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David Ragsdale

Ragsdale, David
David Ragsdale
Professor and Department Head
Office:
412 Heep Center
Email:
Phone:
979.845.2510
Undergraduate Education
B.S. Biology, Point Loma College, 1974
Graduate Education
Ph.D. Entomology and Microbiology, Louisiana State University, 1980
M.S. Entomology and Microbiology, Louisiana State University,1977

RESEARCH INTERESTS:

Dr. Ragsdale’s research interests are focused in two broad areas:

  • 1) management of insect vectors of plant pathogens and
  • 2) using arthropod herbivores to control invasive perennial plants.

Dr. Ragsdale leads an intensive multistate effort in the North Central US on the invasive aphid, Aphis glycines, or soybean aphid, whose native range is Asia.  He and his colleagues have studied the overwintering biology of this aphid, evaluated the vector potential of this new exotic aphid, conducted foreign exploration for natural enemies of the soybean aphid in China, Japan and Korea for possible introduction into the U.S., and have developed management strategies to help soybean producers minimize losses caused by this invasive insect.  In 2003, the Minnesota Soybean Research and Promotion Council recognized Dr. Ragsdale for his pioneering work on soybean aphid biology in North America.

Dr. Ragsdale is also a recognized authority in the area of potato pest management.  He has developed non-chemical control strategies that limit the spread of aphid-transmitted plant viruses in seed potato that have been adopted by virtually all seed growing regions in North America.  His work includes molecular characterization of virus strains, identifying resistant genes in wild Solanum germplasm that might impart resistance to aphids and viruses in cultivated potato, and practical application of cultural practices that limit the spread of aphid transmitted viruses.  In 2002, Dr. Ragsdale and his colleague Dr. Radcliffe, were jointly awarded the Meritorious Service Award by the National Potato Council for their work on aphid transmitted viruses in potatoes and a research article published in the American Journal of Potato Research was selected as the Outstanding Paper for 2004.

The use of insect herbivores to control invasive perennial weeds such as purple loosestrife, leafy spurge, garlic mustard and buckthorn represent the active projects he is involved with along with colleagues at CABI, Delemont, Switzerland, Minnesota DNR and MDA and Agronomy and Plant Genetics (Weed Science).  Projects range from discovery of agents overseas to developing methods of dispersing insects approved for release in North America.  Dr. Ragsdale was honored by the Minnesota Vegetation Management Association of Minnesota for his work on biological control of purple loosestrife in Minnesota. (Top)

RECENT PUBLICATIONS:

Journal Articles:

Published or in-press peer reviewed articles:  (Total 90:  73 journal and review articles + 17 contributed book chapters)

R.L. Koch,  P.M. Porter, M.M. Harbur, M.D. Abrahamson, K.A.G. Wyckhuys, D.W. Ragsdale, K. Koch, Z. Sezen & G.E. Heimpel.  2011.  Response of soybean insects to an autumn-seeded rye cover crop.  Environmental Entomology (submitted, July 2011).

Schmidt, N.P., M.E. O’Neal, P.F. Anderson, D. Lagos, D. Voegtlin, W. Bailey, E. Cullen, C.D. DiFonzo, C. Gratton, D. Johnson, C.H. Krupke, B.P. McCornack, R.J. O’Neil, D.W. Ragsdale, K.J. Tilmon, and Jeff Whitworth.  20.  Soybean aphid migrations across the Midwest United States: A summary of the suction trap network.  J. Econ. Entomol.   (accepted)

Ragsdale, D. W., G. E. Heimpel, D.A. Landis, J. Brodeur, N. Desneux.  2011.  Ecology and Management of the soybean aphid in North America.  Annual Review of Entomology.  56: 375–399.

