jsm0010Scott McElroy

Professor – Turfgrass/Weed Science

Google Scholar Profile

Crop, Soil and Environmental Sciences

EDUCATION

2003 Ph.D., NC State University (Crop Science)
2000 M.S., Auburn University (Agronomy and Soils)
1998 B.S., Auburn University (Communication)

PROFESSIONAL EXPERIENCE

2017-present Alumni Professor, Auburn University, Crop, Soil and Environmental Sciences
2014-2017 Professor, Auburn University, Crop, Soil and Environmental Sciences
2008-2014 Assistant Professor, Auburn University, Crop, Soil and Environmental Sciences
2003-2007 Assistant Professor, University of Tennessee, Plant Sciences
2001-2003 Graduate Research Assistant, NC State University, Crop Sciences
1998-2000 Graduate Research Assistant, Auburn University, Agronomy & Soils

HONORS AND AWARDS

  • Outstanding Faculty Member Award for the College of Agriculture, Selected by the Auburn University Student Government Association, 2013
  • Outstanding Instructor in Department of Agronomy and Soils, Selected by the Undergraduate Agronomy Club, Auburn University, 2013
  • Outstanding Early Career Weed Scientist, Weed Science Society of America, Baltimore, MD, 2013
  • Outstanding Young Weed Scientist, Southern Weed Science Society, San Juan, Puerto Rico, 2011
  • Director’s Research Award for Junior Faculty, Alabama Agricultural Experiment Station, Auburn University, 2009
  • Outstanding Instructor in the Department of Agronomy and Soils, Selected by the Undergraduate Agronomy Club, Auburn University, 2009, 2013

ELECTED OFFICES

2017-Present Board member — International Turfgrass Society
2012-2016 Executive board member — European Turfgrass Society (International)
2014-2016 Executive board member — Southern Weed Science Society

CURRENT GRADUATE STUDENTS

  • John Peppers, MS, Projected completion December 2019
  • Austin Brown, MS, Projected completion May 2019
  • Suma Basak, PhD, Projected completion August 2019
  • Bo Bi, PhD, Projected completion August 2020
  • Xiaoli MA, PhD, Projected completion August 2020
  • John Petrovsky, MS (Distance), Projected Completion December 2018
  • Hui Zhang, PhD, Projected completion December 2018

FORMER STUDENTS

  • William Head, M.S., Projected Completion December 2016
  • Shu Chen, Ph.D., Projected completion May 2015
  • Philipe Aldahir, Ph.D., Projected completion May 2015
  • Jared Hoyle, Ph.D., Agronomy and Soils (Auburn University), 2012
       Currently Assistant Professor, Kansas State University
  • Hunter Perry, PhD, Agronomy and Soils (Auburn University), 2011
    Currently Research and Development Scientist, Dow AgroSciences, Indianapolis, IN
  • Mark Doroh, M.S., Agronomy and Soils (Auburn University), 2010
    Currently Field Development Scientist, Syngenta, Auburn, AL
  • Michael Flessner, M.S. (2010), PhD (2014), Agronomy and Soils (Auburn University)
    Currently Assistant Professor and Extension Specialist, Virginia Tech University
  • Dustin Lewis, M.S. Plant Sciences (University of Tennessee), 2009
       Completed PhD at NC State University 2012
    Currently Research and Development Scientist, BASF
  • Steven Borst, M.S., Plant Sciences (University of Tennessee), 2008
       Completed PhD at Louisiana State University
    Currently Global Compliance Manager, Alltech Crop Science
  • Matthew Cutulle, M.S., Plant Sciences (University of Tennessee), 2008
       Completed PhD at Virginia Polytechnic and State University
       Currently Assistant Professor, Clemson University
  • James McCurdy, M.S. Plant Sciences (University of Tennessee), 2008;
    PhD Agronomy and Soils (Auburn University), 2014
       Currently Assistant Professor and Extension Specialist, Mississippi State University
  • Ethan Parker, M.S., Crop, Soil, and Environmental Sciences (Auburn), 2014
    Currently Research Scientist, Syngenta Crop Protection
  • Caleb Bristow, M.S. (co-advised with Guertal), Crop, Soil, and Environmental Sciences (Auburn), 2012
    Executive Director, Alabama Peanut Producers

