Keywords

  • apple diseases
  • apple scab
  • biological control
  • downy mildews
  • epidemiology
  • fruit diseases
  • grape diseases
  • integrated pest management
  • mycology
  • pathogen biology
  • pathogen ecology
  • plant patholgy
  • plant pathology
  • powdery mildew
  • vegetable diseases

Gadoury, David M

Senior Research Associate
Research on such classical diseases as apple scab and grape powdery mildew has been continuous and intensive throughout the last century. However, relatively few investigations have had a major impact upon how we approach controlling those diseases. An overall goal of my research has been to identify those areas of pathogen biology, ecology, and epidemiology that are poorly understood, and which severely constrain our ability to improve disease management programs. The research frequently spans disciplinary, institutional, and international boundaries, and has involved collaborations with horticulturists, food scientists, and entomologists from the other departments at Geneva, and in countries from Norway to Australia.

research

research and scholarship focus

I am particularly intterested in how plant pathogens survive the intercrop period to restart epidemics after a period of overwintering and dormancy. This is an under-researched area and one in whcih I can make meaningful contributions that help stakeholders avoid disease losses.

research areas

affiliations

academic staff in

member of graduate field

teaching

teaching focus

I do not have many opportunities to teach, but I take advantage of those that arise. Being a faculty member at Geneva with experience in turf pathology, I lead the Field Plant Pathology course section on turf diseaes. I also arrange demonstrations and brief lectures for elementary and middle school students during visits to the Experiment Station. These generally occur 3-5 times per year.||More recently, I began to teach, either as a series of 6 lecture, or as two longer seminars, the preparation of conpetitive grant proposals (at Cornell and at Univ. Norway) and writing articles for refereed journals (Univ. Norway).

service

outreach focus

It`s a 2-way street. I use my contact with stakeholders to refine research directions and ideas; to keep them useful and relevant to the industry. It`s also an opportunity to educate the stakeholders in my research findings and their practical application.

current professional activities

  • 1977 Intern, University of Rhode Island Plant Protection Clinic.
  • 1978 Research technician to Dr. Richard Casagrande, Department of Plant Pathology and Entomology, University of Rhode Island.
  • 1978-81 Graduate extension assistant, Department of Botany and Plant Pathology, University of New Hampshire.
  • 1981-84 Graduate research assistant, Department of Botany and Plant Pathology, University of New Hampshire.
  • 1984-85 Research associate, Department of Botany and Plant Pathology, University of New Hampshire. 
  • 1985 Research associate, Department of Botany and Plant Pathology, University of New Hampshire.
  • 1985-89 Research associate II, Department of Plant Pathology, Cornell University, New York State Agricultural Experiment Station, Geneva.
  • 1997-1999 Associate Editor, Plant Disease, Journal of the American Phytopathological Society.
  • 2003-2006 Senior Editor, Australasian Plant Pathology, Journal of the Australasian Society of Plant Pathology

background

educational background

  • Ph.D., (Botany and Plant Pathology), University of New Hampshire, 1984
  • M.S., (Botany and Plant Pathology), University of New Hampshire, 1981
  • B.S., (Agricultural Technology), University of Rhode Island, 1978

awards and distinctions

  • 1991 American Phytopathological Society: Lee M. Hutchins Award (with R.C. Pearson)
  • 1998 Distinguished Visiting Scholar, University of Adelaide, South Australia
  • 1998 Excellence in IPMAward. New York State IPMProgram
  • 1998 CRCV Visiting Scholar. CSIRO, Waite Institute, University of Adelaide
  • 2001 Visiting Scholar, CSIRO Horticulture Unit, Adelaide, South Australia
  • 2003 Visiting Scholar, CSIRO Horticulture Unit, Adelaide, South Australia

featured in

publications

selected publications (listing in progress)

