photo: schneiderRaymond W. Schneider

Professor

302 Life Sciences Bldg.
Address 2: Baton Rouge, LA 70803
Phone: (225) 578-4880
Fax: (225) 578-1415
E-mail: RSchneider@agcenter.lsu.edu

Curriculum Vitae 

 

Education

B.S. in Biology/Chemistry, University of Alabama - 1969
M.S. in Plant Pathology, University of Illinois - 1971
Ph.D. in Plant Pathology, University of Illinois - 1973

Areas of Specialization/Research

Dr. Schneider is indebted to his research associates, graduate and undergraduate students, postdoctoral researchers, visiting scientists, colleagues and collaborators who have contributed their creative energies and hard work to his research program.  He was honored to receive the Tipton Team Research Award twice in recent years.

His research program is centered primarily on soybean pathology with responsibility to provide short- and long-term disease control strategies for this important crop. Several diseases and control strategies and tactics are currently being investigated.  Most of Dr. Schneider’s research career has involved conducting fundamental research on applied problems with the ultimate goals of explaining disease occurrences and discovering solutions for recalcitrant disease situations in several crop species. These mission-oriented research projects have led to significant advances in our understanding of host:pathogen physiology and genetics as well as new strategies and tactics in cultural, chemical and biological control of plant diseases.  Below are brief summaries of some of these accomplishments.  Publications related to these topics can be found in Dr. Schneider’s curriculum vita.   

Cercospora leaf blight of soybean, caused by Cercospora kikuchii, has been a minor disease, but in recent years it has become the most important disease in the state. Current research programs include evaluation of fungicides and times and rates of application for optimal disease control. A more basic thrust utilizes molecular techniques to examine phylogenetic relationships within the genus and to assess genetic diversity in populations of the pathogen in order to determine if new races or biotypes are arising.  Other studies include the effects foliar applications of specific minor elements on infection and disease development.  This project has yielded unexpected levels of disease control especially with iron applications.  Fundamental projects are currently in progress to determine the mechanism(s) involved with these effects.

Schneider’s group (Karol Elias, Monica Lear, Guohong Cai, James Correll, John Puhalla and others) was instrumental in the discovery, description and probable roles of vegetative compatibility groups (VCG’s) in Fusarium oxysporum andCercospora kikuchii.  These studies were later augmented by molecular analyses.  Briefly, by using specific mutants, he and his students and colleagues showed that these two important fungal pathogens undergo hyphal fusions and that genetic information is exchanged by this mechanism (parasexual recombination). They went on to document that there is very little genetic diversity within VCG’s in F. oxysporum and that there are very few VCG’s within formae speciales of this species.  These findings led to the conclusion that pathotypes (races) arise very slowly (approximately every 30 years) in this important pathogen, and breeding for disease resistant to new races offers a viable means of disease management.  In a very intensive study, he and his students and collaborators went on to show that new races arose from the existing population via mutation and selection rather than by genetic recombination.  On the other hand, his group showed that there is a large assortment of VCG’s in C. kikuchii, the soybean leaf blight pathogen, and genetic diversity among VCG’s is very extensive, which suggests that genetic recombination occurs in nature and that there is probably an extant sexual stage.  These findings explained why formerly resistant soybean varieties succumbed to the disease within a few years and why resistance in the pathogen to commonly used fungicides appears to be increasing at a rapid pace.  Schneider was recently awarded a grant from the United Soybean Board to investigate the genetic basis for this extreme level of genetic diversity and to determine the probable limits for the development of new pathotypes.  Given the extreme genetic plasticity of this pathogen, it is apparent that we must develop and evaluate novel means to manage Cercospora leaf blight in soybean.  It is for this reason that Schneider’s group is now heavily involved with exploring disease suppression with certain micronutrients, e.g. iron and aluminum.

Publications

Book Chapters and Other Publications (2008-2013):

Schneider, R. W., Padgett, G. B., Sciumbato, G., and Sikora, E.  2008.  Asian Soybean Rust, the Southern Perspective.  Pages 72-77 in:  Managing Asian Soybean Rust with Fungicides, 2nd Edition.  Dorrance, A. E., Draper, M. A., and Hershman, D. E. (eds.).   The Ohio State University Press.

Schneider, R. W.  2009.  Foliar Diseases of Soybean in the South .  Pest Management Network Webcast. 

Padgett, G. B., Schneider, R. W., and Hollier, C. A. 2011. Soybean disease management.  Louisiana Agriculture 54(2):10-12.

Leonard, B. R.,  Boquet, D. J., Padgett, B., Davis, J. A., Schneider, R. W., Griffin, J. L., Valverde, R. A., and Levy, Jr., R. J.  2011.  Soybean green plant malady: Contributing factors and mitigation.  Louisiana Agriculture 54(2):32-34.