Pang, Y.P., S. Brimijoin, D. W. Ragsdale, K. Y. Zhu, and R. Suranyi.  2011.  Novel and Viable Acetylcholinesterase Target Site for Developing Effective and Environmentally Safe Insecticides, Current Drug Targets.  accepted  for publication in 2011

Polsinelli, G. A., S. K. Singh, R. K. Mishra, R. Suranyi, D. W. Ragsdale, Y. P. Pang, and S.  Brimijoin.  2010.  Insect-Specific Irreversible Inhibitors of Acetylcholinesterase in Pests Including the Bed Bug, the Eastern Yellowjacket, German and American Cockroaches, and the Confused Flour Beetle.  Chem. Biol. Interact. 187 (1-3): 142-147   PMID20109441.

O’Neal, M., K. Johnson, E. Hodgson, D. Ragsdale, I. MacRae, B. Potter, C. DiFonzo, K. Tilmon, E. Cullen, P. Glogoza, and B. P. McCornack.  2010.  Comment on “Soybean Aphid Population Dynamics, Soybean Yield Loss, and Development of Stage-Specific Economic Injury Levels” by M. A. Catangui, E. A. Beckendorf, and W. E. Riedell, Agron. J. 101:1080-1092 (2009).  Agronomy Journal 102: 55-56.

Costamagna, A.C., McCornack, B. P., D. W. Ragsdale, and. D.A. Landis.  2010.  Development and Validation of Node-Based Sample Units for Estimating Soybean Aphid (Hemiptera: Aphididae) Densities in Field Cage Experiments.  J. Econ. Entomol.  103:  1483-1492.

Chiozza, M.V., M.E. O’Neal, G.C. MacIntosh, D.I. Chandrasena, N.A. Tinsley, S.R. Cianzio, A.C. Costamagna, E. Cullen, C.D. DiFonzo, B.D. Potter, D.W. Ragsdale, K. Steffey, K.J. Tilmon, and K.J. Koehler.  2010.  Host plant resistance for soybean aphid management: a multi-environment study.  Crop Sci. (Accepted Dec 09 pending minor revision due Jan 2010)

Koch, K.A., B. D. Potter, and D. W. Ragsdale.  2010.  Non-target Impacts of Soybean Rust Fungicides on the Fungal Entomopathogens of Soybean Aphid.  J. Invert. Pathology 103: 156-164.

Johnson. K.D., M.E. O’Neal, D. W. Ragsdale, C.D. DiFonzo, S.M. Swinton, P.M. Dixon, B.D. Potter, E.W. Hodgson, and A.C. Costamagna.  2009.  Probability of Cost-Effective Management of Soybean Aphid (Hemiptera: Aphididae) in North America.  J. Econ. Entomol.  102: 2101-2108.

Yuan-Ping Pang, Fredrik Ekström, Gregory A. Polsinelli, Yang Gao, Sandeep Rana, Duy H. Hua, Björn Andersson, Per Ola Andersson, Lei Peng, Sanjay K. Singh, Rajesh K. Mishra, Kun Yan Zhu, Ann M. Fallon, David W. Ragsdale, Stephen Brimijoin.  2009.  Selective and Irreversible Inhibitors of Mosquito Acetylcholinesterases for Controlling Malaria and Other Mosquito-Borne Diseases.  PLoS ONE 4 (2), e4349 (2009).

Davis, J.A., E. B. Radcliffe, C. A. Thill, and D. W. Ragsdale.  2009.  Planter skips and impaired stand favors PVY spread in potato.  Amer. J. Potato Res. 86(3): 203-208.

Carroll, M. W., E. B. Radcliffe, I. V. MacRae, D. W. Ragsdale, K. D. Olson, and T., Badibanga.  2009.  Border Treatment to Reduce Insecticide Use in Seed Potato Production: Biological, Economic, and Managerial Analysis.  Amer. J. Potato Res.  86(1): 31-37.

Yoder, M. V., L.C. Skinner, and D.W. Ragsdale.  2008.  Common buckthorn, Rhamnus cathartica L.: Available feeding niches and the importance of controlling this invasive woody perennial in North America.  Proc. International Biological Control of Weeds Symposium. pp. 232-237.

