. Biological Control 7:172-178. 1996.

Geden, C. J. Development models for the filth fly parasitoids Spalangia gemina, S. cameroni, and Muscidifurax raptor (Hymenoptera: Pteromalidae) under constant and variable temperatures. Biological Control 9:185-192. 1997.

Geden, C. J. Evaluation of Paraiotonchium muscadomesticae (Nematoda: Tylenchida: Iotonchiidae), a potential biological control agent of the house fly (Diptera: Muscidae). Biological Control 10: 42-47. 1997.

Bernier, U. R., D. A. Carlson, and C. J. Geden. Gas chromatography/ mass spectrometry analysis of the cuticular hydrocarbons from parasitic wasps of the genus Muscidifurax. J. Am. Soc. Mass Spectrom. 9:320-332. 1998.

Geden, C. J., U. R. Bernier, D. A. Carlson, and B. D. Sutton. Identification of Muscidifurax spp., parasitoids of muscoid flies, by composition patterns of cuticular hydrocarbons. Biological Control 12: 200-207. 1998.

Geden, C. J., J. J. Arends, D. A. Rutz, and D. C. Steinkraus. Laboratory evaluation of Beauveria bassiana (Monilialies: Moniliaceae) against the lesser mealworm, Alphitobius diaperinus (Coleoptera: Tenebrionidae), in poultry litter, soil, and a pupal trap. Biological Control. 13: 71-77. 1998.

Geden, C. J. Host location by house fly (Diptera: Muscidae) parasitoids in poultry manure at different moisture levels and host densities. Environmental Entomology 28: 755-760. 1999.

Geden, C. J., J. A. Hogsette, and R. D. Jacobs. Effect of airflow on house fly (Diptera: Muscidae) distribution in poultry houses. J. Economic Entomology 92: 416-420. 1999.

Carlson, D. A., C. J. Geden, and U. R. Bernier. Identification of pupal exuviae of Nasonia vitripennis and Muscidifurax raptorellus parasitoids using cuticular hydrocarbons. Biological Control 15: 97-106. 1999.

Carlson, D. A. and C. J. Geden. Insect barrier system for prevention of the passage of crawling insects. U. S. Patent No. 6,223,463 B1. Issued May 1, 2001. (Patent)

Geden, C. J. and D. A. Carlson. Mechanical barrier for preventing climbing by lesser mealworm (Coleoptera: Tenebrionidae) and hide beetle (Coleoptera: Dermestidae) larvae in poultry houses. J. Econ. Entomol. 94: 1610-1616. 2001.

Geden, C. J., J.J. Arends, R.C. Axtell, D. R. Barnard, D. M. Gaydon, L. A. Hickle, J. A. Hogsette, W. F. Jones, B. A. Mullens, M. P. Nolan, Jr., M.P. Nolan III, J. J. Petersen, D.C. Sheppard. Research and Extension Needs for Poultry IPM. In: Geden, C. J. and J. A. Hogsette (eds). (Online Publication) 2001. (Book Chapter)

Geden, C. J. and J. A. Hogsette (eds). (Online Publication) 2001. (Book)

Ferreira de Almeida, M. A. F., C. J. Geden and A. Pires do Prado. Influence of feeding treatment, host density, temperature and cool storage on attack rates of Tachinaephagus zealandicus (Hymenoptera: Encyrtidae). Environ. Entomol. 31: 732-738. 2002.

Ferriera de Almeida, M.A.F., C. J. Geden, C. K. Boohene, J. J. Becnel, and A. Pires do Prado. 2002. Microsporidiosis of Tachinaephagus zealandicus (Hymenoptera: Encyrtidae). Mem. Inst. Oswaldo Cruz 97: 527-530. 2002.

Ferreira de Almeida, M.A.F., A. Pires do Prado and C. J. Geden. Influence of temperature on development time and longevity of Tachinaephagus zealandicus (Hymenoptera: Encyrtidae), and effects of nutrition and emergence order on longevity. Environ. Entomol. 31: 375-380. 2002.

Geden, C. J. Effect of habitat depth on host location by five species of parasitoids (Hymenoptera: Pteromalidae, Chalcididae) of house flies, Musca domestica L. (Diptera: Muscidae), in three types of substrates. Environ. Entomol. 31: 411-417. 2002.

