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Robert M. (Bob) Hayes
Director and Professor
Weed Science

Groups and Facilities

(1 mention)

Weed Diagnostics Center 
Diagnostic testing services for weeds of crop and non-cropland systems including turfgrass, ornamentals, and utility rights of way.

(1 mention)

Turfgrass Weeds 
Turfgrass weed management recommendations and publications.



Dicamba Briefing, 11/27/2017

Neal Stewart Nominated for UT Presidentís Discover Award, 10/9/2017

UTIA Faculty Spotlight | Dr. Jim Brosnan, 7/18/2017

High Hopes for Tennessee Cotton, 4/17/2017

Answers to Farmersí Questions, 10/22/2016

Students Win Big at Beltwide, 1/14/2014


(7 mentions)

Weed Research 
A climate that's good for a variety of crops means many types of weeds also thrive. UT AgResearch works to help farmers battle this yearly problem that can greatly affect their yields.

(6 mentions)

Sweet corn 
UT AgResearchers applied herbicides to experimental sweet corn to keep weeds away. But something unexpected happened -- they boosted the nutritional value of the corn.

(4 mentions)

Weed Progress 
Weeds are a nuisance to gardeners, but downright devastating to those who farm for a living. But now experts and farmers say the worst may be behind us.

(1 mention)

Nozzle Selection 
Nozzle selection has been simplified over the years, but different types of nozzles are needed for different situations.

(1 mention)

Weed Olympics 
We've had an Olympic competition here in Tennessee involving ... plants. More specifically, plants we don't like or want. It's called the 'Weed Olympics' on the UT agriculture campus.


Recent Publications

Avoid herbicide resistance by understanding how herbicides work.  Breeden, G. K., J. T. Brosnan, and J. J. Vargas.  2017.  Tennessee Greentimes. 18(3):16-20..

Confirmation and control of annual bluegrass resistant to photosystem II inhibiting herbicides Brosnan, J. T., G. K. Breeden, J. J. Vargas, S. Boggess, R. N. Trigiano, and M. E. Staton.  2017.  International Turf Society Res. Journal, 13:675-680.

A rapid diagnostic assay for detecting herbicide resistance in annual bluegrass.  Brosnan, J. T., J. J. Vargas, E. H. Reasor, and G. K. Breeden.  2017.  Proc. Northeastern Plant Pest and Soils Conference, 2:102.

A Diagnostic Assay to Detect Herbicide Resistance in Annual Bluegrass (Poa annua).  Brosnan, J. T., J. J. Vargas, E. H. Reasor, R. Viggiani, G. K. Breeden, and J. M. Zobel.  2017.  Weed Technology, 31:609-616.

Controlling herbicide resistant annual bluegrass (Poa annua) phenotypes with methiozolin.  Brosnan, J. T., J. J. Vargas, G. K. Breeden, S. L. Boggess, M. E. Staton, P. A. Wadl, and R. N. Trigiano.  2017.  Weed Technology31:470-476.

Two new PPX2 mutations associated with resistance to PPO-inhibiting herbicides in Amaranthus palmeri.  Giacomini, D. A., A. M. Umphres-Lopez, H. Nie, T. C. Mueller, L. E. Steckel, B. G. Young, and P. J. Tranel.  2017.  Pest Management Sci., Pest Management Sci. 73:1559-1563.

Formation of Nanoplastics from Biodegradable Plastic Mulch Films and Characterization of their Behavior in Soil Hayes, D. G., A. Astner, H. M. O'Neill, B. R. Evans, S. V. Pingali, and V. S. Urban.  2017.  BioEnvironmental Polymer Society 24th Annual Meeting, Albany, CA, 20-22 September 2017. [Abstract]

Resistance is Futile: Estimating the Costs of Managing Herbicide Resistance as a First-order Markov Process and the Case of US Upland Cotton Producers Lambert, D. M., J. A. Larson, R. K. Roberts, B. C. English, X. Zhou, L. L. Falconer, R. J. Hogan, J. L. Johnson, and J. M. Reeves.  2017.  Agricultural Economics, 48:387-396. [Abstract]

Utilizing Glyphosate- and Dicamba-Tolerant Soybeans in a Wheat and Hairy Vetch Cover Crop Combination for Controlling Palmer amaranth.  Montogmery, G. B., M. A. McClure, R. M. Hayes, F. R. Walker, S. A. Senseman, and L. E. Steckel.  2017.  Weed Science. [Abstract]

Herbicide and insect resistance Bt cotton pollen assessment finds no detrimental effects on adult honey bees Niu, L., W. Ma, C. Lei, J. L. Jurat-Fuentes, and L. Chen.  2017.  Environmental Pollution, 230: 479-485. [Abstract]

Evaluation of herbicides for ground ivy (Glechoma hederacea) control at two application timings Patton, A. J., L. L. Beck, D. V. Weisenberger, J. T. Brosnan, and G. K. Breeden.  2017.  International Turf Society Res. Journal, 13:692-697.

Comparisons of Herbicides and Application Procedures to Promote Size of Advanced Oak and Yellow-Poplar Reproduction After Harvest.  Peairs, S. E., and W. K. Clatterbuck.  2017.  Proceedings, 19th Biennial Southern Silviculture Research Conference, Virginia Tech University, Blacksburg, VA, March 14-16, 2017. e-Gen. Tech. Rep. SRS-xxx. Asheville, NC: USDA Forest Service, Southern Research Station., p. xxx-xxx.