Katovich E.J.S., R.L. Becker, D.W. Ragsdale, and L.C. Skinner.  2008.  Growth and Phenology of Three Lythraceae Species in Relation to Feeding by Galerucella calmariensis and Galerucella pusilla: Predicting Ecological Host Range from Laboratory Host Range Testing.  Inv. Plant Sci Management.  1(2): 207-215.

McCornack, B. P., A. D. Costamagna, and D. W. Ragsdale.  2008.  Within-Plant Distribution of Soybean Aphid (Hemiptera: Aphididae) and Development of Node-Based Sample Units for Estimating Whole-Plant Densities in Soybean.  J. Econ. Entomol.  101(4): 1488-1500.

Davis, J.A., E. B. Radcliffe, and D. W. Ragsdale.  2007.  Identifying and mapping resistance to green peach aphid, Myzus persicae (Sulzer), in potato.  Am. J. Potato Res.  84: 86-87.

McCornack, B. P., R. L. Koch, and D. W. Ragsdale.  2007.  A simple method for in-field sex determination of the multicolored Asian lady beetle (Coleoptera: Coccinellidae).  J. Insect Science.  7:  10  http://www.insectscience.org/7.10/i1536-2442-2007-10.pdf

Ragsdale, D. W., B. P. McCornack, R. C. Venette, B. D. Potter, I. V. MacRae, E. W. Hodgson, M. E. O’Neal, K. D. Johnson, R. J. O’Neil, C. D. Difonzo, T. E. Hunt, P. Glogoza, and E. M. Cullen.  2007.  Economic threshold for soybean aphid (Homoptera:  Aphididae).  J. Econ. Entomol.  100(4): 1258-1267.

Davis, Jeffrey A., Edward B. Radcliffe and David W. Ragsdale.  2007.  Resistance to green peach aphid, Myzus persicae (Sulzer), and potato aphid, Macrosiphum euphorbiae (Thomas), in potato cultivars.  Amer. J. Pot. Res.  84:  259-269.

Hodgson, E. W., B. P. McCornack, K. A. Koch, D. W. Ragsdale, K. D. Johnson, M. E. O’Neal, E. M. Cullen, H. J. Kraiss, C. D. DiFonzo, M. Jewett, and L. M. Behnken.  2007.  Field validation of Speed Scouting for soybean aphid.  Online Journal.  Crop Manag.  http://www.plantmanagementnetwork.org/cm/

Song, Feng, Scott M. Swinton, Christine DiFonzo, Matthew O’Neal and David W. Ragsdale.  2006.  Profitability analysis of soybean aphid control treatments in three northcentral states.  Staff Paper 2006-24 June 2006.  peer reviewed staff paper http://agecon.lib.umn.edu/cgi-bin/pdf_view.pl?paperid=23574&ftype=.pdf

Davis, J. A., E. B. Radcliffe, and D. W. Ragsdale.  2006.  Modeling effects of high and fluctuating temperatures on green peach aphid, Myzus persicae (Hemiptera: Aphididae).  Environ. Entomol.  35: 1461-1468.

McCornack, B. P. and D. W. Ragsdale.  2006.  Efficacy of thiamethoxam to suppress soybean aphid populations in Minnesota soybean.  Online Journal.  Crop Management.  http://dx.doi.org/10.1094/CM-2006-0915-01-RS

Zhu, M., E.B. Radcliffe, D.W. Ragsdale, I.V. MacRae and M.W. Seeley.  2006.  Low-level jet streams associated with spring aphid migration and current season spread of potato viruses in the U.S. northern Great Plains.  Agricultural Forest Meteorol.  138: 192-202. http://dx.doi.org/10.1016/j.agrformet.2006.05.001

Skinner, L.C., D.W. Ragsdale, R.W. Hansen, M.A. Chandler, and G. Spoden.  2006.  Phenology of first and peak emergence of Aphthona lacertosa and A. nigriscutis introduced for biological control of leafy spurge, Euphorbia esula L.  Biological Control.  37: 382-391.  http://dx.doi.org/10.1016/j.biocontrol.2006.01.008

