Dr. Megan Dewdney

Dr. Megan Dewdney


Program Emphasis

Extension responsibilities focus on integrated management and control measures for citrus canker and citrus greening with additional responsibilities for fungal pathogens. Research projects include better understanding the biology of both bacterial and fungal pathogens to lead to enhanced control.

Education

Ph.D. Plant Pathology, New York State Agricultural Experiment Station (NYSAES), Cornell University, Geneva NY

M.Sc. Plant Science with specialization in Plant Pathology, McGill University, Montréal PQ, Canada

B.Sc. Plant Science, University of British Columbia, Vancouver BC, Canada

Past Positions

Graduate Research Assistant, 2001-2007. NYSAES Cornell University, Geneva NY

Graduate Research Assistant, 1998-2000. McGill University, Montréal PQ

Refereed Papers

Vega, B., and Dewdney, M. M. 2014. Sensitivity of Alternaria alternata from citrus to boscalid and polymorphism in the iron-sulfur and in the anchored membranes subunits of succinate dehydrogenase. Plant Disease 98: (accepted). http://dx.doi.org/10.1094/PDIS-04-14-0374-RE.

Vega, B., and Dewdney, M. M. 2014. QoI-resistance stability in relation to pathogenic and saprophytic fitness components of Alternaria alternata from citrus. Plant Disease 98: 1371-1378. http://dx.doi.org/101094/pdis-01-14-0078-re.

Hincapie, M., Dewdney, M.M., and Peres, N.A. 2014. Baseline sensitivity of Guignardia citricarpa isolates from Florida to azoxystrobin and pyraclostrobin. Plant Disease 98: 780-789. http://dx.doi.org/10.1094/PDIS-03-13-0335-RE.

Vega, B. and Dewdney, M.M. 2014. Distribution of QoI resistance in populations of tangerine-infecting Alternaria alternata in Florida. Plant Disease 98: 67-76. http://dx.doi.org/10.1094/PDIS-04-13-0449-RE.

Hu, J., Wang, N.-Y., and Dewdney, M.M. 2014. qPCR quantification of pathogenic Guignardia citricarpa and non-pathogenic G. mangiferae in citrus. Plant Disease 98: 112-120. http://dx.doi.org/10.1094/PDIS-04-13-0465-RE.

Zortea, T. Fraisse, C.W., and Dewdney, M.M. 2013. Development of a web-based system to optimize copper application in citrus groves. Applied Engineering in Agriculture 29: 893-903. http://dx.doi.org/10.13031/aea.29.10139.

Huang, F., Hou, X., Dewdney, M.M., Fu, Y., Chen, G., Hyde, K.D., Li, H. 2013. Diaporthe species occurring on Citrus in China. Fungal Diversity 61: 237-250. http://dx.doi.org/10.1007/s13225-013-0245-6.

Vega, B., Liberti, D., Harmon, P. F., and Dewdney, M.M. 2012. A rapid resazurin-based microtiter assay to evaluate QoI sensitivity for Alternaria alternata and their molecular characterization. Plant Disease 96: 1262-1270. http://dx.doi.org/10.1094/PDIS-12-11-1037-RE.

Schubert, T.S., Dewdney, M.M., Peres, N.A., Palm, M.A., Jeyaprakash, A., Sutton, B. Mondal, S.N., Wang, N.-Y., Rascoe, J. and Picton, D.D. 2012. First report of Guignardia citricarpa associated with citrus black spot on sweet orange [Citrus sinensis (L.) Osbeck] in North America. Plant Disease 96: 1225. http://dx.doi.org/10.1094/PDIS-01-12-0101-PDN.

Mondal, S.N., Dutt, M., Grosser, J. and Dewdney, M.M. 2012. Transgenic citrus expressing the antimicrobial gene Attacin E (attE) reduces the susceptibility of 'Duncan' grapefruit to the citrus scab caused by Elsinoë fawcettii. European Journal of Plant Pathology 133: 391-404. http://dx.doi.org/10.1007/s10658-011-9912-1.

Dewdney, M.M., Biggs, A.R., and Turechek, W.W. 2007. A statistical comparison of the blossom blight forecasts of MARYBLYT™ and Cougarblight with receiver operating characteristic (ROC) curve analysis. Phytopathology 97: 1164-1176. http://dx.doi.org/10.1094/PHYTO-97-9-1164.

Dewdney, M.M., Charest, J., Paulitz, T.C., and Carisse, O. 2003. Multivariate analysis of apple cultivar susceptibility to Venturia inaequalis under greenhouse conditions. Canadian Journal of Plant Pathology 25(4): 387-400. http://dx.doi.org/10.1080/07060660309507095.

Carisse, O. and Dewdney, M.M. 2002. A review of non-fungicidal approaches for the control of apple scab. Phytoprotection: 83: 1-29. http://dx.doi.org/10.7202/706226ar

Charest, J., Dewdney M., Paulitz, T., Philion V., and Carisse, O. 2002. Spatial distribution of Venturia inaequalis airborne ascospores in orchards. Phytopathology 92: 769-779. http://dx.doi.org/10.1094/PHYTO.2002.92.7.769.

