Entomology: Personnel
Entomology Faculty
David G. Riley Professor of Entomology Contact InformationAddress: Department of Entomology Phone: 229-386-3374 |
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Research and Outreach
Current research emphasis of the Vegetable Entomology Research Lab at Tifton is on vegetable crop insect pests. The specific kinds of investigation include plant-insect interaction, sampling, population dynamics, economic thresholds, host plant resistance, cultural controls, insecticide efficacy/resistance, and epidemiology associated with insect vectors of plant virus. Recent research projects have focused on the management of thrips, Frankliniella occidentalis and Frankliniella fusca, as vectors of tomato spotted wilt virus (TSWV) in solanaceous crops, tomato and pepper, (http://www.gaipm.org/vegetable/thripstswv.html). The epidemiology of thrips vectored TSWV is being investigated relative to environmental and various management factors summarized in CAES Research Report 704, "Tospoviruses in Solanaceae and Other Crops in the Coastal Plain of Georgia" (http://www.caes.uga.edu/topics/diseases/tswv/vegcrops/tospoviruses/index.html)
Other vegetable insects that are researched in the Vegetable Entomology Lab include other thrips species, whiteflies, pepper weevil, diamondback moth, cabbage looper, imported cabbageworm, squash bug, horned squash bug, melon aphid, corn earworm, fall armyworm, pickleworm, leaffooted bugs, cucumber beetles and others. Current IPM information on vegetable pests and individual pest fact sheets are being summarized on a new vegetable insect management web page that is under construction (http://www.caes.uga.edu/departments/ent/personnel/faculty/riley/
vegcrops/insectsvegcrop.html).
My lab attempts to address the most critical vegetable insect research problems in the State of Georgia's more than 33 vegetable crops. These crops have a farm gate value of approximately one billion dollars and are critical to the State's economy each year. A recent problem of particular importance being addressed in the Vegetable Entomology Lab is insecticide resistance in the diamondback moth, Plutella xylostella. This insect is causing severe problems for cabbage and collard greens growers in Georgia. It also has chemical companies and regulatory agencies worried about continued selection for resistance against current and new insecticides http://www.caes.uga.edu/publications/pubDetail.cfm?pk_id=7458).
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Vegetable Entomology Lab 2005 at the Tifton Campus |
Teaching
Currently (2006), two graduate students in the Vegetable Entomology Lab are investigating thrips relative to TSWV host vegetable crops, including tomato and pepper. One PhD student, Anitha Chitturi, is working collaboratively with the Agricultural University in Hyderabad, India, through an IPM CRSP grant to survey thrips vectors species in India. A second MS Student, Gina Angelella, will be investigating the effect of pollen on thrips behavior here in Georgia. Another MS student, James "Shine" Taylor, just completed work (Summer 2006) on an economic injury level for the beet armyworm, Spodoptera exigua, in tomato and is continuing on for his PhD at the University of Florida. Two recent PhD graduates, P. Houston Joost (currently a Regional Product Management for FMC) and Chatchawan Chaisuekul (currently teaching at Chulalongkorn University, Bangkok, Thailand) conducted research on thrips feeding behavior and reproduction, respectively.
A new course that was developed recently taught at the Tifton Campus was ENTO 4350 Crop-Specific Insect Management (http://www.ent.uga.edu/syllabi/ento4350.pdf). Other courses that have been or will be taught at the Tifton Campus are ENTO 3900 Special Problems in Entomology and ENTO 4000/6000 General Entomology.
Selected Refereed Journal Articles
Riley, D. G., S. V. Joseph, R. Srinivasan, and S. Diffie. 2011. Thrips vectors of tospoviruses. J. Integ. Pest Mngmt. 1(2): 2011, DOI: 10.1603/IPM10020.
Ni, X., A. N. Sparks, Jr., D. G. Riley, and X. Li. 2011. Impact of edible oils on ear pests of sweet corn. J. Econ. Entomol. 104: 956-964 (doi: 10.1603/EC10356).
R. Srinivasan, and F. Guo, D. Riley, S. Diffie, R. Gitaitis, A. Sparks, and A. Jeyaprakash. 2011. Assessment of variation among Thrips tabaci populations from Georgia and Peru based on polymorphism in mitochondrial cytochrome oxidase I and ribosomal ITS2 sequences. J. Entomol. Sci. (in press).