Carrillo, M.A., R.L. Koch, E.C. Burkness, K., Bennett, D.W. Ragsdale, and W.D. Hutchison.  2005.  Overwintering of bean leaf beetle (Coleoptera: Chrysomelidae) in Minnesota: a revision of a predictive model for survival at low temperatures.  Environ. Entomol.  34(6):  1395 – 1401.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s4.pdf

Hodgson, E. W., R. L. Koch, and D. W. Ragsdale.  2005.  Pan trapping for soybean aphid (Homoptera: Aphididae) in Minnesota soybean.  J. Entomol. Sci.  40: 409-419

Hodgson, E. W., R. C. Venette, M. Abrahamson, and D. W. Ragsdale.  2005.  Alate production of soybean aphid (Homoptera: Aphididae) in Minnesota.  Environ. Entomol.  34:  1456-1463.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf

Davis, J. A., E. B. Radcliffe, D. W. Ragsdale.  2005.  Soybean aphid, Aphis glycines Matsumura, a new vector of Potato Virus Y in potato.  Amer. J. Potato Res.  81: 101-105.

McCornack, B. P., M. A. Carrillo, R. C. Venette, and D.W. Ragsdale.  2005.  Physiological constraints to the overwintering distribution of the soybean aphid (Homoptera: Aphididae).  Environ. Entomol.  34: 235-240.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf

Hodgson, E. W., E. C. Burkness, W. D. Hutchison, and D. W. Ragsdale.  2004.  Enumerative and binomial sequential sampling plans for soybean aphid (Homoptera: Aphididae) in soybean.  J. Econ. Entomol. 97(6):  2127-2136.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00220493/v97n6s48.pdf

McCornack, B., D. W. Ragsdale, and R. C. Venette.  2004.  Demography of Soybean Aphid (Homoptera: Aphididae) at Summer Temperatures.  J. Econ. Entomol.  97(3):  854-861.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00220493/v97n3s22.pdf

Skinner, L. C., D. W. Ragsdale, R.W. Hansen, M.A. Chandler and R.D. Moon.  2004.  Temperature-dependent development of overwintering Aphthona lacertosa and A. nigriscutis (Coleoptera:  Chrysomelidae), two flea beetles introduced for the biological control of leafy spurge, Euphorbia esula.  Environ. Entomol.  33: 147-154.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/0046225x/v34n6s12.pdf

Ragsdale, D. W., D. V. Voegtlin and R. J. O’Neil.  2004.  Soybean Aphid Biology in North America.  Annals Entomol. Soc. Amer.  97:  204-208.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s2.pdf

Heimpel G. E., D. W. Ragsdale, R. C. Venette, K. Hopper, R. J. O’Neil, C. Rutledge, and Z. Wu.  2004.  Prospects for importation biological control of the soybean aphid: anticipating potential costs and benefits, Ann. Entomol. Soc. Amer.  97:  249-258.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s9.pdf

Wu, Z., D. Schenk-Hamlin, W. Zhan, D. W. Ragsdale and G. E. Heimpel.  2004.  The soybean aphid in China – an historical review.  Ann. Entomol. Soc. Amer.  97:  209-218.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s3.pdf

Venette, R. C and D. W. Ragsdale.  2004.  Assessing the invasion by soybean aphid (Homoptera: Aphididae): where will it end?  Ann. Entomol. Soc. Amer. 97:  219-226.  http://docserver.esa.catchword.org/deliver/cw/pdf/esa/freepdfs/00138746/v97n2s4.pdf

Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, B., L. Skinner, T. R. Collier, and J. E. Lloyd.  2003Roles of bootstrap resampling, measure of central tendency, and method for calculating thermal units when developing phenology models for pest management.  International J. of Pest Management.  49:  319 – 325.

Novy, R.G., A. Nasruddin, D.W. Ragsdale, and E.B. Radcliffe.  2002.  Genetic resistance to potato leafroll virus (PLRV), potato virus Y (PVY) and green peach aphid (Myzus persicae) in progeny of Solanum tuberosum.  Amer J Potato Res 79:9-18.