Rush, T.A., Schneider, R.W., Hartman, G.L., Hambleton, S., Ward, N.A., and Aime, M.C. 2011 Validation of diagnostic assays for Phakopsora pachyrhizi in the United States. Inoculum 62:45.

Ward, N. A., Schneider, R. W., and Cai, G.  2014. Cercospora Blight, Leaf Spot, and Purple Seed Stain.  In:  Hartman, G. L. and J. C. Rupe (eds). Compendium of Soybean Diseases.  5th ed.  American Phytopathological Society.  (In Press).

Refereed Journal Articles (2008-2013):

Chanda, A. K., Ward, N. A., Robertson, C. L., Chen, Z.-Y.,  and Schneider, R. W. 2014. Latent infection by Cercospora kikuchii, causal agent of Cercospora leaf blight in soybean.  Phytopathology 104: Accepted.

Walker, D. R.,  Harris, D. K.,  King, Z. R., Li, Z., Boerma, H. R.,  Buckley, J. B.,  Weaver,  D. B.,  Sikora, E. J., Shipe, E. R.,  Mueller, J. D.,   Buck,  J. W., Schneider, R. W.,  Marois, J. J.,  Wright, D. L.,  and Nelson, R. L.  2014. Evaluation of soybean germplasm accessions for resistance to Phakopsora pachyrhizi populations in the southeastern United States, 2009-2012.  Crop Science 54: Accepted.

Chanda, A. K., Chen, Z.-Y., and Schneider, R. W.  2014.  Identification and characterization of light-inducible proteins from Cercospora kikuchii.  Molecular Plant Pathology 15: Submitted.

Gauthier, N. W., Maruthachalam, K., Subbarao, K., Brown, M., Xiao, Y., Robertson, C. L., Giles, C. G., and Schneider, R. W.  2014.  Mycoparasitism of Phakopsora pachyrhizi, the soybean rust pathogen, by Simplicillium lanosoniveum. Biological Control 68: Submitted.

Price, P. P., III, Purvis, M. A., Padgett, G. B., and Schneider, R. W.  2014.  Cercospora leaf blight and purple seed stain in Louisiana soybean.  Plant Health Progress: Submitted.

Robertson,  C. L. and Schneider, R. W. 2014.  Seedling nutrition of Spartina alterniflora and rice: A comparative study.  Journal of Wetlands Ecology: Submitted.

Elmer, W. H., Useman, S., Schneider, R. W., Marra, R. E., LaMondia, J. A., Mendelssohn, I. A., Jimenez,-Gasco, M. M., and Caruso, F. L. 2013. Sudden vegetation dieback in Atlantic and Gulf Coast salt marshes.  Plant Disease 97:436-445.

Ward, N. A., Robertson, C. L., Chanda, A. K. and Schneider, R. W.  2012.  Effects ofSimplicillium lanosoniveum on Phakopsora pachyrhizi, the soybean rust pathogen, and its use as a biological control agent.  Phytopathology 102: 749-760.

Ward, N. A., Schneider, R. W., and Robertson, C. L.  2012.  Documentation of an extended latent infection period of Phakopsora pachyrhizi, the soybean rust pathogen.  Plant Health Progress.  doi:10.1094/PHP-2012-0321-01-RS.

Schneider, R. W. and Durr, E. 2012. Airborne Particulate Sampler. Patent No. US 8,167,986 B2. 14 pp. US Patent and Trademark Office.

Walker, D. R., Boerma, H. R., Phillips, D. V., Schneider, R. W., Buckley, J. B., Shipe, E. R., Mueller, J. D., Weaver, D. B., Sikora, E. J., Moore, S. H., Hartman, G. L., Miles, M. R., Harris, D. K., Wright, D. L., Marois, J. J., and Nelson, R. L. 2011. Evaluation of USDA soybean germplasm accessions for resistance to soybean rust in the southern United States. Crop Science 51:678-693.

Ward, N. A., Schneider, R. W., and Aime, M. C. 2011. Colonization of soybean rust sori by Simplicillium lanosoniveum. Fungal Ecology 4:303-308.

Cai, G. and Schneider, R. W. , and Padgett, G. B.  2009. Assessment of lineages ofCercospora kikuchii in Louisiana for aggressiveness and screening soybean cultivars for resistance to Cercospora leaf blight.  Plant Dis. 93:868-874.

Fixen, P. E., Schneider, R. W., Wright, D. L., Mallarino, A. P., Nelson, K. A., Ebelhar, S. A., and N. A. Slaton.  2008.  Implications for Asian soybean rust in nutrient management – research update.  Better Crops 92:26-29.

Park, Sunjung, Chen, Zhi-Yuan, Chanda, Ashok, Schneider, Raymond W., Hollier, Clayton A. 2008. Viability of Phakopsora pachyrhizi urediniospores under simulated Louisiana winter conditions. Plant Disease 92:1456-1462.

