Shawn Askew

Associate Professor

Program Focus

The research endeavors of Dr. Askew's position are closely tied to his extension activities. Research efforts of his program include: development and evaluation of new herbicides on site and in the lab/glasshouse, evaluation of organic and cultural weed control, new diagnostic and application technology, and environmental effects of weed management in turfgrass. Dr. Askew also manages the Phytochemistry and Radioactive Materials laboratory at the Glade Road Research Facility where his team conducts research on herbicide physiology and herbicide-resistant weeds.

Current Projects

Dr. Askew has generated and spent over $2.0 million in the past decade for research endeavors aimed at improving weed management programs for Virginia turfgrass managers.  Most of his grant funding comes from corporate partners, the Virginia Turfgrass Foundation, Virginia Golf Course Superintendents Association, and the Virginia Department of Transportation.  The following are short titles of projects underway by his current graduate students:

  • Improved seedhead supression via winter applications of ethephon
  • Mode of action and mechanism of selectivity for annual bluegrass control on golf putting greens by methiozolin
  • Characterizing herbicide resistant annual bluegrass, goosegrass, perennial ryegrass, and buckhorn plantain
  • Developing goosegrass control programs in warm-season turfgrass
  • Measuring the influence of annual bluegrass and other putting green surface factors on golf ball trajectories

Education

Ph.D. Crop Science, North Carolina State University, 2001

M.S. Weed Science, Mississippi State University, 1997

B.S. Agricultural Pest Management summa cum laude, Mississippi State University, 1995

Experience

  • July 2006 – present: Extension Specialist and Associate Professor, Department of Plant Pathology, Physiology, & Weed Science, Virginia Polytechnic Institute and State University, Blacksburg
  • April 2001 – July 2006: Extension Specialist and Assistant Professor, Department of Plant Pathology, Physiology, & Weed Science, Virginia Polytechnic Institute and State University, Blacksburg
  • May 1997 – April 2001Research Assistant, Crop Science Department, North Carolina State University, Raleigh

Selected Major Awards

  • 2013 - Outstanding Young Weed Scientist - Academia, Southern Weed Science Society
  • 2012 - Outstanding Early Career Weed Scientist, Weed Science Society of America
  • 2010 - Allen H. Kates Extension Employee of the Year, Department of Plant Pathology, Physiology, & Weed Science
  • 2008 - Outstanding Researcher Award, Northeastern Weed Science Society
  • 2005 - Certificate of Appreciation for Service as Web Master and Web Site Development, Northeastern Weed Science Society
  • 2002 - Outstanding Ph.D. Graduate Student Award, Weed Science Society of America
  • 1998 - Outstanding M.S. Graduate Student Award, Southern Weed Science Society

Courses Taught

  • PPWS 4984 - Applied Weed Sci. for Turfgrass & Ornamentals (Instructor)
  • PPWS 6004 - Applied Weed Science Technology (Instructor)
  • PPWS 4754 - Weed Science (Guest Lecturer)
  • PPWS 4264 - Pesticide Usage (Guest Lecturer)
  • CSES 3565 - Turf Ecology (Guest Lecturer)
  • CSES 4564 - Integrated Turf Management (Guest Lecturer)
  • AT 0434 - Pest Management (Guest Lecturer)
  • AT 0664 - Golf & Sports Turf Management (Guest Lecturer)
  • HORT 4205 - Public Gardens Management (Guest Lecturer)
  • HORT 5104 - Intro. to Graduate Studies (Guest Lecturer)

Other Teaching and Advising

  • Presented 143 guest lectures in 9 courses offered in 4 departments since 2001
  • Mentored over 30 undergraduate hourly employees, graduated 4 M.S. students and 6 Ph.D. students since 2001
  • Currently advise two M.S. students and two Ph.D. students
  • Dr. Askew has coached Virginia Tech's Graduate Student Weed Team since 2002.  In 2012, Virginia Tech became the first university to win first place at both the Southern and Northeastern Weed Contests in the same year.  Virginia Tech has had several winning teams and individuals in the past decade.

Program Focus

Dr. Askew's primary responsibility is to provide statewide leadership in the development of weed control programs for turfgrass. Emphasis is placed on development of recommendations and other weed control information pertinent to current problems in home lawns, professional turf (golf courses, football fields, etc.) and commercial sod and seed production. Dr. Askew maintains a close working relationship with Virginia Cooperative Extension agents and provides training aids and research to address turfgrass weed problems. A significant amount of his time is spent developing extension publications, troubleshooting, and conversing with agents, professional turfgrass personnel, and sod/seed farmers.

Current Projects

Virginia Tech Weed ID Clinic.  The Weed ID Clinic has been operating since 1985 and has identified over 8,500 plant samples from every county and independent city in the commonwealth.  Dr. Askew has been the coordinator of the weed clinic since 2002.  Over 1000 unique species have been sent to the clinic in the past decade.  A collaborative team of individuals from the Plant Pathology, Physiology, and Weed Science Department and the College of Agriculture are currently working on an electronic submission system to improve tracking of weed samples and speed responses of weed identification and control recommendations.