Boohene, C. K., C. J. Geden and J. J. Becnel. Development of microsporidia-infected Muscidifurax raptor (Hymenoptera: Pteromalidae) at different temperatures. Biol. Control 26: 1-7. 2003.

Geden, C. J. and D. C. Steinkraus. Evaluation of three formulations of Beauveria bassiana for control of lesser mealworm and hide beetle in Georgia poultry houses. J. Econ. Entomol. 96: 1602-1608. 2003.

Geden, C. J., M. A. Ferreira de Almeida and A. Pires do Prado. Effects of Nosema disease on fitness of the parasitoid Tachinaephagus zealandicus (Hymenoptera: Encyrtidae). Environ. Entomol. 32:1139-1145. 2003.

Boohene, C. K., C. J. Geden, and J. J. Becnel. Evaluation of remediation methods for Nosema disease in Muscidifurax raptor (Hymenoptera: Pteromalidae). Environ. Entomol. 32:1146-1153. 2003.

Geden, C. J. Methods for monitoring outdoor populations of house flies, Musca domestica. J. Vector Ecol. 30: 244-250. 2005.

Carlson, D. A., F. Mramba, B. D. Sutton, U. R. Bernier, C. J. Geden, and K. Mori. Sex pheromone of the tsetse species, Glossina austeni: isolation and identification of natural hydrocarbons, and bioassay of synthesized compounds. Med. Vet. Entomol. 19: 470-479. 2005.

Carlson, D. A., J. A. Hogsette, D. L. Kline, C. J. Geden, and R. K. VanderMeer. Prevention of mosquitoes (Diptera: Culicidae) and house flies (Diptera: Muscidae) from entering simulated aircraft with commercial air curtain units. J. Econ. Entomol. 99: 182-193. 2006

Geden, C. J. and J. A. Hogsette. Suppression of house flies (Diptera: Muscidae) in Florida poultry houses by sustained releases of Muscidifurax raptorellus and Spalangia cameroni (Hymenoptera: Pteromalidae). Environ. Entomol. 35: 75-82. 2006.

Geden, C. J., R. D. Moon, and J. F. Butler. Host ranges of six solitary filth fly parasitoids (Hymenoptera: Pteromalidae, Chalcididae) from Florida, Eurasia, Morocco and Brazil. Environ. Entomol. 35: 405-412. 2006.

Geden, C. J. Biological Control of Pests in Livestock Production. In: Hansen. L. and T. Steenberg, editors. "Implementation of biocontrol in practice in temperate regions - present and near future". 2006. (Book chapter).

Geden, C. J. Visual targets for capture and management of house flies, Musca domestica. J. Vector Ecol. 31: 152-157. 2006.

Linthicum, K., S.A. Allan, D.R. Barnard, J.J. Becnel. U.R. Bernier, S.C.Britch, G.G. Clark.M.F. Cooperband, C.J. Geden, J.A. Hogsette, D.L. Kline, R.M. Perreira, Y.W. Pridgeon, B.P. Quinn, J.F. Reinert, C.H. Welch, L. Zhao. Mosquito and Fly Control Research by the USDA-ARS Center for Medical, Agricultural and Veterinary Entomology (CMAVE) in the Deployed War-Fighter Protection (DWFP) Program. California Mosquito and Vector Control Association Proceedings. 2007.

Geden, C. J. and P. E. Kaufman. Development of Spalangia cameroni and Muscidifurax raptor on live house fly pupae and pupae killed by heat shock, irradiation, and cold. Environ. Entomol. 36: 34-39. 2007.

Quinn, B., U. R. Bernier, C. J. Geden, J. A. Hogsette, and D. A. Carlson. Analysis of extracted components in blackstrap molasses. J. Chromat., Series A. 1139: 279-284. 2007.

Deacutis, J.M., C.A. Leichter, A.C. Gerry, D.A. Rutz,. W.D. Watson, C.J. Geden, and J.G. Scott. Susceptibility of field-collected houseflies to spinosad before and after a season of use. J. Agricultural Urban Entomol. 23: 105-110. 2007.

Rinkevich, F.D., R.L. Hamm, C.J. Geden and J.G. Scott. Dynamics of insecticide resistance alleles in house fly populations from New York and Florida. Insect Biochem. Mol. Biol. 37:550-558. 2007.

Holt, P. S., C. J. Geden, R. W. Moore, and R. K. Gast. Isolation of Salmonella enterica serovar enteriditis from houseflies (Musca domestica) found in rooms containing Salmonella serovar enteriditis-challenged hens. Appl. Environ. Microbiol. 73: 6030-6035. 2007.