S. Sundaraj, R. Srinivasan, C. Webster, S. Adkins, K. Perry, and D. Riley. 2011. First report of Tomato chlorosis virus in Georgia. Plant Dis. 95:881.
R. Srinivasan, S. Diffie, S. Sundaraj, S. Mullis, D. Riley, R. Gitaitis, and H. Pappu. 2011. Evaluation of lisianthus (Eustoma grandiflorum) as an Indicator host for Iris yellow spot virus. Plant Dis. (in press).
Riley, D. G., S. V. Joseph, W. T. Kelley, S. Olson, and J. Scott. 2011. Host plant resistance to Tomato spotted wilt virus (Bunyaviridae: Tospovirus) in tomato. HortScience. (in press).
Sparks, A.N., S. Diffie, D.G. Riley. 2010. Thrips species composition on onions in the Vidalia production region of Georgia. J. Entomol. Sci. 46:1-6.
Riley, D. G., G. M. Angelella, and R. M. McPherson. 2010. Pine pollen dehiscence relative to thrips (Thysanoptera: Thripidae) population dynamics. Entomologia Experimentalis et Applicata DOI:10.111/j1570-7458.2011.010995.
M.C. Erickson, J. Liao, A. Payton, D. Riley, C. Webb, L. Davey, S. Kimbrel, L. Ma, G. Zhang, M.P. Doyle, and L.R. Beuchat. 2010. Pre-harvest Internalization of E. coli O157:H7 into lettuce leaves as impacted by the presence of insects. J. Food Protection 73(10):1809–1816.
Angelella, G. and D. G. Riley. 2010. Life table bioassay for pine pollen effects on Frankliniella fusca reproduction on onion. Environ. Entomol. 39(2): 505-512.
Joost, H. and D. G. Riley. 2008. Tomato plant and leaf age effects on the probing and settling behavior of Frankliniella fusca and Frankliniella occidentalis (Thysanoptera:Thripidae). Environ. Entomol. 37:213-223.
Taylor, J. E. and D. G. Riley. 2007. Artificial infestations of beet armyworm, Spodoptera exigua, in tomato to estimate an economic injury level. Crop Protection Crop Protection, 27 (2), p.268-274.
Joost, H. and D. G. Riley. 2007. Tomato plant and leaf age effects on the probing and settling behavior of Frankliniella fusca and Frankliniella occidentalis (Thysanoptera:Thripidae). Environ. Entomol. 37:213-223.
Riley, D. G., A. Chitturi, and A. N. Sparks, Jr. 2007. Does natural deposition of pine pollen affect the ovipositional behavior of Frankliniella occidentalis and Frankliniella fusca (Thysanoptera: Thripidae)? Entomol. Exp. et Appl. 124: 133–141.
Taylor, J. E. and D. G. Riley. 2007. The use of metaflumizone against beet armyworm, Spodoptera exigua, to estimate an action threshold in tomato. J. Entomol. Sci. 42: 430-434.
Riley, D. G. 2007. Distribution of grasshoppers and katydids (Orthoptera: Acrididae and Tettigoniidae in leafy greens prior to mechanical harvest. J. Entomol. Sci. 42(2): 261-271.
Riley, D. G. 2007. Effect of imidacloprid on the settling behavior of Frankliniella occidentalis and Frankliniella fusca (Thysanoptera: Thripidae) on tomato and peanut. J. Entomol. Sci. 42:74-83.
Chitturi, A., D. G. Riley, and P. H. Joost. 2006. Effect of pine pollen on settling behavior of Frankliniella occidentalis and Frankliniella fusca (Thysanoptera: Thripidae) in tomato in peanut. Environ. Entomol. 35:1396-1403.
Kuhar, T. P., W. D. Hutchinson, J. Whalen, D. G. Riley, J. C. Meneley, H. B. Doughty, E. C. Burkness, and S. J. Wold-Burkness. 2006. Field evaluation of a novel lure for trapping seedcorn maggot adults. Plant Health Progress doi:10.1094/PHP-2006-0606-01-BR.
