Current research centers on biology and control of fungal diseases of grapes, with current emphasis on powdery and downy mildew, and Botrytis bunch rot. Also, the epidemiology of boxwood blight.
Grapes are one of the fastest growing crops in Virginia, now over 2000 high-value acres, and are considered one of the best alternatives to crops for which profitability has been declining. However, in our humid climate, grape diseases are a constant concern. The most economically profitable varieties of grape are highly susceptible to several diseases, and for this reason grape crops are treated with frequent fungicide sprays. These intensive spray programs and the highly selective nature of modern fungicides entail a serious risk of pathogens becoming resistant to some fungicides. Currently, the only way for a grower to find out that such resistance has developed is to experience a disease control failure, which may cause severe crop loss and even complete crop failure.
Surveys conducted by my lab have discovered that grape downy mildew had developed resistance to strobilurin fungicides in many Virginia locations. Strobilurin fungicides had been playing a major role in grape disease management programs in the eastern USA, and this was the first detection of this type of resistance in grape downy mildew in North America. In addition, powdery mildew resistance to this group was also found, and resistance in both pathogens turned out to be so widespread that use of strobilurins against these diseases is no longer recommended. We have also measured the sensitivity of grape powdery mildew populations to sterol-inhibiting fungicides, another key group, and have documented that reduced sensitivity to the most commonly used compounds is widespread. One case of quinoxyfen resistance of grape powdery mildew has been investigated but appears to be of less practical concern. The most recent discovery is that of grape downy mildew resistance to CAA fungicides (mandipropamid and dimethomorph) in several locations in Virginia and one in North Carolina.
A survey of Botrytis cinerea, the cause of grape bunch rot, revealed the presence in many vineyards of resistance to strobilurins, boscalid, the benzimidazoles, the anilinopyrimidines (cyprodinil and pyrimethanil), and to a much lesser extent fenhexamid.
Our lab also participates in research on boxwood blight and mango anthracnose. Boxwood blight was detected for the first time in the United States in 2011 in North Carolina, Virginia and Connecticut, and has since spread to many states. It is a devastating disease in historic landscapes and in production nurseries. Our research aims to clarify the epidemiology of the disease, and develop strategies to minimize its impact. Further details about this disease may be found on the website maintained by the Virginia Boxwood Blight Task Force.
Ph.D., Plant Pathology, University of California, Riverside, 1981
M.S., Wageningen University, The Netherlands, 1975
- 1987 – present: Associate Professor, Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg
- 1981-1987: Assistant Professor, Department of Plant Pathology, Physiology and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg
- 1980-1981: Postdoctoral Research Scientist, Air Pollution Laboratory, University of California, Riverside.
Selected Major Awards
- 1994: Excellence in Teaching Award, American Phytopathological Society
- 2003: College Certificate of Teaching Excellence, College of Agriculture and Life Sciences, VPI&SU
- 2016: College Certificate of Teaching Excellence, College of Agriculture and Life Sciences, Virginia Tech
- 2017: William E Wine Award for Excellence in Teaching, Virginia Tech
- AT 0434 – Pest Management (diseases and weeds sections)
- PPWS 4104 – Plant Pathology
- PPWS 5204 – Principles of Plant Disease Management
- PPWS 5214 – Diseases of Crop Plants
- PPWS 6004 – (Topics) Epidemiology of Plant Diseases
- PPWS 6004 – (Topics) Identifying Plant Pathogens
Other Teaching and Advising
- Graduate Director, PPWS
- Coordinator of Plant and Pest Management Option Online Master program in Agriculture and Life Sciences,
- 2006-2011. Editor in Chief of The Plant Health Instructor / APS Education Center, an online journal of the American Phytopathological Society focusing on the development of teaching materials
I contribute to outreach to grape growers (communicate research findings and general education on plant diseases and their management), landscape and garden interests (boxwood blight), and master gardener training.
- Avenot, H.F, King, C., Edwards, T.P., Baudoin, A., and Hong, C.X. 2017. Effects of inoculum dose, temperature, cultivar, and interrupted leaf wetness period on infection of boxwood by Calonectria pseudonaviculata. Plant Dis. 101: 866-873.