  • Conterno, L., Gadoury, D.M., Gerbi, V., Rolle, L., Seem, R.C., Wilcox, W.F., Zeppa, G., and Henick-Kling, T. 2006. Grape fungal infection and wine quality. Proc. N.Y. Wine Industry Workshop 35:1-5. 128 pp.
  • Gadoury, D.M. and Rumbolz, J.  2006.  Powdery Mildew.  In: Compendium of Grapevine Diseases.  Wilcox, W.F., and Gubler, W.D., (eds).  APS Press. In press.
  • Carroll, J.E., Wilcox, W.F., Seem, R.C., Gadoury, D.M., and Riegel, D.G.  2002.  Different microclimates and powdery mildew severities associated with distance from the water in a ‘Concord’ vineyard adjacent to Lake Erie.  pp 60-61 in: Proc. 4th Int. Workshop on Grapevine Downy and Powdery Mildew, Napa, California, 30 Sept. - 4 Oct., 2002.  UC Davis Press.  88 pp.
  • Gadoury, D.M., Seem, R.C., Wilcox, W.F., and Henick-Kling, T.  2002.  Effects of powdery mildew on bunch rots, berry microflora, and juice and wine quality.  pp 64-65 in: Proc. 4th Int. Workshop on Grapevine Downy and Powdery Mildew, Napa, California, 30 Sept. - 4 Oct., 2002.  UC Davis Press.  88 pp. 
  • Gadoury, D.M., English-Loeb, G., Norton, A., Seem, R.C., Wilcox, W.F., and Melidossian, H.  2002.  A mycophageous mite (Orthotydeus lambi) can suppress powdery mildew (Uncinula necator) in vineyards.  pp 67-68 in: Proc. 4th Int. Workshop on Grapevine Downy and Powdery Mildew, Napa, California, 30 Sept. - 4 Oct., 2002.  UC Davis Press.  88 pp. 
  • Gadoury, D.M., Seem, R.C., Ficke, A., Wilcox, W.F., and Dry, I.B.  2002.  Ontogenic resistance to Uncinula necator in grape berries: Imapccts upon the pathogen, disease progress, and management of powdery mildew.  pp 52-53 in: Proc. 4th Int. Workshop on Grapevine Downy and Powdery Mildew, Napa, California, 30 Sept. - 4 Oct., 2002.  UC Davis Press.  88 pp. 
  • Kennelly, M.M., Seem, R.C., Gadoury, D.M., Wilcox, W.F., and Magarey, P.A.  2002.  Refinement of DMCast, a predictor of grapevine downy mildew.  pp 36-37 in: Proc. 4th Int. Workshop on Grapevine Downy and Powdery Mildew, Napa, California, 30 Sept. - 4 Oct., 2002.  UC Davis Press.  88 pp. 
  • Gadoury, D. M., Seem, R. C., Ficke, A., and Wilcox, W. F. 2001. The epidemiology of powdery mildew on Concord grapes. Phytopathology 91:948-955.
  • Norton, A.P., English-Loeb,  G., Gadoury, D.M., Seem, R.C., and Wilcox, W.F.  2001.  Current and future research on the biological control of powdery mildew using fungal feeding mites.  Proceedings Partnerships for Sustaining California Agriculture: Profit, Environment, and Communnity.  27-28 March 2001.  Davis, CA.
  • Stensvand, A., Gadoury, D.M., Amundsen, T., and Seem, R.C.  2000.  Recent research on ascospore discharge in Venturia inaequalis.  IOBC Bull.23:39-51. 
  • English-Loeb, G., Norton, A.P., Gadoury, D.M., Seem, R.C., and Wilcox, W.F.  1998.  Mycophageous mites as regulators of powdery mildew on grape.   p. 41 in: Proceedings of the 3rd Int. Workshop on Grapevine Downy and Powdery Mildew, Loxton, Australia, 21-28 March 1998.  62 pp.
  • Gadoury, D.M., Seem, R.C., and Wilcox, R.C.  1998.  The early development of ontogenic resistance to powdery mildew in fruit of Vitis labruscana and Vitis vinifera grapevines.  p. 36 in: Proceedings of the 3rd Int. Workshop on Grapevine Downy and Powdery Mildew, Loxton, Australia, 21-28 March 1998.  62 pp.