*Denotes graduate student advised by Askew

Selected Peer-Reviewed Publications

  • Askew, S. D. and BMS McNulty*.  2014.  Methiozolin and cumyluron for preemergence annual bluegrass (Poa annua) control on creeping bentgrass (Agrostis stolonifera) putting greens.  Weed Technol. 28:535-542.
  • Cox*, M. C. and S. D. Askew.  2014.  Metamifop rates, application timings, and broadleaf herbicide admixtures affect smooth crabgrass control in turf.  Weed Technol. 28:617-625.
  • Askew, W. B., J. M. Goatley, Jr., S. D. Askew, K. L. Hensler, and D. R. McKissack.  2013.  A comparison of turfgrasses for cemeteries and other low-input areas.  Int. Turf. Soc. Res. J. 12:245-250.
  • Post*, A. R., D. B. Ricker*, and S. D. Askew.  2013.  Evaluation of potential admixtures to improve postemergence smooth crabgrass (Digitaria ischaemum Schreb. ex Muhl.) control in cool-season turfgrass with mesotrione.  Int. Turf. Soc. Res. J. 12:701-705.
  • Cox*, M. C., T. L. Mittlesteadt*, and S. D. Askew.  2013.  Improving perennial ryegrass overseeding in 'Patriot' bermudagrass using cultural and chemical treatments.  Int. Turf. Soc. Res. J. 12:231-236.
  • Smith*, A. N., J. B. Willis*, and S. D. Askew.  2013.  Absorption and translocation of flazasulfuron applied to shoots and roots of Lolium perenne L.  Int. Turf. Soc. Res. J. 12:685-687.
  • Venner*, K. A., T. L. Mittlesteadt*, and S. D. Askew.  2013.  Improving quality of bermudagrass post-dormancy transition using partial control techniques.  Int. Turf. Soc. Res. J. 12:707-711.
  • Askew, S. D., M.J.R. Goddard*, W.L.B. Askew, J. B. Beam*, and R. J. Keese.  2013.  Effect of trifloxysulfuron sodium rate and sequential treatments on transition of overseeded bermudagrass fairways.  Int. Turf. Soc. Res. J. 12:689-694.
  • Askew, S. D., M. J.R. Goddard*, W. L.B. Askew*, J. B. Beam*, and R. J. Keese. 2013. Effect of trifloxysulfuron sodium rate and sequential treatments on transition of overseeded bermudagrass fairways. Int. Turf. Soc. Res. J. 12:(In Press).
  • Goddard*, M.J.R., J. B. Willis*, and S. D. Askew. 2010. Application placement and relative humidity affects smooth crabgrass and tall fescue response to mesotrione. Weed Sci. 58:67-72.
  • Askew, S. D. and T. R. Murphy. 2009. Relative mobility of transition-assisting herbicides. Int. Turf. Soc. Res. J. 11:1153-1158.
  • Beam*, J. B. and S. D. Askew. 2007. Fate of prohexadione calcium in annual bluegrass (Poa annua) and three turfgrasses. Weed Sci. 55:541-545.
  • Willis*, J. B., S. D. Askew, and J. S. McElroy. 2007. Improved white clover control with mesotrione by tank-mixing bromoxynil, carfentrazone, and simazine. Weed Technol. 21:739-743.
  • Barker*, W. L., J. B. Beam*, and S. D. Askew. 2006. Persistence of rimsulfuron on perennial ryegrass (Lolium perenne) and annual bluegrass (Poa annua) foliage. Weed Technol. 20:345-350.
  • Beam*, J. B., W. L. Barker*, and S. D. Askew. 2006. Selective creeping bentgrass (Agrostis stolonifera) control in cool-season turfgrass. Weed Technol. 20:340-344.
  • McCullough, P. E., S. E. Hart, S. D. Askew, P. H. Dernoeden, Z. Reicher, and D. Weisenberger. 2006. Kentucky bluegrass control with postemergence herbicides. HortScience 41:255-258.
  • Munshaw, G. C., E. H. Ervin, C. Shang, S. D. Askew, X. Zhang, and R. W. Lemus. 2006. Influence of Late-Season Iron, Nitrogen, and Seaweed Extract on Fall Color Retention and Cold Tolerance of Four Bermudagrass Cultivars. Crop Sci. 46:273-283.
  • Willis*, J. B., J. B. Beam*, W. L. Barker*, and S. D. Askew. 2006. Weed control options for spring seeded tall fescue (Festuca arundinacea). Weed Technol. 20:1040-1046.