Non-Refereed Proceedings

Vega, B. and Dewdney, M.M. 2012. Geographical distribution of strobilurin resistance of Alternaria alternata, causal agent of alternaria brown spot in Florida citrus groves. Proceedings of the Florida State Horticultural Society 125: 33-35.

Graham, J.H., Dewdney, M.M. and Yonce, H.D. 2011. Comparison of copper formulations for control of citrus canker on 'Hamlin' orange. Proceedings of the Florida State Horticultural Society 124: 79-84

Graham, J.H., Dewdney, M.M. and Myers, M.E. 2010. Streptomycin and copper formulations for control of citrus canker on grapefruit. Proceedings of the Florida State Horticultural Society 123: 92-99.

Dewdney, M.M., Seem, R.C. and Aldwinckle, H.S. 2008. The effect of apple blossom age on populations of Erwinia amylovora on the stigma surface. Acta Horticulturea 793:99-104.

Dewdney, M.M., Svircev, A.M., Kim, W.-S., Seem, R.C. and Aldwinckle, H.S. 2008. How cool temperatures affect Erwinia amylovora populations on the apple stigma surface. Acta Horticulturea 793: 33-38.

Dewdney, M.M., Biggs, A.R., and Turechek, W.W. 2006. A statistical comparison of MARYBLYT™ and Cougarblight with sensitivity analysis. Acta Horticulturea 704: 171-176.

Charest, J., Dutilleul, P., Dewdney M., Paulitz, T., Philion V., and Carisse, O. 2000. Study of spatial distribution of Venturia inaequalis ascospores in a commercial apple orchard. IOBC wprs Bulletin 23: 191-198.

Dewdney, M., d'Estienne, B., Charest, J., Paulitz, T., and Carisse, O. 2000. Relative cultivar susceptibility to Venturia inaequalis ascospores under greenhouse conditions. IOBC wprs Bulletin 23: 199-205.

Trade Journal

Dewdney, M.M., Roberts P. 2014. Citrus Black Spot Fungicide Trials 95(5). 14-15. PDF

Dewdney, M.M. 2014. The Fungi Never Rest 95(2). 6-9. PDF

Dewdney, M.M. 2013. The State of Black Spot in Florida. Citrus Industry 94(11). 12-14. PDF

Dewdney, M.M., Fraisse C., Zortea T. 2013. Optimization of copper application timing 94(4). 26-30. PDF

Dewdney, M.M. 2013. What is happening with the fungi? 94(3). 26-30. PDF

Dewdney, M.M., Burrow J.D. 2013. Communicating in the 21st Century 94(1). 22-22. PDF

Dewdney, M.M. 2012. Fungi in my neighborhood. Citrus Industry 93(2). 12-14. PDF

Dewdney, M.M. 2012. Alternaria brown spot. Citrus Industry 93(2). 28. PDF

Dewdney, M.M. 2012. Citrus scab. Citrus Industry 93(3). 30. PDF

Graham, J.H. and Dewdney, M.M. 2012. Research progress on management of Citrus Canker. Citrus Industry 93(3). 15-17. PDF

Dewdney, M.M. 2012. Melanose. Citrus Industry 93(4). 24. PDF

Dewdney, M.M. 2012. Greasy spot. Citrus Industry 93(5). 11. PDF

Dewdney, M.M. 2012. Asian citrus canker. Citrus Industry 93(6). 32-33. PDF

Dewdney, M.M. 2012. Huanglongbing. Citrus Industry 93(8). 40-41. PDF

Dewdney, M.M. 2012. Psorosis. Citrus Industry 93(10). 18-19. PDF

Ritenour, M.A., Dewdney, M.M. 2012., Zhang, Z. and Narciso. J. Decay control of fresh citrus. Citrus Industry 93(10). 6, 8-10. PDF

Vega, B. and Dewdney, M.M. 2012. Status of resistance of alternaria to fungicides in tangerine production. Citrus Industry 93(11). 14, 16-17. PDF

Dewdney, M.M. 2012. Algal disease. Citrus Industry 93(11). 20. PDF

Dewdney, M.M. 2012. Ganoderma root rot. Citrus Industry 93(12). 37. PDF

Dewdney, M.M. 2012. Disease of the month: Back Spot. Citrus Industry 93(1). 23. PDF

Dewdney, M.M. 2011. Exotic diseases. Citrus Industry 92(1). 22, 24- 26, 28. PDF

Timmer, L.W., Bove, J.M., Ayres, A.J., Bassanezi, R.B., Belasque Jr, J., Chamberlain, H.L., Dawson, W.O., Dewdney, M.M., Graham J.H. and Irey, M. 2011. HLB: It's not too late - yet . Citrus Industry 92(1). 6-7. PDF

Dewdney, M.M. and Peres, N.A. 2011. What to do about citrus black spot. Citrus Industry 92(2). 10, 12. PDF

Graham, J.H. and Dewdney, M.M. 2011. Citrus canker management update. Citrus Industry 92(3). 6, 8-10. PDF