Ruano-Rossil, J. M., E. B. Radcliffe, D. W. Ragsdale. 2002. In: Dedryver, et. al. (eds), Disruption of entomopathogenic fungi of green peach aphid, Myzus persicae (Sulzer), by fungicides used to control potato late blight, Aphids in a New Millenium, 6th Int. Sympos. Aphids in a New Millennium, INRA, Versailles, pp. 365-370.

Radcliffe, E. B. and D. W. Ragsdale.  2002.  Aphid transmitted potato viruses:  the importance of understanding vector biology.  Amer. J. Pot. Res. 79:353-386.

Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, B. Chen-Charpentier, L. Skinner, and J. E. Lloyd.  2002.  Required number of location-years for estimating functional lower developmental thresholds and required thermal summations of insects: first emergence of Apthona nigriscutis Foudras as an example.  International Journal of Pest Management.  48: 147-154.

Legg, D. E., S. M. Van Vleet, D. W. Ragsdale, R. W. Hansen, and J. E. Lloyd.  2002.  Phenology Models for first emergence of aldult Apthona nigriscutis (Coleoptera: Chrysomelidae), a biological control agent of leafy spurge (Euphorbiaceae).  Environ. Entomol.  31: 348-353.

Novy, R.G., A. Nasruddin, D.W. Ragsdale, and E.B. Radcliffe.  2002.  Genetic resistance to potato leafroll virus (PLRV), potato virus Y (PVY), and green peach aphid (Myzus persicae) in progeny of Solanum etuberosum.  Amer. J. Potato Research, 79:9-18.

Ragsdale, D. W., E. B. Radcliffe, and C. D. DiFonzo.  2001. Epidemiology and Field Control of PVY and PLRV, pp. 237-270. In G. Loebenstein and P. Berger, A. A. Brunt and R. Lawson [eds.] Virus and virus-like diseases of potatoes and production of seed-potatoes, Kluwer Academic Publishers, The Netherlands, 460 pp.

Newman, R. M., D. W. Ragsdale, A. Milles, C. Oien.  2001.  Overwinter habitat and the relationship of overwinter to in-lake densities of the milfoil weevil, Euhrychiopsis lecontei, a Eurasian watermilfoil biological control agent.  J. Aquatic Plant Management, 39: 63-66.

Stamm Katovich, E. J., Ragsdale, D. W., Skinner, L. C., and R. L. Becker.  2001.  Effect of Galerucella spp. feeding on seed production in Lythrum salicaria.  Weed Science 49: 190-104

Mazzei, K. C., R. M. Newman, A. Loos, & D. W. Ragsdale.  1999.  Developmental rates of the milfoil weevil, Euhrychiopsis lecontei, and damage to Eurasian watermilfoil at constant temperatures.  Biocontrol 16: 139-143.

Katovich, E. J., R. L. Becker, and D. W. Ragsdale.  1999.  Impact of defoliation by the leaf beetles, Galerucella calmariensis and G. pusilla, and mechanical shoot clipping on survival of purple loosestrife (Lythrum salicaria) crowns.  Weed Sci. 47:360-365

James, P. J., R. D. Moon, and D. W. Ragsdale.  1998.  Serum and skin surface antibodies and their association with sheep biting lice, Bovicola ovis, on experimentally infested sheep.  Med. Vet. Entomol.  12: 276-283.

DiFonzo, C. D., D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad & G. A. Secor.  1996.  Seasonal abundance of aphid vectors of potato virus Y (PVY) in the Red River Valley of Minnesota and North Dakota.  J. Econ. Entomol. 90:  824-831

DiFonzo, C. D, D. W. Ragsdale, E. B. Radcliffe, N. C. Gudmestad & G. A. Secor .  1996.  Crop borders reduce potato virus Y incidence in seed potato.  Annals Appl. Biol.  129:  289-302

Ragsdale, D. W. & C. T. Oien.  1996.  An environmental risk assessment for release of an exotic microsporidium for European corn borer control in North America.  Systematics Association, Special Volume XX:401-417.

