Nathan Kleczewski Ph.D. – Extension Plant Pathologist

Education

  • 2009 Ph.D. Plant Pathology, The Ohio State University.

Dissertation focused on integration of phytochemical/physiological defense theory in trees and integration with carbon-based models of mycorrhizal regulation.

  • 2004 B.S. Plant Ecology and Organismal Biology, The University of Wisconsin-Oshkosh (Summa Cum Laude)

 

Duties:  Statewide research and extension responsibilities for disease management of field crops

 

As a Extension Plant Pathologist my duties are to identify major disease issues in our crops and conduct applied research to address these issues.  My research program evaluates novel control strategies as components of the integrated disease management of corn, soybeans, wheat, and barley as well as select vegetable crops.

I work closely with other scientists to conduct research relevant to Delaware and the surrounding regions.  Results of my work are shared with regional stakeholders and are presented in peer-reviewed scientific journals, extension publications, conferences, and professional meetings.  Educational programs are aimed at increasing awareness, knowledge, and expertise in plant pathology of certified crop advisers, producers, and other stakeholders.  I also mentor and advise graduate students interested in advanced degrees in applied plant pathology.

 

Current and ongoing applied research in my lab:

  • Best management practices for Fusarium Head Blight of wheat and barley
  • Profitable management of foliar diseases of wheat
  • Foliar diseases of corn and their relationship to stalk and root rots
  • Fungicide resistance development in foliar diseases of corn and soybean
  • Epidemiology of Soybean Vein Necrosis Virus
  • Development and assessment disease control programs in field crops

Other research interests:

  • Interactions between nutrients, plant defense, and microbes
  • Biological control of invasive weeds
  • Mycorrhizal associations of field crops

 

Awards

2014 The American Phytopathological Society

-APS Leadership Institute Fellowship

2008  The Ohio State University Department of Plant Pathology

-C. C. Allison Award for Research and Service

2007 American Phytopathological Society

-Kenneth Barker Student Travel Award

2004 University of Wisconsin-Oshkosh

-Outstanding Biology Major Award

2003 University of Wisconsin-Oshkosh

-Leslie-Allen Fellowship in Ecology and Field Biology

-Excellence in Scholarship Award

2001 University of Wisconsin-Oshkosh

-Outstanding Student in General, Organic, and Biochemistry

 

Selected Publications (Peer Reviewed)

Manamgoda, D.S., A. Minnis, N.M. Kleczewski, S.L. Flory, L.A. Castlebury, and K.D. Hyde. 2013. Bipolaris drechsleri sp. nov. Fungal Planet Description Sheets 213:26.

Minnis A., A.Y. Rossman, N.M. Kleczewski and S.L. Flory. 2012.  Bipolaris microstegii sp. nov. Fungal Planet Description Sheets 129: 151.

Bauer J. T., N. M. Kleczewski, J. D. Bever, K. Clay and H. L. Reynolds. 2012. Nitrogen-fixing bacteria, arbuscular mycorrhizal fungi and the productivity and structure of prairie grassland communities. Oecologia 170(4) 1089-1098.

Kleczewski N.M., S. L. Flory and K. Clay. 2012. Variation in pathogenicity and host range of Bipolaris sp. causing leaf blight disease on the invasive grass Microstegium vimineum. Weed Science 60(3):486-493.

Kleczewski N. M., J. T. Bauer, J. D. Bever, K. Clay and H. L. Reynolds. 2012. A survey of endophytic fungi of switchgrass (Panicum virgatum) in the Midwest, and their putative roles in plant growth. Fungal Ecology 5(5):521-529.

Kleczewski N.M., D.A.Herms and P. Bonello. 2012. Nutrient and water availability alter belowground patterns of biomass allocation, carbon partitioning, and ectomycorrhizal abundance in Betula nigra. Trees: Structure and Function 26(2) 525-533.

Kleczewski N. M. and D. S. Egel, 2011. A diagnostic guide for Fusarium wilt of watermelon. Online. Plant Health Progress. doi:10.1094/PHP-2011-1129-01-DG.

Flory, S.L., N.M. Kleczewski, and K. Clay. 2011. Ecological consequences of pathogen accumulation on an invasive grass. Ecosphere 2(10):12 pp.

Kleczewski N. M. and S. L. Flory. 2010. A new leaf blight disease on the invasive grass Microstegium vimineum caused by a Bipolaris sp. Plant Disease 94(7): 807-811.