  • Gadoury, D.M., Seem, R.C., Wilcox, W.F., and Travis, J.W.  1998.  Forecasts of grape downy mildew for New york and Pennsylvania regional IPM programs.  p. 5 in: Proceedings of the 3rd Int. Workshop on Grapevine Downy and Powdery Mildew, Loxton, Australia, 21-28 March 1998.  62 pp.
  • Schneider, S., Gadoury, D.M., and Kassemeyer, H.-H.  1998.  The role of cleistothecia in the epidemiology of grape powdery mildew in Germany.  p. 53 in Proc. 3rd Int. Workshop on Powdery and Downy Mildew of Grapevine.  22-28 March 1998.  Loxton, SA, Australia.  62 pp.
  • Trail, F., Gadoury, D.M., and Loranger, R.  1998.  Environmental parameters of ascospore discharge in Gibberella zeae.  pp. 11-13 in Proc. National Fusarium Head Blight Forum.  Mich. State Univ., East Lansing, 26-27 Oct. 1998.
  • Schneider, S., Gadoury, D.M., and Kassemeyer, H.-H.  1997.  The role of cleistothecia in the epidemiology of grape powdery mildew in Germany.  Proc. A.N.P.P. 5th Int. Conf. Plant Dis.  3-5 December 1997. Tours, France.
  • Seem, R.C., and Gadoury, D.M.  1996.  Weather and prediction of disease risk in vineyards.  Proc. 25th N.Y. Wine Industry Workshop.  N.Y. Agric. Exp. Stn. 144 pp.
  • Gadoury, D.M.  1995.  Controlling fungal diseases of grapevine under organic management practices.  N.Y. Agric. Exp. Stn. Special Rep. 69:35-44.
  • Cortesi, P., Gadoury, D.M., Seem, R.C., and Pearson, R.C.  1994.  Distribution and retention of clesitothecia of Uncinula necator on the bark of grapevines.  p. 41 in: Proceedings of the 3rd Int. Workshop on Grapevine Downy and Powdery Mildew Modeling, Freiburg, Germany, 29 Aug. - 1 Sept. 1994.  131 pp.
  • Gadoury, D.M., Pearson, R.C., and Seem, R.C.  1994.  An integrated control program for fungal diseases of Vitis vinifera and Vitis interspecific hybrid cultivars in the northeastern United States.  pp. 37-40 in: Proceedings of the 2nd Int. Workshop on Grapevine Downy and Powdery Mildew Modeling, Freiburg, Germany, 29 Aug. - 1 Sept. 1994.  131 pp.
  • Gadoury, D.M., and Seem, R.C. (eds.).  1994.  Proceedings of 1st Int. Workshop on Grapevine Downy Mildew.  N.Y. Agric. Exp. Stn. Special Rep. 68.  121 pp.
  • Gadoury, D.M., Seem, R.C., Magarey, P., Emmett, R., and Magarey, R.  1994.  Development of a practical model for use in the management of grape powdery mildew.  pp. 126-128 in: Proceedings of the 2nd Int. Workshop on Grapevine Downy and Powdery Mildew Modeling, Freiburg, Germany, 29 Aug. - 1 Sept. 1994.  131 pp.
  • Magarey, P.A., Emmett, R.W., Gadoury, D.M., Biggins, L.T., Clarke, K., Magarey, R.D., Wachtel, M.F., Masters, J., and Wilkins, B.J.  1994.  Cleistothecia are a source of inoculum for Uncinula necator in Australian vineyards.  p. 119 in: Proceedings of the 2nd Int. Workshop on Grapevine Downy and Powdery Mildew Modeling, Freiburg, Germany, 29 Aug. - 1 Sept. 1994.  131 pp.
  • Park, E.W., Seem, R.C., Pearson, R.C., and Gadoury, D.M.  1994.  DMCAST: A forecasting model for grape downy mildew development. In: Gadoury, D.M., and Seem, R.C. (eds.).  Proceedings of 1st Int. Workshop on Grapevine Downy Mildew.  N.Y. Agric. Exp. Stn. Special Rep. 68.  121 pp.
  • Seem, R.C., Gadoury, D.M., Park, E.W., and Pearson, R.C.  1994.  Validation studies on DMCAST: a forecast model for grape downy mildew.  pp. 84-87 in: Proceedings of the 2nd Int. Workshop on Grapevine Downy and Powdery Mildew Modeling, Freiburg, Germany, 29 Aug. - 1 Sept. 1994.  131 pp.