Lietze, V., C. J. Geden, P. Blackburn, and D G. Boucias. Effects of salivary gland hypertrophy virus on the reproductive behavior of the housefly, Musca domestica. Appl. Environ. Microbiol. 73: 6811-6818. 2007.

Geden C. J., V. Lietze, and D.G. Boucias. Seasonal prevalence and transmission of salivary gland hypertrophy virus of house flies (Diptera:Muscidae). J. Med. Entomol. 45: 42-51. 2008.

Linthicum, K., S.A. Allan, D.R. Barnard, J.J. Becnel. U.R. Bernier, D.A. Carlson, G.G. Clark. C.J. Geden, J.A. Hogsette, D.L. Kline. Overview of the mosquito research programs at the Unites States Department of Agriculture - Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology. Wing Beats 19 (1):31-36. 2008.

Geden, C. J., D. E. Szumlas and T.W. Walker. Evaluation of commercial and field-expedient baited traps for house flies, Musca domestica L. (Diptera: Muscidae). J. Vector Ecol. 34(1): 99-103. 2009.

Geden, C. J. and R.D. Moon. Host ranges of gregarious muscoid fly parasitoids: Muscidifurax raptorellus (Kogan and Legner) (Hymenoptera: Pteromlaidae), Tachinaephagus zealandicus Ashmead (Hymenoptera: Encyrtidae), and Trichopria nigra (Nees) (Hymenoptera: Diapriidae). Environ. Entomol. 38(3): 700-707. 2009.

Ascunce, M. S., S. Yang, C.J. Geden and D.D. Shoemaker. Twenty-three new microsatellite loci in the stable fly Stomoxys calcitrans (L.) (Diptera: Muscidae). Mol. Ecol. Resources 9, 271-273. 2009.

Lietze, V.U., K. Simms, T. Z. Salem, C. J. Geden, and D. G. Boucias. Transmission of MdSGHV among adult house flies, Musca domestica (Diptera: Muscidae), occurs via oral secretions and excreta. J. Invertebrate Pathol. 101:49-55. 2009.

Kaufman, P. E. and C. J. Geden. Development of Spalangia cameroni and Muscidifurax raptor (Hymenopter: Pteromalidae) on live and freeze-killed house fly (Diptera: Muscidae) pupae. Florida Entomologist 92: 492-496. 2009.

Kaufman, P. E., S. Nunez, R. S. Mann, C. J. Geden and M. E. Scharf. Nicotinoid and pyrethroid insecticide resistance in house flies (Diptera: Muscidae) collected from Florida dairies. Pest Manag. Sci 66: 290-294. 2010.

Prompiboon P, V-U Lietze J. S. Denton, C.J. Geden, T. Steenberg and D. Boucias. Musca domestica salivary gland hypertrophy virus, a globally distributed insect virus that infects and sterilizes female houseflies. Appl. Environ. Microbiol. 76: 994-998. 2010

Turell, M. J., D. J. Dohm, C. J. Geden, J. A. Hogsette, K. J. Linthicum. 2010. Potential for stable flies and house flies (Diptera: Muscidae) to transmit Rift Valley fever virus. J. Am. Mosq. Control Assoc. 26:445-448.

Lietze, V-U., A. M. M. Abd-Alla, M. Vreysen, C. J. Geden, and D. G. Boucias. 2011. Salivary gland hypertrophy viruses (SGHVs): a novel group of insect pathogenic viruses. Annual Review of Entomol. 56:63-80.

Geden, C. J., T. Steenberg, V.-U. Lietze, and D. G. Boucias. 2010. Salivary gland hypertrophy virus of house flies in Denmark: Prevalence, host range, and comparison with a Florida isolate. J. Vector Ecol. (in press).

Pitzer, J. B., P. E. Kaufman, C. J. Geden, and J. A. Hogsette. 2011. The ability of selected pupal parasitoids (Hymenoptera: Pteromalidae) to locate stable fly hosts in a soiled equine bedding substrate. Environ. Entomol. (in press).

Kaufman, P. E., S. C. Nunez, C. J. Geden and M. E. Scharf. 2011. Selection for resistance to imidacloprid in the house fly (Diptera: Muscidae). J. Econ. Entomol. (in press).

