Medical and Veterinary Entomology
Office Location: 431 Plant Biotechnology Building
Office Phone: 865-974-8824
Post-doctoral experience: University of California, Davis. Vector Genetics
Ph.D., University of Arkansas.Major: Veterinary Entomology, Minor: GIS
M.S., University of Kentucky. Major: Public Health Entomology
B.A. Transylvania University (Lexington, Kentucky). Major: Biology, Minor: Communications
Vector management and control
Vector and pathogen surveillance
Biology and life histories of vectors
Population genetics (including genotype - phenotype associations) of vectors
Research Description:
My research program’s mission is to integrate applied and molecular entomology to improve human and animal health and welfare. My long-term goal is to maintain a nationally and develop an internationally recognized research program that conducts vector-based research with the recognition of improving animal and human health and welfare. My research focuses on the following: a) surveying vector populations and assessing pathogen prevalence; b) ascertaining specific biologies and life histories of vectors by population, species, and/or community; c) investigating population specific vector ecology and genetics; and d) developing and evaluating novel methods for vector management and disease suppression. All of these focuses are centered on my mission and the One Health concept of collaborating with multiple disciplines to attain optimal health (and welfare) for the people, animals, and the environment. We integrate applied research with epidemiological, molecular, bioinformatics, and disease modeling tools to develop an overall better understanding of infectious disease(s) related to human and/or animal health. My laboratory integrates entomological procedures with genetic analyses, vector management, ecology and modeling, and epidemiology to allow for vector and pathogen suppression through integration of control elements, such as habitat management, physician education, and appropriate chemical control technology. We identify primary vectors, quantify the associated disease impact, model areas with disease, relate genotypes to phenotypes, and implement management strategies to reduce negative impacts. Currently the lab focuses on the ecology of vector-borne diseases, and the impact of veterinary flies on livestock health and comfort. 
Representative Publications:

Tick Ecology

Mays S*, Houston AE, Trout Fryxell RT. Specifying pathogen associations of Amblyomma maculatum in western Tennessee. Journal of Medical Entomology. 2016; X(X): X. DOI:

Mays S*, Houston AE, Trout Fryxell RT. Comparing conventional and novel methods of tick collection. Medical and Veterinary Entomology.2016; X(X): X. DOI:

Trout Fryxell RT, DeBruyn JM. The microbiome of Ehrlichia-infected and uninfected Lone star ticks (Amblyomma americanum). PloS One. 2016; 11(1): e0146651. DOI:

Trout Fryxell RT, Moore JE, Collins MD, Kwan Y, Jean-Philippe S, Schaeffer SM, Odoi A, Kennedy M, Houston AE. Habitat and vegetation variables are not enough when predicting tick populations in southeastern United States. PLoS One. 2015; 10(12): e0144092. DOI: 10.1371/journal.pone/0144092.

Pompo K*, Mays S*, Wesselman C*, Paulsen D, Trout Fryxell RT. Survey of ticks collected from Tennessee cattle and their pastures for Anaplasma and Ehrlichia species. Journal of Parasitology. 2015; Epub ahead of print. DOI:

Trout Fryxell RT, Steelman CD, Szalanski AL, Billingsly PM, Williamson PC. Rickettsia pathogens within ticks (Acari: Ixodid) collected from Arkansas. Journal of Medical Entomology. 2015; 52(3): 500-508. DOI: 10.1093/jme/tjv027.

Mays SE*, Hendricks BM*, Paulsen DP, Houston AE, Trout Fryxell RT. Prevalence of five tick-borne bacterial genera in adult Ixodes scapularis removed from white-tailed deer in western Tennessee. Parasites and Vectors. 2014; 7:473. DOI: 10.1186/s13071-014-0473-y.

Trout Fryxell RT, Steelman CD, Szalanski AL, Kvammee KL, Billingsly PM, Williamson PC. Survey of Borreliae in ticks, canines, and white-tailed deer from Arkansas, U.S.A. Parasites and Vectors, 2012; 5:139. DOI: 10.1186/1756-3305-5-139.

Illoldi-Gangel P, Rivaldi CL, Sissel B, Trout Fryxell R, Gordillo-Perez G, Rodriguez-Moreno A, Williamson P, Montiel-Parra G, Sanchez-Cordero V, Sarkar S. Species distribution models and ecological suitability analysis for potential tick vectors of Lyme disease in Mexico. Journal of Tropical Medicine, 2012: DOI: 10.1155/2012/959101

Trout RT, Steelman CD. Ticks parasitizing canines and deer in Arkansas. Journal of Entomological Science, 2010; 45(2):140-148.

Trout RT, Steelman CD, Szalanski AL, Williamson PC. Rickettsia in Gulf Coast Ticks, Arkansas, U.S.A.  Emerging Infectious Disease, 2010; 16(5):830-832. DOI: 10.3201/eid1605.091314

Trout RT, Steelman CD, Szalanski AL. Population genetics of Amblyomma americanum (Acari:  Ixodidae) collected from Arkansas.  Journal of Medical Entomology, 2010; 47(2):152-61. DOI: 10.1603/ME09106

Trout RT, Steelman CD, Szalanski AL, Loftin K. Establishment of Amblyomma maculatum (Gulf Coast Tick) in Arkansas, U.S.A.  Florida Entomologist, 2010; 93(1):120-2. DOI: 10.1653/024.093.0117

Trout RT, Steelman CD, Szalanski AL. Population genetics and phylogeography of Ixodes scapularis Say (Acari:  Ixodidae) collected from Arkansas canines and deer. Southwest Entomologist, 2009; 34(3):273-87. DOI: 10.3958/059.034.0308

La Crosse Virus & other mosquito-related work

Urquhart C*, Paulsen D, Moncayo A, Trout Fryxell RT. Evaluating surveillance methods for arboviral encephalitide vectors Aedes and Culex mosquitoes. In Press, Journal of American Mosquito Control Association.