DiFonzo, C. D., D. W. Ragsdale, & E. B. Radcliffe.  1995.  Potato leafroll virus spread in differentially resistant potato cultivars under varying aphid densities.  Am. Pot. J.  72: 119-132.

Hanafi, A., E. B. Radcliffe, & D. W. Ragsdale.  1995.  Spread and control of potato leafroll virus in the Souss-Massa valley of Morocco.  Crop Protect.  14: 145-153.

DiFonzo, C. D., D. W. Ragsdale, & E. B. Radcliffe.  1994.  Susceptibility to potato leafroll virus:  interacting effect of cultivar, plant age at inoculation, and inoculation pressure on tuber infection.  Plant Dis. 78: 1173-1177.

Oien, C. T. & D. W. Ragsdale.  1993.  Susceptibility of nontarget hosts to Nosema furnacalis (Microsporida: Nosematidae), a potential biological control agent of the European corn borer.  Biol. Con. 3: 323-328.

Oien, C. T. & D. W. Ragsdale.  1992.  A species-specific enzyme-linked immunosorbent assay for Nosema furnacalis (Microspora: Nosematidae).  J. Invert. Pathology 60: 84-88.

Flanders, K. L., E. B. Radcliffe, & D. W. Ragsdale.  1991.  Potato leafroll virus spread in relation to densities of green peach aphid (Homoptera: Aphidiae): implications for management thresholds for Minnesota seed potatoes.  J. Econ. Entomol.  84: 1028-1036.

Flanders, K. L., D. W. Ragsdale, & E. B. Radcliffe.  1990.  Use of enzyme-linked immunosorbent assay to detect potato leafroll virus in field grown potato, cv. Russet Burbank.  Amer. Potato J.  67: 589-602.

Ragsdale, D. W. & K. M. Kjer.  1989.  Diagnosis of tracheal mite (Acarapis woodi Rennie) parasitism of honey bees using a monoclonal based enzyme-linked immunosorbent assay.  Am. Bee J.  129: 550-553.

Furgala, B. F, S. Aboulfaraj, D. W. Ragsdale, and D. Hyser.  1989.  Some effects of the honey bee tracheal mite (Acarapis woodi) on the non-migratory wintering honey bee (Apis mellifera) colonies in east central Minnesota.  Am. Bee J.  129: 195-197.

Kjer, K. M., D. W. Ragsdale, and B. Furgala.  1989.  A retrospective and prospective overview of the honey bee tracheal mite, Acarapis woodi R. part 2 of a two-part series.  Am. Bee J. 129: 112-115.

Kjer, K. M., D. W. Ragsdale, and B. Furgala.  1989.  A retrospective and prospective overview of the honey bee tracheal mite, Acarapis woodi R. part 1 of a two-part series.  Am. Bee J. 129: 25-28.

Hanafi, A., E. B. Radcliffe, and D. W. Ragsdale.  1989.  Spread and control of potato leafroll virus in Minnesota.  J. Econ. Entomol. 82: 1201-1206.

Setiawan, D. P. and D. W. Ragsdale.  1987.  Use of aluminum-foil and oat-straw mulches for controlling aster leafhopper, Macrosteles fascifrons (Homoptera: Cicadellidae), and aster yellows in carrot.  Great Lakes Entomol. 20: 103-109.

Ragsdale, D. W. and B. Furgala.  1987.  A seriological approach to the detection of Acarapis woodi parasitism of Apis mellifera.  Apidologie 18: 1-10.

Loughran, J. C, and D. W. Ragsdale.  1986.  Medina n. sp. (Diptera: Tachinidae): A new parasitoid of the bean leaf beetle, Cerotoma trifurcata (Coleoptera: Chrysomelidae).  J. Kansas Entomol. Soc.  59: 468-473.