Spann, T.M. and Dewdney, M.M. 2011. Good sanitation practices of citrus nurseries. Citrus Industry 92(5). 28, 30. PDF

Dewdney, M.M., Fraisse, C., Zortea, T. and Yates, J.D. 2011. Refreshed and renewed: the citrus copper application scheduler. Citrus Industry 92(7). 20-22. PDF

Dewdney, M.M., Schubert, T., Estes, E. 2011. Rules and regulations for fruit movement and handling from CBS-infected areas. Citrus Industry 92(9). 8-10. PDF

Graham, J.H. and Dewdney, M.M. 2010. Management Recommendations for Citrus Canker in 2010. Citrus Industry 91(3). PDF

Dewdney, M.M. 2010. Fungicide resistance: Why it happens and how it may affect you. Citrus Industry 91(3). PDF

Dewdney, M.M. 2010. Citrus black spot. Citrus Industry 91(1): 21. PDF

Spann, T.M., Atwood, R.A., Dewdney, M.M., Ebel, R.C., Ehsani, R., England, G., Futch, S.H., Gaver, T., Hurner, T., Oswalt C.W., Rogers, M.E., Roka, F.M., Ritenour, M.A. and Zekri, M. 2010. IFAS guidance for huanglongbing (greening) management. Citrus Industry 91 (4). 6-13. PDF

Duncan, L. W., Graham J.H. and Dewdney, M.M. 2010. Remember Diaprepes? It's still a problem. Citrus Industry 91 (7). 10-14. PDF

Dewdney, M.M., Peres, N.A., Schubert, T., Atwood, R.A., England, G., Futch, S.H., Gaver, T., Hurner, T., Oswalt C.W., Rogers, M.E., Roka, F.M., Ritenour, M.A. and Zekri, M. 2010. Citrus black spot in Florida. Citrus Industry 91 (7). 18-21. PDF

Ritenour, M.A. and Dewdney, M.M. 2010. Fresh citrus issues: black spot, canker and MRLs. Citrus Industry 91(10). 18-19. PDF

Dewdney, M.M. 2009. Fungi on my mind. Citrus Industry 91(2): 19-20. PDF

Dewdney, M.M. 2009. An update on plant pathology research funded by the Florida citrus production research advisory Council. Citrus Industry 90(12): 18-21. PDF

Dewdney, M.M. and Graham, J.H. 2009. Cooperative Producers keep greening disease under control. Citrus Industry 90 (9): 3-8. PDF

Dewdney, M.M. and Timmer, L.W. 2009. Citrus production and diseases in Ghana. Citrus Industry 90(5): 10-13. PDF

Graham, J.H. and Dewdney, M.M. 2009. Management Recommendations for Citrus Canker in 2009. Citrus Industry 90(2): 22-25, 31. PDF

Dewdney, M.M. 2009. Fungal Foliar Diseases: A Refresher. Citrus Industry 90(2): 18-21. PDF

Spann, T.M., L.G. Albrigo, Graham J.H., M.M. Dewdney, M. Ritenour and J.P. Syvertsen. 2009. South China HLB Tour and the International Citrus Congress 2008. Citrus Industry 90 (1): 20-23. PDF

Extension Articles

Dewdney, M.M., Roberts, P.D., Graham, J.H., Chung, K.-R. and Zekri, M. 2009. Homeowner fact sheet: Citrus canker (PP194). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Timmer L.W. 2009. Alternaria brown spot (PP152). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Yates, J.D. 2009. Foliar fungal disease management for commercial citrus groves (PP270). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Yates, J.D. 2009. Phytophthora management for commercial citrus groves (PP269). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Yates, J.D. 2009. Phytophthora-related diseases identification sheet (PP262). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Yates, J.D. 2009. Citrus foliar fungal diseases identification sheet (PP261). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M., Yates, J.D., Brlansky, R.H., Spann, T.M. and Rogers, M.E. 2009. Citrus greening, blight and tristeza comparison identification sheet (PP263). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M., Yates, J.D., Rogers, M.E. and Spann, T.M. 2009. Exotic diseases of citrus identification sheet (PP264). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Dewdney, M.M. and Aldwinckle, H.S. 2008. Blossom blight epidemiology. New York Fruit Quarterly 16:17-22.

Yates, J.D., Dewdney, M.M. and Brlansky, R.H. 2008. Exotic citrus diseases: Early detection is the solution to protecting Florida citrus (CH202). Gainesville: University of Florida Institute of Food and Agricultural Sciences. PDF

Yates, J.D., Spann, T.M., Rogers, M.E., and Dewdney, M.M. 2008. Citrus Canker: An Established Infection in the Florida Citrus Industry (CH199). Gainesville, FL: University of Florida, IFAS. PDF

Yates, J.D., Spann, T.M., Rogers, M.E., and Dewdney, M.M. 2008. Citrus Greening: A Serious Threat to the Florida Citrus Industry (CH198). Gainesville, FL: University of Florida, IFAS. PDF