Research ACTIVITIES

My research program has two major focuses:  1) evaluation of herbicides for use in turfgrass management, and, 2) weed genomics and herbicide resistance.  Synthetic herbicides are the most widely used method of weed control in turfgrass management.  New herbicides are being developed to replace older herbicides that have problems with environmental, human, and other non-target toxicity.  New herbicide chemistries have lower active ingredient use rates per area, are more targeted toward plant physiology, and have less chance of non-target contamination.  In general, I conduct research evaluating turfgrass species tolerance and effectiveness of herbicides in controlling major weeds in Alabama.  One specific research focus is controlling annual bluegrass in golf course turfgrass.  Annual bluegrass is one of the most problematic weeds in golf course turf, reducing aesthetic quality and playability.  New herbicides currently being tested could reduce triazine herbicide (atrazine, simazine) use, materials which have been implicated in amphibian reproductive malformations.  Also, research is focused on control of bermudagrass (Cynodon dactylon).  Bermudagrass, while an excellent turfgrass species, is also one of the state’s worst weeds in turfgrass and agriculture in general.  Bermudagrass control is difficult because few selective herbicides are available and control can take up to two to three years.  My research has focused on new chemical control measures for bermudagrass, alternative soil sterilization techniques, and the influence of non-chemical management practices.

The second focus of my research program is on weed genomics, specifically focusing on sequencing and assembling genes associated with herbicide resistance.  Identifying nucleic acid mutations and subsequent amino acid substitutions in herbicide target enzymes is a key component in herbicide resistance management.  Target-site amino acid substitutions can be correlated to various cross-resistance scenarios within herbicide families or modes of action.  In recent years, my lab has begun using next generation sequence (NGS), also referred to as massively parallel sequencing to avoid the many pitfalls of traditional PCR to sequencing approaches.  NGS using the Illumina platform sequences millions of nucleic acid sections, or reads, simultaneously leading to billions of sequenced bases in one sequencing run.  Sequencing reads of 100 to 200 base pair lengths can then be assembled using computational methods to form contiguous sequences, or contigs.  Since weed species are non-model organisms, most with no reference assemblies of key genes, my NGS approach provides a fast approach to resistance mechanism identification.  My lab has current collaborative projects with Clemson, Arkansas, and Georgia faculty to identify molecular mechanisms of resistance in weed species.


MAJOR LAB EQUIPMENT:

We have recently added an entire suite of research equipment available for both physiology and molecular biology research.

Advanced computer workstation including CLC Genomic Workbench for Next Gen Sequencing Analysis

  • StepOnePlus quantitative PCR system
  • Eppendorf Thermal Cycler
  • Standard DNA/RNA extraction equipment
  • Standard nucleic acid electrophoresis equipment
  • Licor 6400 Infrared Gas Analyzer with chlorophyll fluorescence
  • Chlorophyll Fluorescence Imaging System
  • Two portable fluorescence systems
  • Thermo Micropure Water Sterilization
  • Spectrophotoradiometer equipment
  • Licor light meter

Photo of weed physiology sign

Courses Taught

CSES 3120/3123 – Principles of Weed Science
CSES 5160/5163 – Advanced Turfgrass Management
CSES 5200 – Applied Weed Science Technology
CSES 6200 – Applied Weed Science Technology
CSES 6160/6166 – Advanced Turfgrass Management
CSES 6960/6966 – Special Problems

Publications for the previous three years
(asterisks indicates graduate student of Dr. McElroy)

2017

(99) *Flessner ML, McElroy JS, McCurdy JD (2017) Annual bluegrass (Poa annua) control with methiozolin and nutrient tank-mixtures.  Weed Technol. 31:675-681.

(98) McElroy JS, Head WB, Wehtje GR, Spak D (2017) Identification of goosegrass (Eleusine indica) biotypes resistant to preemergence-applied oxadiazon. Weed Technol. 31:765-681

(97) Patton AJ, Trappe JM, Doroh MC, McElroy JS (2017) Evaluation of herbicides and their tank-mixes for suppression of bermudagrass in zoysiagrass.  Inter. Turf. Soc. Res. J. 13:716-722.

(96) *Zhang H, Hall N, McElroy JS, Lowe EK, Goertzen LR (2017) Complete plastid genome sequence of goosegrass (Eleusine indica) and comparison with other Poaceae. Gene 600: 36-43.


2016

(95) Tehranchian P, Norsworthy JK, Korres NE, McElroy S, Chen S, Scott RC (2016) Resistance to aryloxyphenoxypropionate herbicides in Amazon sprangletop: Confirmation, control, and molecular basis of resistance.  Pesticide Biochem. Physiol. 133:79-84.