Loughran, J. C. and D. W. Ragsdale.  1986.  Life cycle of the bean leaf beetle, Cerotoma trifurcata (Coleoptera: Chrysomelidae), in southern Minnesota.  Ann. Entomol. Soc. Am.  79: 34-38.

Ragsdale, D. W., A. D. Larson, and L. D. Newsom.  1981.  Quantitative assessment of the predators of Nezara viridula eggs and nymphs within a soybean agroecosystem using an ELISA.  Environ. Entomol.  10: 402-405.

Hranitzky, K. W., A. D. Larson, D. W. Ragsdale, and R. J. Siebling.  1980.  Isolation of 01 serovars of Vibrio cholerae from water by serologically specific method.  Science 210: 1025-1026.

Ragsdale, D. W., A. D. Larson, and L. D. Newsom.  1979.  Microorganims associated with feeding and from various organs of Nezara viridula.  J. Econ. Entomol.  72: 725-727.

Books and Book Chapters:  (17 Total)

Ragsdale, D. W. and B. Furgala.  1986.  Progress on New Detection Methods for Acarapis woodi.  Proceeding of the Honey Bee Tracheal Mite (Acarapis woodi, R.) Scientific Symposium.  July 8-9 1986.  Saint Paul, MN.

Radcliffe, E. B., K. F. Flanders, D. W. Ragsdale, & D. M. Noetzel.  1991.  Potato Insects —  Pest Management Systems for Potato Insects, pp. 586-621,  In: D. Pimentel [ed.], CRC Handbook of Pest Management in Agriculture, Boca Raton, FL.

Ragsdale, D. W., E. B. Radcliffe, C. D. DiFonzo, & M. S. Connelly.  1992. Action Thresholds for an Aphid Vector of Potato Leafroll Virus.  In G. W. Zehnder, R. K. Jansson, M. L. Powelson, & K. V. Raman [eds.] “Advances in Potato Pest Management”.

Radcliffe, E. B. & D. W. Ragsdale.  1993.  Insect Pests of Potato in Minnesota and North Dakota, pp. 77-84.  In H. L. Bissonnette, D. Preston, & H. A. Lamey [eds.], Potato Production and Pest Management in North Dakota and Minnesota.  Joint NDSU/UM Extension Bulletin 26.

Radcliffe, E. B., D. W. Ragsdale, K. F. Flanders.  1994.  Management of aphids and leafhoppers, pp 117-126.  In R. C. Rowe [ed.]  Potato health management, American Phytopath. Society Plant Health Management Series, APS Press.

Mahr, S. E., J. A. Wyman, E. B. Radcliffe, C. W. Hoy and D. W. Ragsdale.  1995.  Chapter 5, Potato, pp. 63-76 in Vegetable Insect Management with Emphasis on the Midwest, R. E. Foster and B. R. Flood, eds., Meister Publishing Co., Willoughby

Radcliffe, E. B., G. Ouedraogo, S. E. Patten, D. W. Ragsdale, and P. P. Strzok.  1995.  Neem in Niger: A new context for a system of indigenous knowledge, pp.35-70.  In D. M. Warren, L. J. Slikkerveer, and D. Brokensha, [eds.], The Cultural Dimension of Development, Indigenous Knowledge Systems.  Intermediate Technology Publications, London.

Andow, D., D. Ragsdale, & B. Nyvall, eds.  1997.  Ecological Interactions and Biological Control, Westview Press, 334 pp.

Andow, D. A., D. W. Ragsdale, R. F. Nyvall.  1997.  Biological control in cool temperate regions, pp. 1-28.  In D. Andow, D. Ragsdale, & B. Nyvall, [eds.], Ecological Interactions and Biological Control, Westview Press, Boulder.

Ragsdale, D. W., E. B. Radcliffe, and C. D. DiFonzo.  2001. Epidemiology and Field Control of PVY and PLRV, pp. 237-270. In G. Loebenstein and P. Berger, A. A. Brunt and R. Lawson [eds.] Virus and virus-like diseases of potatoes and production of seed-potatoes, Kluwer Academic Publishers, The Netherlands, 460 pp.