  • Travis, J., Muza, A., Daskopoulos, D., Pearson, R.C., Gadoury, D.M., Becker, C.M., Ellis, M., and Ramsdell, D.  1994.  VITIS, a grape disease management expert system.  In: Gadoury, D.M., and Seem, R.C. (eds.).  Proc. 1st Int. Workshop on Grapevine Downy Mildew.  N.Y. Agric. Exp. Stn. Special Rep. 68.  121 pp.
  • Gadoury, D.M.  1993.  Management of multiple pests in fruit crops.  pp 110-118 in: Gadoury, D.M., and Seem, R.C. (eds.).  1993.  Proceedings of 1st Int. Workshop on Grapevine Downy Mildew.  N.Y. Agric. Exp. Stn. Special Rep. 68.  121 pp.
  • Gadoury, D.M., Seem, R.C., and Stensvand, A.  1993.  Maturation and release of ascospores of Venturia inaequalis in laboratory and controlled field studies.  Bull. International Organisation for Biological Control (in press).
  • Pearson, R.C., and Gadoury, D.M.  1992.  Grape powdery mildew, in: Plant Diseases of International Importance, Vol. III, Diseases of Fruit Crops. Kumar, J., Chaube, H.S., Singh, U.S., and Mukhopadhyay, A.N., (eds.), Prentice Hall, N.J.  456 pp.
  • Refereed Journal Papers
  • English-Loeb, G., Norton, A.P., Gadoury, D.M., Seem, R., and Wilcox, W. 2005. Tri-trophic interactions among grapevines, a fungal pathogen, and a mycophagous mite. Ecol. Applications 15:1679-1688.
  • Kennelly, M. M., Gadoury, D. M., Wilcox, W. F., Magarey, P. A., and Seem, R. C. 2005. Seasonal development of ontogenic resistance to downy mildew in grape berries and rachises. Phytopathology 95:0000-0000 (in press).
  • Melidossian, H.S., Seem, R.C., English-Loeb, G., Wilcox, W.F., and Gadoury, D.M. 2005. Suppression of grapevine powdery mildew by a mycophagous mite. Plant Dis. 88:0000-0000 (in press).
  • Stensvand, A., Eikemo, H., Gadoury, D.M., and Seem, R.C. 2005. Use of a rainfall frequency threshold to adjust a degree-day model of ascospore maturity of Venturia inaequalis. Plant Disease 89:198-202.
  • Magarey, R.D., Russo, J.M., Seem, R.C., and Gadoury, D.M. 2005. Surface wetness duration under controlled conditions. Agric. Forest Meteorol. 128: 111-122.
  • Hoffman, L.E., Wilcox, W.F., Gadoury, D.M., Seem, R.C., and Riegel, D.G. 2004. integrated control of grape black rot: influence of host phenology, inoculum availability, sanitation, and spray timing. Phytopathology 94:641-650.
  • Gadoury, D.M., Seem, R.C., MacHardy, W.E., Wilcox, W.F., Rosenberger, D.A., and Stensvand, A.  2004.  A comparison of methods used to estimate the maturity and release of ascospores of Venturia inaequalis.  Plant Dis. 88:869-874.
  • Ficke, A., Gadoury, D.M., Seem, R.C, Godfrey, D., and Dry, I.B. 2004.  Host barriers and responses to Uncinula necator in developing grape berries.  Phytopathology 94:438-445.
  • Reisch, B.I., Kikkert, J., Vidal, J., Ali, G.S., Gadoury, D.M., Seem, R.C., and Wallace, P.  2003.  Genetic transformation of Vitis vinifera to improve disease resistance.  Acta Horticuturae 603:303-308.
  • Ficke, A. Gadoury, D.M. Seem, R.C., and Dry, I.B. 2003. Effects of ontogenic resistance upon establishment and growth of Uncinula necator on  grape berries.  Phytopathology 93:556-563.
  • Gadoury, D.M., Seem, R.C., Ficke, A., and Wilcox, W.F.  2003.  Ontogenic resistance to powdery mildew in grape berries .  Phytopathology 93:547-555.
  • Ficke, A. Gadoury, D.M., and Seem, R.C.  2002.  Ontogenic resistance and plant disease management: A case study of grape powdery mildew.  Phytopathology 92:671-675.