(94) McCullough PE, Yu J, McElroy JS, Chen S, Zhang H, Grey TL, Czarnota MA (2016) ALS-resistant annual sedge (Cyperus compressus) confirmed in turfgrass.  Weed Technol. 64: 33-41.

(93) *Svyantek AW, Aldahir P, Chen S, Flessner ML, McCullough PE, Sidhu SS, McElroy JS (2016) Target and non-target resistance mechanisms induce annual bluegrass (Poa annua) resistance to atrazine, amicarbazone, and diuron. Weed Technol. 30:773-782.

(92) Grossi N, Fontanelli M, Garramone E, Peruzzi A, Raffaelli M, Pirchio M, Martelloni L, Frasconi C, Caturegli L, Gaetani M, Magni S, McElroy JS, Volterrani (2016) Autonomous mower saves energy and improves quality of tall fescue lawns. HortTechnol. 26:825-830.

(91) McCullough PE, McElroy S, Yu J, Zhang H, Miller T, Chen S, Johnston C, Czarnota M (2016) ALS-Resistant spotted spurge (Chamaesyce maculata) confirmed in Georgia.  Weed Sci. (In press).

(90) *Chen S, McElroy JS, Dane F, Goertzen LR (2016) Transcriptome assembly and comparison of an allotetraploid weed species, annual bluegrass, with its two diploid progenitor species, Poa supina Schrad and Poa infirma Kunth. Plant Genome doi: 10.3835/plantgenome2015.06.0050

(89) *McCurdy JD, McElroy JS, Flessner ML, Hoyle J, Parker E (2015) Tolerance of three trifolium species to common herbicides. Weed Technol. doi: http://dx.doi.org/10.1614/WT-D-15-00062.1


2015

(88) *McCurdy JD, McElroy JS, Flessner ML (2015) Common lespedeza (Kummerowia striata) control within maintained centipedegrass turf.  Crop, Forage, and Turfgrass Management doi:10.2134/cftm2015.0140

(87) *Aldahir PCF, McElroy JS, Flessner ML, Baird JH, Magni S, Grossi N, Lulli F, Volterrani M (2015) Cultural and chemical practices for quality improvement of overseeded bermudagrass [Cynodon dactylon (L.) Pers. X C. transvaalensis Burtt-Davy] and annual bluegrass (Poa annua L.) suppression. J. Environ. Hort. 33:7-14.

(86) *Parker, E.T., G.R. Wehtje, J.S. McElroy, M.L. Flessner, and P. Panizzi. 2015.  Physiological basis for differential selectivity of four grass species to aminocyclopyrachlor.  Weed Sci. 63: 788-798.

(85) Tehranchian, P, D.S. Riar, J.K. Norsworthy, V. Nandula, S. McElroy, S. Chen, and R.C. Scott. 2015. ALS-resistant smallflower umbrella sedge (Cyperus difformis) in Arkansas rice: physiological and molecular basis of resistance.  Weed Sci. 63:561-568.

(84) *Flessner, M.L., J.S. McElroy, J.D. McCurdy, J.M. Toombs, G.R. Wehtje, C.H. Burmester, A.J. Price, and J.T. Ducar. 2015. Glyphosate resistant horseweed (Conyza Canadensis) control with dicamba in Alabama. Weed Technol. 29: 633-640.

(83) Cross, R.B., Bridges, W.C. Bridges, Jr., L.B. McCarty, and J.S. McElroy.  2015 Evaluating annual bluegrass herbicide resistance evolution in golf course fairways.  Weed Technol. 29:488-500.

(82) Cross, R.B., L.B. McCarty, N. Tharayil, J.S. McElroy, S. Chen, P.E. McCullough, B.A. Powell, W.C. Bridges, Jr.  2015. A Pro106 substitution is associated with resistance to glyphosate in annual bluegrass. Weed Sci. 63:613-622.

(81) *Chen, S., J.S. McElroy, F. Dane, E. Peatman.  2015.  Optimizing transcriptome assemblies for leaf and seedling by combining multiple assemblies from three de novo assemblers.  The Plant Genome doi: 10.3835/plantgenome2014.10.0064

(80) Cross, R.B., L.B. McCarty, J.S. McElroy, N. Tharayil, W.C. Bridges, Jr. 2015.  Comparison of enzyme and growth characteristics in ALS-inhibitor susceptible and resistant annual bluegrass biotypes.  Weed Sci. 63:220-228.