Trout Fryxell RT, Freyman K, Ulloa A, Hendricks B*, Paulsen D, Odoi A, Moncayo A. Cemeteries are effective sites for surveillance of La Crosse virus (LACv) and these environments may play a role in LACv infection. PLoS One. 2015; 10(4): e0122895. DOI: 10.1371/journal.pone.0122895.

Lambert A, Trout Fryxell RT, Lanciotti R, Freyman K, Ulloa A, Paulsen D, Moncayo A. Sequence analysis of a La Crosse virus strain isolated from a fatal pediatric encephalitis case that occurred in TN, USA 2012 and comparison with geographically and temporally relevant La Crosse virus sequences of mosquito origin. Journal of Emerging and Infectious Diseases. 2015; 21(5): 833-836. DOI: 10.3201/eid2105.141992.

Cornel A, Lee Y, Trout Fryxell RT, Seifert S, Nieman C, Lanzaro GC. Culex pipiens sensu lato in California: A complex within a complex? Journal of the American Mosquito Control Association, 2012; 28(4s):113-121.  DOI: 10.2987/8756-971X-28.4s.113

Trout Fryxell RT, Seifert S, Lee Y, Sacko A, Lanzaro G, Cornel AJ. The kdr mutation and knockdown time in Anopheles gambiae (Diptera: Culicidae) collected from Mali evaluated through a bottle bioassay and a novel insecticide treated net (ITN) bioassay. Journal of the American Mosquito Control Association, 2012; 2:119-122. DOI: 10.2987/11-6216R.1

Trout Fryxell RT, Nieman CC, Fofana A,Lee Y, Traoré SF, Cornel AJ, Luckhart S, Lanzaro GC. Differential Plasmodium falciparum infection of Anopheles gambiae s.s. molecular and chromosomal forms in Mali. Malaria Journal, 2012; 11:133. DOI: 10.1186/1475-2875-11-133

Lee Y, Seifert S, Nieman CS, McAbee RD, Goodell P, Trout Fryxell RT, Lanzaro GC, Cornel AJ. High degree of single nucleotide polymorphisms in California Culex pipiens  (Diptera: Culicidae) sensu lato.  Journal of Medical Entomology, 2012; 49(2):299-306. DOI: 10.1603/ME11108 

Trout RT, Brown GC. Impact of residual insecticide applied to upper story vegetation on resting adult mosquitoes. Florida Entomologist, 2009; 92(1):91-8. DOI: 10.1603/0022-2585(2007)44[470:EOTPIA]2.0.CO;2

Trout RT, Brown GC, Potter MF, Hubbard JL. Efficacy of two pyrethroid insecticides applied as barrier treatments for managing mosquito (Diptera: Culicidae) populations in suburban residential properties. Journal of Medical Entomology, 2007; 44(3):470-7. DOI: 10.1603/0022-2585(2007)44[470:EOTPIA]2.0.CO;2

Saenz VL, Townsend LH, Vanderpool RM, Schardein MJ, Trout RT, Brown GC. Ochlerotatus japonicus japonicus in the state of Kentucky. Journal of the American Mosquito Control Association, 2006; 22(4):754-5. DOI: 10.2987/8756-971X(2006)22[754:OJJITS]2.0.CO;2


Animal Health & Welfare

Carlson JS, Walther E, Trout Fryxell RT, Staley S, Tell LA, Sehgal RNM, Barker CM, Cornel AJ. Identifying avian malaria vectors: sampling methods influence outcomes. Parasites and Vectors. 2015; 8:365. DOI: 10.1186/s13071-015-0969-0.

Trout Fryxell RT, Thompson Lewis T*, Peace H*, Hendricks BM*, Paulsen D. Identification of avian malaria (Plasmodium reticulum) and canine heartworm (Dirofilaria immitis) in the mosquitoes of Tennessee. Journal of Parasitology. 2014; 100(4): 455-462. DOI:

Trout RT, Steelman CD, Szalanski AL. Phylogenetics and Population Genetics of the louse fly, Lipoptena mazamae from Arkansas, USA. Medical and Veterinary Entomology, 2010; 24(3): 258-65. DOI: 10.1111/j.1365-2915.2010.00878.x

Steelman CD, Szalanski AL, Trout RT, McKern JA, Solorzano C, Austin JW. Susceptibility of the bed bug Cimex lectularius L. (Heteroptera: Cimicidae) to selected insecticides. Journal of Agriculture and Urban Entomology, 2008; 25(1):41-51. DOI: 10.3954/1523-5475-25.1.41



Pappano D, Trout Fryxell RT, Warren M. Oral mucosal envenomation of an infant by a puss caterpillar. Accepted January 2015 to Pediatric Emergency Care.

Shrestha S, Mudge J, Miller NA, Trout Fryxell RT, Lamour K. SNP markers identify widely distributed clonal lineages of Phytophthora colocasiae in Vietnam, Hawaii, and Hainan Island, China. Mycologia. 2014; 106(4): 676-685. DOI: 10.3852/13-165.

Hu J, Diao Y, Zhou Y, Lin D, Bi Y, Pang Z, Trout Fryxell RT, Liu X, Lamour K. Loss of heterozygosity drives clonal diversity of Phytophthora capsici in China. PLoS One, 2013; 8(12): e82691. DOI: 0.1371/journal.pone.0082691

Trout RT, Minteer CR, Pallipparambil GR, Magnus RM, Wiedenmann RN. A perspective on education in research ethics for entomology graduate students. American Entomologist, 2010; 56(4): 198-205.



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