- Rallos, L.E.E and Baudoin, A. B. 2016. Co-occurrence of two allelic variants of CYP51 in Erysiphe necator and their correlation with over-expression for DMI resistance. PLoS ONE 11: e0148025.
- Colcol, J.F. and Baudoin, A. B.. 2016. Sensitivity of Erysiphe necator and Plasmopara viticola in Virginia and nearby states to QoI fungicides, boscalid, quinoxyfen, thiophanate methyl, and mefenoxam. Plant Disease 100:337-344.
- Baudoin, A., H.F. Avenot, T.P. Edwards, Y. Diallo and C.B. Lucernoni 2015. Evaluation of fungicides for control of boxwood blight, 2014. Plant Disease Management Reports 9: OT006. Online doi:10.1094/PDMR09
- Avenot, H. F., T. P. Edwards, A. Baudoin and C. Hong. 2015. Effects of inoculum concentration, temperature, and interrupted wetness periods on infection of boxwood by Calonectria pseudonaviculata. Phytopathology 105(Suppl. 4):S4.10
- Rouxel, M., Mestre, P., Baudoin, A., Carisse, O., Delière, L., Ellis, M.A., Gadoury, D., Lu, J., Nita, M., Richard-Cervera, S., Schilder, A., Wise, A., and Delmotte, F. 2014. Geographic distribution of species of Plasmopara viticola causing downy mildew on wild and cultivated grapes in eastern North America. Phytopathology 104:692-701.
- Rallos, L. E. E., Johnson, N. G., Schmale D. G. III, Prussin A. J. II, and Baudoin A. B. 2014. Fitness of Erysiphe necator with G143A-based resistance to quinone outside inhibitors. Plant Disease 98: 1494-1502
- Baudoin, A. 2014. First confirmation of resistance to quinoxyfen in grape powdery mildew in North America. (Abstr.) Phytopathology 104(Suppl. 3):S3.160. http://dx.doi.org/10.1094/PHYTO-104-11-S3.160.
- Rallos, L and Baudoin, A. 2013. Target site mutation and cyp51 over-expression as mechanisms of DMI resistance in Erysiphe necator. Phytopathology 103(Suppl. 4):S4.3.
- Baudoin, A. 2013. Survey of fungicide resistance of Botrytis cinerea in Virginia vineyards. (Abstr.) Phytopathology 103(Suppl. 2):S2.1. http://dx.doi.org/10.1094/PHYTO-103-6-S2.1.
- Baudoin, A. 2013. First report of QoI and boscalid resistance of Botrytis cinerea in eastern U.S. vineyards. (Abstr.) Phytopathology 103(Suppl. 4):S4.1. http://dx.doi.org/10.1094/PHYTO-103-10-S4.1
- Colcol, J. F., Rallos, L. E., and Baudoin, A. B. 2012. Sensitivity of Erysiphe necator to demethylation inhibitor fungicides in Virginia. Plant Disease 96: 111-116.
- Rallos, L.E. and A. Baudoin. 2011. Stability of QoI resistance of grapevine powdery mildew in competition experiments and in the field. Phytopathology 101:S274 (Abstract)
- Baudoin, A.B. 2010. Current status of benzimidazole resistance of Erysiphe necator in Virginia. Phytopathology 100: S12 (Abstract)
- Marine, S.C., K.S. Yoder, and A. Baudoin. 2010. 2010. Powdery mildew of apple. The Plant Health Instructor. DOI:10.1094/PHI-I-2010-1021-01
- Baudoin, A., Olaya, G., Delmotte, F., Colcol, J. F., and Sierotzki, H. 2008. QoI resistance of Plasmopara viticola and Erysiphe necator in the mid-Atlantic United States. Online. Plant Health Progress doi:10.1094/PHP-2008-0211-02-RS.
- Baudoin, A.B.A.M. 2007. The Plant Disease Doughnut, a Simple Graphic to Explain what is Disease and what is a Pathogen. The Plant Health Instructor. DOI: 10.1094/PHI-T-2007-1221-01
- Baudoin, A., 2004. Plant Disease Notebook assignment offers students a way to customize a course. The Plant Health Instructor. DOI:10.1094/PHI-T-2004-0317-01
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Mail code: 0331
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Blacksburg, VA 24060