McPherson, R. M. and D. G. Riley. 2006. Monitoring thrips (Thysanoptera: Thripidae) presence in flue-curred tobacco using yellow sticky traps. J. Entomol. Sci. 41:170-178.
Chaisuekul, C. and D. G. Riley. 2005. Host Plant, Temperature, and Photoperiod Effects on Ovipositional Preference of Frankliniella occidentalis and F. fusca (Thysanoptera: Thripidae). J. Econ. Entomol. 98: 2107-2113.
Joost, H. and D. G. Riley. 2005. Imidacloprid differentially effects probing and settling behavior of Frankliniella fusca (Hinds) and Frankliniella occidentalis (Pergrande) (Thysanoptera: Thripidae). J. Econ. Entomol. 98: 1622-1629.
Mullis, S. W., D. B. Langston Jr., R. D. Gitaitis, J. L. Sherwood, and A. C. Csinos, D. G. Riley, A. N. Sparks, R. L. Torrance, and M. J. Cook IV. 2004. First Report of Vidalia onion (Allium cepa L.) in Georgia Naturally Infected with Tomato spotted wilt virus and Iris yellow spot virus (family Bunyaviridae, genus Tospovirus). Plant Dis. 88:1285.
Riley, D. and Weijia Tan. 2004. Reproductive vigor in Bemisia agentifolii (Homoptera: Aleyrodidae) associated with bifenthrin resistance. J. Entomol. Sci. 39:567-578.
Riley, D. and H. Pappu. 2004. Tactics for Management of Thrips (Thysanoptera: Thripidae) and Tomato Spotted Wilt Tospovirus in Tomato. J. Econ. Entomol 97:1648-1658.
Joost, P.H. and D. G. Riley. 2004. Sampling techniques for thrips (Thysanoptera: Thripidae) in pre-flowering tomato. J. Econ. Entomol. 97: 1450-1454.
Riley, D. G., and W. Tan. 2003. Host plant effects on resistance to bifenthrin in silverleaf whitefly (Homoptera: Aleyrodidae). J. Econ. Entomol. 96: 1315-1321.
Riley, D. G., and W. Tan. 2002. Increased vigor in whitefly (Homoptera: Aleyrodidae) associated with bifenthrin-resistant males. J. Entomol. Sci. 37: 77-82.
Chaisuekul, C. and D. G. Riley. 2001. Thrips (Thysanoptera: Thripidae) feeding response to concentrations of imidacloprid in tomato leaf tissue. J. Entomol. Sci. 36: 315-317.
Nava-Camberos, U., D. G. Riley, and M. K. Harris. 2001. Temperature and host plant effects on development, survival, and fecundity of Bemisia argentifolii (Homoptera: Aleyrodidae). Environ. Entomol. 30: 55-63.
Nava-Camberos, U., D. G. Riley, and M. K. Harris. 2001. Density-yield relationships and economic injury levels of Bemisia argentifolii (Homoptera: Aleyrodidae) in Cantaloupe. J. Econ. Entomol. 94: 180-189.
Riley, D., D. Batal, and D. Wolff. 2001. Resistance in Glabrous-type Cucumis melo L. to Whiteflies (Homoptera: Aleyrodidae). J. Entomol. Sci. 36:46-56.
Riley, D. G., W. Tan, and D. A. Wolfenbarger. 2000. Activity of enzymes associated with inheritance of bifenthrin resistance in the silverleaf whitefly, Bemisia argentifolii. Southwestern Entomol. 25: 201-211.
Riley, D. G. and H Pappu. 2000. Evaluation of tactics for management of thrips - vectored tomato spotted wilt Tospovirus in tomato. Plant Dis. 84:847-852.
Riley, D. G., W. Tan, and D. A. Wolfenbarger. 1999. Characterization of esterase isozymes from bifenthrin susceptible, resistant and crossed strains of the silverleaf whitefly (Homoptera: Aleyrodidae). J. Entomol. Science. 34: 295-304.
Naranjo, S. E., C. C. Chu, P. C. Ellsworth, T. J. Henneberry, R. L. Nichols, D. G. Riley, and T. F. Watson. 1998. Action thresholds for the management of Bemisia tabaci (Homoptera: Aleyrodidae) in cotton. J. Econ. Entomol. 91:1415-1426.