Kleczewski N. M., D.A.Herms, and P. Bonello. 2010. Effects of soil type, fertilization and drought on carbon allocation to root growth and partitioning between secondary metabolism and ectomycorrhizae of Betula papyrifera. Tree Physiology 30(7):807-817.

 

Publications (Extension)

Kleczewski, N.M. 2014.  Sclerotinia stem blight (white mold) of soybeans.  University of Delaware Cooperative Extension Factsheet. Available at:  http://extension.udel.edu/factsheet/sclerotinia-stem-blight-white-mold-on-soybean/

Kleczewski, N.M. 2014. Sudden Death of Soybeans.  University of Delaware Cooperative Extension Factsheet. Available at:  http://extension.udel.edu/factsheet/sudden-death-of-soybeans-sds/

Kleczewski, N.M. 2014.  Fusarium Head Blight of Small Grains.  University of Delaware Cooperative Extension Factsheet.  Available at:  http://extension.udel.edu/factsheet/fusarium-head-blight-management-in-wheat/

Kleczewski, N.M. 2014.  Gray Leaf Spot on Corn.  University of Delaware Cooperative Extension Factsheet.  Available at:  http://extension.udel.edu/factsheet/gray-leaf-spot-on-corn/

Kleczewski, N.M. 2014. Stalk Rots on Corn.  University of Delaware Cooperative Extension.  Available at:  http://extension.udel.edu/factsheet/stalk-rots-on-corn/

Kleczewski, N.M. 2014. Frogeye Leafspot of Soybean.  University of Delaware Cooperative Extension Factsheet.  Available at:  http://extension.udel.edu/factsheet/frogeye-leaf-spot-on-soybean-2/

Kleczewski, N.M. 2014. Anthracnose Leaf Blight and Stalk Rot of Corn.  University of Delaware Cooperative Extension Factsheet.  Available at: http://extension.udel.edu/factsheet/anthracnose-leaf-blight-and-stalk-rot-of-corn/

Kleczewski, N.M. et al. 2014.  Commercial Vegetable Production Recommendation Guide.  Cooperative Extension Service, University of Delaware, Newark, DE.

Kleczewski, N.M. 2014.   Cover Story-Coming Clean: Why greenhouse sanitation must be a priority.  Produce Grower Magazine.  Published online at http//www.producemag.com.

Kleczewski, N.M. and D. Egel. 2011. Fungicide resistance management for Indiana Vegetables. Purdue University Factsheet-BP-183-W.

Kleczewski, N.M., and D. Egel. 2011. Greenhouse sanitation for disease management. Purdue University Factsheet-HO-250-W.

Kleczewski, N.M., S.L. Flory, and G. Nice. 2011. An Introduction to Microstegium vimineum Japanese stiltgrass/Nepalese browntop) an Emerging Invasive Grass in the Eastern United States.  Purdue University Factsheet-WS-49-W.

Kleczewski, N.M., P. Bonello, and J. Chatfield. 2009. Pruning and Care of Tree Wounds. Ohio State Factsheet-HYG-3311-09.

Kleczewski, N.M., and D. Lewandowski. 2009.  Virus Diseases of Greenhouse Floral Crops. Ohio State Factsheet-HYG-3065-08.

Kleczewski, N.M, and P. Bonello. 2008. Sudden Oak Death. Ohio State Factsheet-HYG-3309-08.

Kleczewski, N.M., and P. Bonello. 2008. Mycorrhizae in Urban Settings. Ohio State Factsheet-HYG-3305-08.

Kleczewski, N.M., and P. Bonello. 2007. Mycorrhizal inoculations of disturbed soils: What do we know? The Buckeye Arborist 38: 12-14.

Kleczewski, N.M. and P. Bonello. 2007. Mycorrhizal inoculations of disturbed soils: What do we know? The Ohio Woodland Journal 14: 14-15.

Kleczewski, N.M., and P. Bonello. 2007. Feature Article: Commercial inoculation of trees in urban soils:  More questions than answers. The Buckeye, January: 1-8.

 

Memberships and Service

American Phytopathological Society

NCERA 137: Soybean Diseases

NCERA 184: Wheat Diseases

Corn Disease Working Group

Southern Soybean Disease Working Group

Sigma Xi