Pitzer, J. B. P. E. Kaufman, J. A. Hogsette, C. J. Geden and S. H. TenBroeck. 2010. Seasonal abundance of stable flies and filth fly pupal parasitoids (Hymenoptera: Pteromalidae) at Florida equine facilities. J. Econ. Entomol. (in press).

C. J. Geden, A. G. Maruniak, V.-U. Lietze, J. Maruniak, and D. G. Boucias. 2011. Impact of house fly salivary gland hypertrophy virus (MdSGHV) on a heterologous host, stable Fly (Stomoxys calcitrans). J. Med. Entomol. (in review).

Pitzer, J. B. P. E. Kaufman, J. A. Hogsette, C. J. Geden and S. H. TenBroeck. 2010. Seasonal abundance of stable flies and filth fly pupal parasitoids (Hymenoptera: Pteromalidae) at Florida equine facilities. J. Econ. Entomol. 104: 1108-1115.

Lietze, V-U., A. M. M. Abd-Alla, M. Vreysen, C. J. Geden, and D. G. Boucias. 2011. Salivary gland hypertrophy viruses (SGHVs): a novel group of insect pathogenic viruses. Annual Review of Entomol. 56:63-80.

Pitzer, J. B., P. E. Kaufman, C. J. Geden, and J. A. Hogsette. 2011. The ability of selected pupal parasitoids (Hymenoptera: Pteromalidae) to locate stable fly hosts in a soiled equine bedding substrate. Environ. Entomol. 40: 88-93.

Kaufman, P. E., S. C. Nunez, C. J. Geden and M. E. Scharf. 2011. Selection for resistance to imidacloprid in the house fly (Diptera: Muscidae). J. Econ. Entomol. 103: 1937-1942

Geden, C. J., A. G. Maruniak, V.-U. Lietze, J. Maruniak, and D. G. Boucias. 2011. Impact of house fly salivary gland hypertrophy virus (MdSGHV) on a heterologous host, stable fly (Stomoxys calcitrans). J. Med. Entomol. 48: 1128-1135

Geden, C. J., T. Steenberg, V.-U. Lietze, and D. G. Boucias. 2011. Salivary gland hypertrophy virus of house flies in Denmark: Prevalence, host range, and comparison with a Florida isolate. J. Vector Ecol. 36: 231-238.

Lietze, V.-U., C. J. Geden, M. A. Doyle, and D. G. Boucias. 2011. Transmission dynamics and persistence of MdSGHV in laboratory house fly (Musca domestica) populations. Appl. Environ. Microbiol. 78:311-317.

Geden, C. J. and G. G. Devine. 2012. Pyriproxyfen and house flies (Diptera: Muscidae): effects of direct exposure and use of flies as autodissemination vehicles for treating larval habitats. J. Med. Entomol. 49:606-13.

Lietze, V.U., J. E. Keesling, J. A. Lee, C. R. Vallejo, C. J. Geden, and D. G. Boucias. 2012. Muscavirus (MdHV) disease dynamics in house fly populations - How is this virus transmitted and has it potential as a biological control agent? J. Invertebrate Pathol. 112: 540-543.

Geden, C. J. 2012. Status of biopesticides for control of house flies. J. Biopesticides. 5 (Suppl.): 1-11.

Aldridge, R. L., W. Wayne Wynn, S. C. Britch , S. A. Allan , T. W. Walker , C. J. Geden, J. A. Hogsette, and K. J. Linthicum. 2013. High-throughput mosquito and fly bioassay system for natural and artificial substrates treated with residual insecticides. J. Am. Mosq. Control. Assoc. 29: 84-87.

Machtinger, E. T. and C. J. Geden. 2013. Host location by Spalangia cameroni (Hymenoptera: Pteromalidae) in equine associated substrates. Biological Control 65: 130-134.

Scott, J.G.,C. Leichter, F.D. Rinkevich, S.A. Harris, C. Su, L.C Aberegg, R. Moon, C.J. Geden, A.C. Gerry, D.B. Taylor, R.L. Byford, W. Watson, G. Johnson, D. Boxler, and L. Zurek. 2013. Insecticide resistance in house flies from the United States: Resistance levels and frequency of pyrethroid resistance alleles. Pest. Biochem. Physiol. 107: 377-384.