Loera-Gallardo, J., D. A. Wolfenbarger, and D. G. Riley. 1998. Insecticidal mixture interactions against B-strain sweetpotato whitefly (Homoptera: Aleyrodidae). J. Entomol. Science 33(4): 407-411.
Wolfenbarger, D. A., D. G. Riley, G.L. Leibee, E.V. Gage, C.A. Staetz, G.A. Herzog. 1998. Response of b-strain sweetpotato whitefly to bifenthrin and endosulfan by vial bioassay in the southern United States. J. Entomol. Science 33(4):412-420.
Riley, D. G., and M. A. Ciomperlik. 1997. Whitefly (Homoptera: Aleyrodidae) and associated arasitoid (Hymenoptera: Aphelinidae) population dynamics in the lower Rio Grande Valley of Texas. Environ. Entomol. 26: 1049-1055.
Tan, W., D. G. Riley, and D. A. Wolfenbarger. 1996. Quantification and genetic analysis of bifenthrin resistance in silverleaf whitefly Bemisia argentifolii. Southwest. Entomologist 21:265-27.
Riley, D. G. 1995. Melon cultivar response to Bemisia. Subtropical Plant Science. 47:39-45.
Riley, D. G. and J. C. Palumbo. 1995. Action thresholds for Bemisia argentifolii (Homoptera: Alerodidae) in cantaloupe. J. Econ. Entomol. 88:1733-1738.
Riley, D. G. and J. C. Palumbo. 1995. Interaction of silverleaf whitefly (Homoptera: Alerodidae) with cantaloupe yield. J. Econ. Entomol. 88:1726-1732.
Ahmed, K., F. Khalique, B. A. Malik and D. Riley. 1994. Use of microbial insecticides in Pakistan: special reference to control of chickpea pod borer, Helicoverpa armigera (Hubner). Subtropical Plant Science 46:38-44.
Riley, D. G. 1994. Insecticide control of sweetpotato whitefly in south Texas. Subtropical Plant Science. 46: 45-49.
Riley, D. G. and E. King. 1994. Biology and management of the pepper weevil: a review. Trends in Agricultural Science. 1994(2): 109-121.
Riley, D. G. 1993. A new occurrence of broad mites in peppers in the Lower Rio Grande Valley of Texas. Subtropical Plant Science 45: 46-48.
Eller, F. J., R. J. Bartelt, B. S. Shasha, D. J. Schuster D. G. Riley, P. A. Stansly, T. F. Mueller, K. Schuler, B. Johnson, J. H. Davis and C. A. Sutherland. 1993. Aggregation pheromone for the pepper weevil, Anthonomus eugenii Cano (Coleoptera: Curculionidae): identification and field activity. J. Chem. Ecol. 20(7): 1537-1555.
Riley, D. G. and D. J. Schuster. 1993. Pepper weevil (Coleoptera: Curculionidae) adult response to colored sticky traps in pepper fields. Southwestern Entomologist. 19(2): 93-107.
Berdegue, M., M. Harris, D. Riley, B. Villalon. 1993. Host plant resistance on pepper to pepper weevil (Anthonomus eugenii Cano). Southwestern Entomologist. 19 (3): 265-271.
Riley, D. G. and D. J. Schuster. 1992. The occurrence of Catolaccus hunteri, a parasitoid of Anthonomus eugenii, in insecticide treated pepper. Southwestern Entomologist 17(1): 71-72.
Riley, D. G., D. J. Schuster, and C. S. Barfield. 1992. A refined action threshold for pepper weevil adults, Anthonomus eugenii Cano (Coleoptera: Curculionidae), in bell peppers. J. Econ. Entomol. 85: 1919-1925.
Riley, D. G., D. J. Schuster and C. S. Barfield. 1992. Sampling and dispersion of pepper weevil adults, Anthonomus eugenii Cano (Coleoptera: Curculionidae). Environ. Entomol. 21: 1013-1021.
Riley, D. G., G. J. House and J. Van Duyn. 1987. Effect of phorate on soil arthropods and soybean productivity in a North Carolina coastal plain cropping system. J. Entomol. Sci. 22(4): 317-323.