  • Trail, F., Xu, H., Loranger, R., and Gadoury, D.  2002.  Physiological and environmental aspects of ascospore discharge in Gibberella zea (anamorph Fusarium graminearum).  Mycologia 94:181-189.
  • Hoffman, L.E., Wilcox, W.F., Gadoury, D.M., and Seem, R.C.  2002.  Influence of grape berry age on susceptibility to Guignardia bidwellii and its incubation period length.  Phytopathology 92:1068-1076.
  • Gadoury, D.M., Seem, R.C., Wilcox, W.F., Conterno, L., and Henick-Kling, T.  2002.  Effetto dell’infezione oidica sulla qualitá del mosto e del vino.  Informatore Fitopatologico 4:28-32.
  • MacHardy, W.E., Gadoury, D.M., and Gessler, C.  2001.  Parasitic and biological fitness of Venturia inaequalis: relationship to disease management strategies.  Plant Dis. 85:1036-1051.
  • Gadoury, D.M., Seem, R.C., Pearson, R.C., Wilcox, W.F., and Dunst, R.M.  2001.  Effects of powdery mildew on vine growth, yield, and quality of Concord grapes.  Plant Dis. 85:137-140.
  • Norton, A.P., English-Loeb, G., Gadoury, D.M., and Seem, R.C.  2000.  Mycophagous mites and foliar pathogens: leaf domatia mediate a plant-arthopod mutualism.  Ecology 81:490-499.
  • Gee, L., Stummer, B., Gadoury, D.M., Biggins, L.T., and Scott, E.  2000.  Maturation of cleistothecia of Uncinula necator (powdery mildew) and release of ascospores in southern Australia.  Australian J. Grape and Wine Res. 6:13-20.
  • English-Loeb, G., Norton, A.P., Gadoury, D.M., Seem, R.C.  and Wilcox, W.F.  1999.  Control of powdery mildew in wild and cultivated grapes by a tydeid mite.  Biol. Control 14:97-103.
  • Gadoury, D.M., Stensvand, A., and Seem, R.C.  1998.  Influence of light, relative humidity, and maturity of populations on discharge of ascospores of Venturia inaequalis.  Phytopathology 88:902-909.
  • Stensvand, A., Amundsen, T., Semb, L., Gadoury, D.M., and Seem, R.C.  1998.  Discharge and dissemination of ascospores by Venturia inaequalis during dew.  Plant Dis. 82:761-764.
  • Cortesi, P., Gadoury, D.M., Seem, R.C., and Pearson, R.C.  1997.  Distribution and retention of cleistothecia of Uncinula necator on the bark of grapevines.  Vitic. Enol. Sci. 52:196-198.
  • Cortesi, P., Bisiach, M.,  Ricciolini, M., and Gadoury, D.M.  1997. Cleistothecia of Uncinula necator are an additional source of inoculum in Italian vineyards. Plant. Dis. 81:922-926.
  • Gadoury, D.M., Pearson, R.C., Seem, R.C., and Park, E.W.  1997.  Integrating the control programs for fungal diseases of grapevine in the northeastern United States.  Vitic. Enol. Sci. 52:140-147.
  • Gadoury, D.M., Seem, R.C., Magarey, P.A., Emmett, R., and Magarey, R.  1997.  Effects of environment and fungicides on epidemics of grape powdery mildew: considerations for practical model development and disease management.  Vitic. Enol. Sci. 52:225-229.
  • Magarey, P.A., Gadoury, D.M., Emmett, R.W., Biggins, L.T., Clarke, K., Wachtel, M.F., Wicks, T.J., and Seem, R.C.  1997.  Cleistothecia of Uncinula necator in Australia.  Vitic. Enol. Sci. 52:210-218.
  • Park, E.W., Seem, R.C., Gadoury, D.M., and Pearson, R.C.  1997.  DMCAST: a prediction model for grape downy mildew development.  Vitic. Enol. Sci. 52:182-189.
Keywords: apple diseases, apple scab, biological control, downy mildews, epidemiology, fruit diseases, grape diseases, integrated pest management, mycology, pathogen biology, pathogen ecology, plant patholgy, plant pathology, powdery mildew, vegetable diseases