Vallejo, C. R., J. A. Lee, J. E. Keesling, C. J. Geden, V.-U. Lietze, and Drion G. Boucias. 2013. A mathematic model that describes modes of MdSGHV transmission within house fly populations. Insects 4: 683-693.

Geden, C. J., D. Johnson, P. E. Kaufman and C. K. Boohene. 2014. Competition between the filth fly parasitoids Muscidifurax raptor and M. raptorellus (Hymenoptera: Pteromalidae). J. Vector Ecol. 39: 278--287.

Geden, C. J. and H. Skovgaard. 2014. Status of Tachinaephagus zealandicus (Hymenoptera: Encyrtidae), a larval parasitoid of muscoid flies, in the eastern U.S. and Denmark. J. Vector Ecol. 39: 453-456.

Machtinger, E. T., C. J. Geden, J. A. Hogsette, and N. C. Leppla. 2014. Development and oviposition preference of house flies and stable flies in six substrates from Florida equine facilities. J. Med. Entomol. 51: 1144-1150

Boucias, D., J. Baniszewski, P. Prompiboon, V. Lietze, and C. J. Geden. 2015. Enhancement of the Musca domestica hytrosavirus infection with peritrophic matrix disruptive chemistries. J. Invertebrate Pathol. 125: 35-43.

Machtinger, E. T., C. J. Geden, and N. C. Leppla. 2015. The effect of linear distance on the parasitism of house fly hosts (Diptera: Muscidae) by Spalangia cameroni (Hymenoptera: Pteromalidae). PLoS ONE 10(6): e0129105. doi: 10.1371/journal.pone.0129105.

Machtinger, E.T., C. J. Geden, P. E. Kaufman, and A. M. House. 2015. Use of pupal parasitoids as biological control agents of filth flies on equine facilities. J. Integr. Pest. Manag. DOI: (Online Publication) First published online: 23 September 2015

Machtinger, E. T. and C. J. Geden. 2015. Comparison of the olfactory preferences of four species of filth fly pupal parasitoids (Hymenoptera: Pteromalidae) in equine and bovine manure. Environ. Entomol 44: 1417-1424

Machtinger, E. T., C. J. Geden, E. D. LoVullo, and P. D. Shirk. 2016. Impacts of extended laboratory rearing on female fitness in the parasitoid Spalangia cameroni (Hymenoptera: Pteromalidae) with an analysis of Wolbachia strains. Annals, Entomol. Soc. Amer. 109(2): 176-182 DOI: (Online Publication)

Machtinger, E. T., E. M. Weeks, and C. J. Geden. 2016. Oviposition deterrence and immature survival of filth flies (Diptera:Muscidae) when exposed to commercial fungal products. Journal of Insect Science (2016) 16(1): 54:1-6. (doi: 10.1093/jisesa/iew032).

Taylor, C. E., E. T. Machtinger, and C. J. Geden. 2016. Manure preferences and postemergence learning of two filth fly parasitoids, Spalangia cameroni and Muscidifurax raptor (Hymenoptera: Pteromalidae). PLoS ONE 11(12): e0167893. (doi:10.1371/journal.pone.0167893).

Machtinger, E.T., E. N. I. Weeks, C. J. Geden, and P. E. Kaufman. 2016. House fly (Musca domestica) (Diptera: Muscidae) mortality after exposure to commercial fungal formulations in a sugar bait. Biocontrol Science and Technology 26 (10): 1444-1450. (Online Publication).

Weeks, E. N. I., E.T. Machtinger, S. A. Gezan, P. E. Kaufman, and C. J. Geden. 2016. Effect of four commercial fungal formulations on mortality and sporulation of house flies (Musca domestica) and stable flies (Stomoxys calcitrans). Medical and Veterinary Entomology 31:15-22 (doi: 10.1111/mve.12201)

Holderman, C. J., L. A. Wood, C. J. Geden, and P. E. Kaufman. 2017. Discovery, development, and evaluation of a horn fly-isolated (Diptera: Muscidae) Beauveria bassiana (Hypocreales: Cordyciptaceae) strain from Florida, USA. J Insect Sci (2017) 17 (2): 51:1-6 (doi: 10.1093/jisesa/iex019)

Johnson, D.M., E. K. Rizzo, C. T. Taylor, and C. J. Geden. 2017. Effect of host decoys on the ability of the parasitoids Muscidifurax raptor and Spalangia cameroni to parasitize house fly (Diptera: Muscidae) puparia. Florida Entomol. 100:444-448.