Ragsdale, D. W., E.rin W. Hodgson1, Brian P. McCornack1, Karrie A. Koch1, Robert C. Venette2, and Bruce D. Potter3

Ragsdale David W., Edward B. Radcliffe, and Kathy L. Flanders.  2007.  Managing Aphids and Leafhoppers.  In D. Johnson, [ed].Potato Health Management, American Phytopath. Society Plant Health Management Series, APS Press, St. Paul, MN.

Andow, D. W., G.P. Fitt, E.E. Grafius, R.E. Jackson, E.B. Radcliffe, D.W. Ragsdale, L. Rossiter.  2007.  Pesticide and Transgenic Plant Resistance Management in the Field, In R. Hollingworth, D. Mota-Sanchez and M.E. Whalon [eds].  Global Pesticide Resistance in Arthropods, Management, CAB International, Wallingford, UK.

Ragsdale, David W. and Karrie A. Koch.  2008.  Fungicides: Do They Adversely Affect Beneficial Insect Pathogens in Multiple Cropping Systems?  Proceedings of the 2008 Illinois Crop Protection Technology Conference, pp. 57-66.  http://www.ipm.uiuc.edu/education/proceedings/icptcp2008.pdf

Radcliffe, E. B., D. W. Ragsdale, and R. A. Suranyi.  2008.  IPM Case Studies:  Seed Potato.  In: Aphids as crop pests, H.F. van Emden and R. Harrington (eds.).  CAB International, 717 pp.

Radcliffe, E. B., D. W. Ragsdale, R. A. Suranyi, C. D. DiFonzo, and E. E. Hladilek.  2008.  Aphid Alert:  how it came to be, what it achieved, and why it proved unsustainable.  In Areawide IPM:  Theory to Implementation, Koul, O., G. W. Cuperus, and N.C. Elliott [eds.].  CAB International.  Chapter 13, pp. 244-260.

Davis, J. A., E. B. Radcliffe, W. Schrage and D. W. Ragsdale.  2008.  Seed potato production IPM, In: E.B. Radcliffe, W. D. Hutchison, and R. E. Cancelado (eds.), Insect Pest Management, Cambridge University Press.

Ragsdale, D. W., K. A. Koch, and C. Grau.  2008.  Secondary Effects of Fungicides, Chapter 14 In Using Foliar Fungicides to Manage Soybean Rust, A. Dorrance, M. Draper, and D. Hershman, [eds.], Land-Grant University Cooperating NCERA-208 and OMAF, SR-2008.  pp. 83-85.  http://oardc.osu.edu/soyrust/

AWARDS AND HONORS:
National Excellence in Research Award for S1039 in 2009, nominated by the Southern Association of Agricultural Experiment Station Directors, 2008 and 2009.
Carol Mortensen Invasive Species Management Award, Minnesota Invasive Species Council, 2008
2005 Entomology Educational Project Award from the Board Certified Entomologists of Mid-America.  Special Project:  “Consensus Recommendation for Soybean Aphid Control”.  Awarded March 2005 at the North Central Branch Meeting, Entomological Society of America.
Outstanding Paper Award, Potato Association of America, for best paper in American Journal of Potato Research, 2002, Awarded July 2003.
Certificate of Appreciation, Minnesota Soybean Research & Promotion Council, Research and Tech Transfer, 2002
Meritorious Service Award, National Potato Council, 2002 (with E. B. Radcliffe)
Recognition Award, Vegetation Management Association of Minnesota, 1998
College of Agriculture’s Nominee for the Horace T. Morse-Minnesota Alumni Association for Outstanding Contributions to Undergraduate Education, 1993
Outstanding Teacher of the College of Agriculture, COA Student Board, 1988-1989
Outstanding Student in Science and Mathematics, Point Loma College, 1973
Pasadena College (now Point Loma College) Scholarship, 1971-1974
President’s Scholarship, 1970-1971