Cai, G. and Schneider, R. W.  2008.  Population structure of  Cercospora kikuchii, the causal agent of  Cercospora leaf blight and purple seed stain in soybean. Phytopathology 98:823-829.

Abstracts and Proceedings (2008-2013):

Mumma, E. P., Schneider, R. W., Wang, J.-J. 2008.  A geographic information systems (GIS) analysis of soybean rust distribution at the field level.   Phytopathology 98:S110 (Abstr.)

Chanda, A. K., Chen, Z.-Y., Schneider, R. W.  2009. Comparison of protein profiles between light- and dark-grown

Cercospora kikuchii.  Phytopathology 99:S20 (Abstr.).

Chanda, A. K., Chen, Z.-Y., Schneider, R. W.  2009. Real-time PCR-based detection and quantification of Cercospora kikuchii in soybean plants.   Phytopathology 99:S197 (Abstr.).

Chanda, A. K., Chen, Z., Schneider, R. W. 2009.  Comparison of protein profiles between light- and dark-grown

Cercospora kikuchii. Phytopathology 99:S20 (Abstr.)

Mumma, E. P., Schneider, R. W., Robertson, C. L.  2009.  Association of specific variables with severity of Asian soybean rust as assessed by GIS analysis at the field level.  Phytopathology 99:S91 (Abstr.)

Schneider, R. W., Haudenshield, J. S.,  Hartman, G. L., and  Mahaffee, W. F. 2009.  Development and use of fluorescent antibody and qPCR protocols for the electrostatic spore trap. Phytopathology 99:S115 (Abstr.)

Ward, N. A., Schneider, R. W., and  Aime, M. C.  2009.  Characterization of a co-inhabitant of uredinia of Asian soybean rust.  Phytopathology 99:S138 (Abst.)

Chanda, A. K.,  Z. Chen, Z., and Schneider, R. W. 2009.  Comparison of protein profiles between light- and dark-grown Cercospora kikuchii. Phytopathology 99:S20 (Abstr.)

Schneider, R. W. 2009. Asian soybean rust four years later: Is the disease a nonstarter or are we still at risk?  Southern Division APS.  Feb 1 – 2, 2009.  Atlanta, GA.  http://www.apsnet.org/meetings/div/so09abs.asp

Ward, N. A., Schneider, R. W. and Aime, M. C. 2009. Uredinia of Asian soybean rust as a unique niche for other fungi.  Southern Division APS.  Feb 1 – 2, 2009.  Atlanta, GA. http://www.apsnet.org/meetings/div/so09abs.asp

Ward, N. A.,  Schneider, R. W., and Brown, M.  2009.  Mycoparasitism of Phakopsora pachyrhizi by Simplicillium lanosoniveum. 2009 National Soybean Rust Symposium, Proceedings. 

Schneider, R. W., Ward, N. A., Robertson, C. L., and Mumma, E. P.  2009. Latent infection, fungicide efficacy and the need for predictive models.  2009 National Soybean Rust Symposium, Proceedings. 

Boudreaux, J.M., J.L. Griffin, B.R. Leonard, R.W. Schneider, and M.E. Salassi.  2010.  Value of paraquat harvest aid in soybean IPM programs.  Proc. South. Weed Sci. Soc. 63:118.

Boudreaux, J. M.,  J. M., Griffin, J. L., Schneider, R. W., and Padgett, G. B.  2010.  Managing Soybean Green Stem:  Paraquat and Sodium Chlorate Application Affects Soybean Harvest and Yield.  Southern Soybean Disease Workers, Proceedings.

Chanda, A. K., Chen, Z., and Schneider, R. W.  2010.  Possible functions of light-induced proteins in cercosporin biosynthesis by Cercospora kikuchii.  Phytopathology 100:S22

Padgett, G. B., Boquet, D., Schneider, R. W., and Purvis, M.  2010.  The Influence of Fungicides, Herbicides, and Water Stress and Their Interactions on Green Bean Syndrome in Soybean.  Southern Soybean Disease Workers, Proceedings.

Schneider, R. W., Padgett, G. B., Boquet, D. J., and Valverde, R. A.  2010.  Factors affecting the development of the green stem malady in soybean.  Phytopathology 100:S115

Ward, N. A., Schneider, R. W., Aime, M. C., Robertson, C. L.  2010.  Leaf Surface Interactions between Phakopsora pachyrhizi, the Soybean Rust Pathogen, and the Mycoparasite Simplicillium lanosoniveum.  Proceedings, The 9th International Symposium of the Microbial Ecology of Aerial Plant Surfaces.  Corvallis, OR.