Biale, H., C.J. Geden, and E. Chiel. 2017. Effects of pyriproxifen on wild populations of the house fly, Musca domestica, and compatibility with its principal parasitoids. Pest Management Science (Online Publication)

Sanscrainte, N.D., H. Arimoto, C M. Waits, L. Y. Li, D. Johnson, C. Geden, J. J. Becnel, and A. S. Estep. 2018. Reduction in Musca domestica fecundity by dsRNA-mediated gene knockdown. PLoS ONE 13(1): e0187353. (Online Publication)

Burgess, E. R., D. M. Johnson, and C. J. Geden. 2018. House fly, Musca domestica L. (Diptera: Muscidae), mortality after exposure to combinations of Beauveria bassiana with the artificial sweeteners erythritol and xylitol. J. Med. Entomol. J. Med. Entomol. 55: 1237-1244

Machtinger E.T., and C. J. Geden. 2018. Biological control of livestock pests: parasitoids. In Garros C, Bouyer J, Takken W, Smallegange RC [eds.], Ecology and Control of Vector-borne Diseases, Volume 5. Prevention and Control of Pests and Vector-borne Diseases in the Livestock Industry. Wageningen Academic Publishers, Wageningen, the Netherlands. (Online Publication)

Weeks, E.N.I., E.T. Machtinger, C.J. Geden, and D. Leemon. 2018. Biological control of livestock pests: entomopathogens. In Garros C, Bouyer J, Takken W, Smallegange RC [eds.], Ecology and Control of Vector-borne Diseases, Volume 5. Prevention and Control of Pests and Vector-borne Diseases in the Livestock Industry. Wageningen Academic Publishers, Wageningen, the Netherlands. (Online Publication)

Sanscrainte, N. D., Waits, C. M., Geden, C. J., Estep, A. S., Becnel, J. J. 2018. Reproducible dsRNA microinjection and oviposition bioassay in mosquitoes and house flies. J. Vis. Exp. (141), e58650, https://doi.org/10.3791/58650 (2018).

Khater, H. F. and C. J. Geden. 2018. Potential of essential oils to prevent fly strike by Lucilia sericata, and effects of oils on longevity of adult flies. J. Vector Ecol. 43: 261-270. (Online Publication)

Johnson, D. M., Weeks, E. N. I., LoVullo, E. D., Shirk, P. D., and Geden C. J. 2018. Mortality effects of three bacterial pathogens and Beauveria bassiana when topically applied or injected into house flies, Musca domestica (Diptera: Muscidae). J. Med. Entomol. 56:774-783. (Online Publication)

Biale, H., E. Chiel, and C.J. Geden. 2019. Autodissemination of pyriproxifen as a method for controlling the house fly Musca domestica. J. Pest Science. (Online Publication)

Burgess, E. T. and C. J. Geden. 2019. Larvicidal potential of the polyol sweeteners erythritol and xylitol in two filth fly species. J. Vector Ecol. 44 (1): 11-17.

Biale, H., C. J. Geden, and E. Chiel. 2019. Heat adaptation of the house fly Musca domestica and its associated parasitoids in Israel. J. Med. Entomol. 57: 113-121. (Online Publication)

Geden, C. J., H. Biale, E. Chiel, and D. M. Johnson. 2019. Effect of fluctuating high temperatures on house flies (Musca domestica L. [Diptera: Muscidae]) and their principal parasitoids (Muscidifurax spp. and Spalangia spp. [Hymenoptera: Pteromalidae]) from the United States. J. Med. Entomol. 56: 1650-1660. (Online Publication)

Khater, H. and C. J. Geden. 2019. Toxicity and repellency potential of vetiver, cinnamon, and lavender essential oils and their blends against larval and adult house flies, Musca domestica L. (Diptera: Muscidae). J. Vector Ecol. 44:256-263.(Online Publication)

Burgess, E. R., C. J. Geden, K. H. Lohmeyer, B. H. King, E. T. Machtinger, E. R. Gaillard, and J. G. Scott. 2020. Toxicity of fluralaner, a companion animal insecticide, relative to industry-leading agricultural insecticides against resistant and susceptible strains of filth flies. Scientific Reports, 10(1), 1-8. (Online Publication)