Ward, N. A., Schneider, R. W., and Robertson, C. L.  2010.  Field evaluations ofSimplicillium lanosoniveum as a biological control agent for Phakopsora pachyrhizi.  Phytopathology 100:S134

Ward, N. A., Schneider, R. W., and Robertson, C. L.  2010.  Field evaluations ofSimplicillium lanosoniveum as a biological control agent for Phakopsora pachyrhizi.  Southern Soybean Disease Workers, Proceedings.

Ward, N. A., Schneider, R. W., Giles, C. G., and Robertson, C. L.  2010.  Development of a screening protocol for assessing baseline sensitivity to fungicides for Phakopsora pachyrhizi, the soybean rust pathogen.  Phytopathology  100:S203.

Chanda, A. K., Chen,  Z., and Schneider,  R. W. 2011. Functional characterization of two genes involved in cercosporin biosynthesis in Cercospora kikuchii.  Phytopathology 101:S30.

Chanda,  A. K., Chen,  Z. , and  Schneider,  R. W.  2011.  The roles of light induced proteins in the biosynthesis of cercosporin by Cercospora kikuchii.  Phytopathology 101:S264.

Robertson, C. L., Ward,  N. A., and Schneider,  R. W. 2011.  Chemical control of Cercospora leaf blight of soybean: Evaluation of fungicide efficacy and time of application.   Phytopathology 101:S268.

Rush, T., Schneider, R. W., Aime, M. C., Ward, N. A. and Hambleton, S.  2011.  Evaluation of the qPCR assay for Phakopsora pachyrhizi.  Proceedings, Southern Soybean Disease Workers.

Rush,  T. A., Schneider,  R. W., Aime,  M. C. , Hartman,  G. L., Hambleton, S., and Ward,  N. A. 2011.  Assessing the validity of diagnostic quantitative PCR assays forPhakopsora pachyrhizi and P. meibomiae.   Phytopathology 101:S157.

Schneider, R. W., Padgett, G. B., Bollich, P., and Romero, G.  2011.  Yield loss models for several soybean diseases and development of a yield loss calculator.  Proceedings, Southern Soybean Disease Workers.

Ward, N. A., Maruthachalam, K., Subbarao, K. V., Brown, M., Xiao, Y., Robertson, C. L., Giles, C. G., Schneider, R. W.  2011.  Mycoparasitism of Phakopsora pachyrhizi bySimplicillium lanosoniveum and its effects on soybean rust:  A microscopy study.  Proceedings, Southern Soybean Disease Workers.

Ward, N. A., Robertson, C. L., Schneider, R. W., Warr,  M. 2011.  Effects of mineral nutrients on Cercospora kikuchii and Cercospora leaf blight in soybean.   Phytopathology 101:S269.

Ward,  N. A. and  Schneider,  R. W. 2011.  Documentation of an extended latent infection period with Phakopsora pachyrhizi in soybean.   Phytopathology 101:S269.

Rush, T. A., Kennedy, B., McTaggart,  A., Heller, G., Toome,  M., Hartman,  G. L., Schneider, R. W., and Aime, M. C.  2012.  Extent of variability of the internal transcribed spacer region within Phakopsora pachyrhizi. Phytopathology 102:S4.103

Schneider, R. W., Robertson, C. L., and Ward, N. A. 2012.  Effects of application timing and rates of application of a demethylation inhibitor fungicide on Cercospora leaf blight of soybean.  Phytopathology 102:S4.107.

Warr, M. R., Rush , T. A., and  Schneider,  R. W.  2012.  Genetic relationships among subpopulations of competitive nonpathogenic strains of Fusarium oxysporum and F. oxysporum f. sp. lycopersici. Phytopathology 102:S4.132.

Schneider, R. W., Clark L. Robertson, Brian M. Ward and Eduardo Chagas Silva. 2013. Optimization of Fungicide Applications for Management of Cercospora Leaf Blight and Rust in Soybean Proceedings, Southern Soybean Disease Workers.

Silva, E. C., B. M .Ward, C. L. Robertson, R. W. Schneider. 2013. Effects of Foliar Applications of Micronutrients on Severity of Rust in Soybean. Proceedings, Southern Soybean Disease Workers.

Ward, B. M., C. L. Robertson, R. W. Schneider and E.C. Silva. 2013. Effects of Minor Element Nutrition on Cercospora Leaf Blight of Soybean Proceedings, Southern Soybean Disease Workers.

Silva, E. C., Robertson, C. L., Schneider, R. W., and Ward, B. M. 2013.  Effects of mineral nutrition on soybean rust and yield.  Phytopathology 103:S2.133.

Ward, B. M., Robertson, C. L., Schneider, R. W., Silva, E. C., ands Albu, S. 2013. Effects of minor elements on Cercospora leaf blight of soybean and production of cercosporin . Phytopathology 103:S2.158