Stoffolano, J., R. Wong, T. Lo, B. Ford, and C. J. Geden. 2020. Effect of chitosan on adult longevity when fed to Musca domestica L., Tabanus nigrovittaus Macquart, and Phormia regina (Meigen) adults and its consumption in adult Musca domestica L. Pest Manag. Sci. (Online Publication)

Burgess, E. R., B. H. King, and C. J. Geden. 2020. Oral and topical insecticide response bioassays and associated statistical analyses used commonly in veterinary and medical entomology. Journal of Insect Science 20, no. 6 (2020): 6.(Online Publication)

Johnson, D. M., R. L. White, R. L. Pereira, and C. J. Geden. 2020. Beauveria bassiana culturing and harvesting for bioassays with house flies, Musca domestica L. (Diptera: Muscidae). Journal of Insect Science. 2020 Nov;20(6):14.

Geden, C. J., D. M. Johnson, and D. B. Taylor. 2020. Improved sentinel method for surveillance and collection of filth fly parasitoids. J. Insect Sci. 20(6), p.3. (Online Publication)

White, R. L., C. J. Geden, and P. E. Kaufman. 2021. Exposure timing and method affects Beauveria bassiana efficacy against house fly (Diptera: Muscidae) larvae. J. Med. Entomol. (Online Publication)

Rachimi, S., J. P. Burand, C. J. Geden, and J. G. Stoffolano, Jr. 2021. The effect of the Musca domestica Salivary Gland Hypertrophy Virus (MdSGHV) on food consumption in its adult host, the common housefly (Diptera: Muscidae). Journal of Medical Entomology 58: 1398-1404.(Online Publication)

Maiquez, V. F., J. B. Pitzer, and C. J. Geden. 2021. Insecticide resistance development in the filth fly pupal parasitoid, Spalangia cameroni(Hymenoptera: Pteromalidae), using laboratory selections. J. Econ. Entomol. 114: 326-331.(Online Publication)

Geden, C. J., D. Nayduch, J. G. Scott, E. R. Burgess IV, A. C. Gerry, P. E. Kaufman, J. Thomson, V. Pickens, and E. T. Machtinger. 2021. House fly (Musca domestica [Diptera: Muscidae]) – Biology, pest status, current management prospects, and research needs. Journal of Integrated Pest Management, 12(1), p.39.(Online Publication)

White, R. L., C. J. Geden, P. E. Kaufman, and D. M. Johnson. 2021 Comparative virulence of Metarhizium anisopliae and four strains of Beauveria bassiana against house fly (Diptera: Muscidae) adults with attempted selection for faster mortality. J. Med. Entomol. 58: 1771-1778.(Online Publication)

Burgess, E. R., IV, E. E. Taylor, A. Acevedo, M. Tworek, D. Nayduch, N. Khurana, J. S. Miller, and C. J. Geden. 2021. Diets of erythritol, xylitol and sucrose affect the digestive activity and gut bacterial community in adult house flies. Entomologia Experimentalis et Applicata, 169: 878-887.(Online Publication)

Xiong, X., Y. D. Kelkar, C. J. Geden, C. Zhang, Y. Wang, E. Jongepier, E. Verhulst, J. Gadau, J. H. Werren, and X. Wang. 2021. Long-read assembly and annotation of the parasitoid wasp Muscidifurax raptorellus, a biological control agent for filth flies. Frontiers in Genetics. 2021 Nov 12: 2046.(Online Publication)

Machtinger. E.T, E.N.I Weeks, C.J. Geden, and E. Lacher. 2022. Pests and Parasites of Horses. Wageningen Academic Press, 396 pp.(Online Publication)

Pagac, A. A, C. J. Geden, E. T. Machtinger, E.R. Burgess IV, G. P. Martin, and M. R. Riggs. 2022. Survey of filth fly parasitoids (Hymenoptera: Pteromalidae) in poultry layer facilities and the evaluation of monitoring techniques. J. Med. Entomol. (in press).

Morales-Ramos, J. A., J. A. Goolsby, C. J. Geden, M. G. Rojas, M. D. Garcia-Cancino, B. Rodriguez-Veles, H. Arredondo-Bernal, M. A. Ciomperlik, G. S. Simmons, J. R. Gould, and K. A. Hoelmer. 2022. Production of hymenopterous parasitoids. In: Morales-Ramos, M. G. Rojas, and D. Shapiro-Ilan (eds), Mass Production of Beneficial Organisms: Invertebrates and Entomopathogens, Elsevier Press (in press).