Selected Industry Publications

  • Reams N.*, E. Ervin, D. McCall*, S. Askew. The influence of iron, sulfur, and pH on dollar spot development. Virginia Turfgrass Journal. Nov/Dec: 22-25.
  • Askew S., K. Venner*. 2014. Effects of fertility on putting green recovery following methiozolin applications. Virginia Turfgrass Journal May/June 2014, Virginia Turfgrass Council, Pp 16-17.
  • Rana S.*, S. Askew. 2014. A new liquid formulation of quinclorac for smooth crabgrass control in cool-season turf. Virginia Turfgrass Journal May/June 2014, Virginia Turfgrass Council, Pp 20-21.
  • Smith A.*, S. Askew, G. Hackman. 2014. Postemergence and residual crabgrass control with Calvacade PQ in cool-season turf. Virginia Turfgrass Journal May/June 2014, Virginia Turgrass Council, P 27.
  • Cox M.*, S. Askew. 2014. Rimsulfuron plus metsulfuron for spring and fall transition of overseeded bermudagrass turf. Virginia Turgrass Journal May/June 2014, Virginia Turfgrass Council, P 28.
  • Cox M.*, S. Askew. 2014. Goosegrass control and bermudagrass response to Pylex. Virginia Turfgrass Journal May/June 2014, Virginia Turfgrass Council, P 29.
  • Reasor, E., M. Goatley, W. Askew, S. D. Askew, and D. McCall. 2012. Influence of fall fertilization programs on the traffic tolerance and recovery of sprigged bermudagrass varieties. Virginia Turfgrass J. May/June 2012. Pp. 12-13.
  • Smith*, A. and S. D. Askew. 2012. Sweet vernalgrass control in cool-season turf. Virginia Turfgrass J. May/June 2012. P. 22.
  • McCall, D. and S. D. Askew. 2011. DMI fungicides and Poa annua seedhead suppression. Golf Course Mgt., 79(8):32.
  • Post*, A. R., S. D. Askew, and D. McCall. 2011. Identifying candidate herbicides for moss control. Virginia Turfgrass J. May/June 2011. Pp. 12-13.
  • Askew, S. D. 2010. Perennial ryegrass competition affects bermudagrass health. Golf Course Management. 78 #10: 96-102.
  • Askew, S. D. 2010. Overseeded bermudagrass: Improving turf aesthetics during spring transition. Golf Course Management. 78#9: 100-104.
  • Askew, S. D. 2010. Annual bluegrass control on golf putting greens via directed herbicide application. Virginia Turfgrass Journal. May/June: 16-17.
  • Willis* J. B and S. D. Askew. 2009. Timing is everything with spring transition. Turfgrass Trends, October 2009.
  • Askew S. D. 2009. Common ragweed, nothing to sneeze about. Washington Gardner Magazine, Sep-Oct 2009, Page 36.
  • Askew S. D. 2008. High-Tech Tools Mow Down Test Turfgrass in Greenhouses, Turfgrass Trends, Jan 2008.
  • Willis* J. B. and S. D. Askew. 2008. Bermudagrass control advances, Turfgrass Trends, March 2008.

Selected Scientific Abstracts

  • Askew, S.D. and S. Koo.  2014.  Long-term evaluation of seasonal methiozolin programs for Poa annua control on golf putting greens.  Proc. South. Weed Sci. Soc. 67:242.
  • Askew, S.D., A. R. Post*, and D. S. McCall.  2014.  The potential for biological control of silvery threadmoss with two fungal pathogens.  Weed Sci. Soc. of Am. Abstracts 55:266.
  • Askew, S.D., K.M. Han, and S.J. Koo.  2014.  A survey of golf courses participating in the methiozolin experimental use permit program.  Proc.Northeast. Weed Sci. Soc. 68:122.
  • Askew, S.D., M.C. Cox*, and A.R. Post*.  Efficacy of several herbicides for deertongue grass (Dichanthelium clandestinum) control.  Proc. South. Weed Sci. Soc. 67:257.
  • Cox*, M.C. and S. Askew.  2014.  Differential response of goosegrass and smooth crabgrass to low rates of topramezone.  Weed Sci. Soc. of Am. Abstracts 55:144.
  • Cox*, M.C., Collakova, E. and S.D. Askew.  2014.  Physiological response of 5 goosegrass populations to oxadiazon. Proc.Northeast. Weed Sci. Soc. 68:23.
  • Cox*, M.C., S. Askew, J. Hope.  2014.   Timings of Specticle Flo for Postemergence annual bluegrass control in bermudagrass.  Proc. South. Weed Sci. Soc. 67:230.
  • Cox*, M.C., S.D. Askew, and D. Loughner.  2014.  Chem-Lawn spray gun versus boom for dithiopyr plus florasulam performance in lawn turf.  Proc.Northeast. Weed Sci. Soc. 68:68.
  • Leon, R.G., D. Shaw, J. Brosnan, S. McElroy, and S. Askew.  2014.  WSSA lesson modules for herbicide resistance management in turfgrass.  Weed Sci. Soc. of Am. Abstracts 55:148.
  • Leon, R.G., D. Shaw, J.T. Brosnan, J.S. McElroy, and S.D. Askew.  2014.  WSSA lesson modules for herbicide resistance management in turfgrass.  Proc. South. Weed Sci. Soc. 67:241.
  • Post*, A., S.D. Askew, and D.S. McCall.  2014.  Preemergent control of silvery threadmoss propagules with herbicides, fungicides, and plant growth regulators.  Proc.Northeast. Weed Sci. Soc. 68:126.
  • Post*, A.R. and S.D. Askew.  2014.  Absorption and translocation of 14c-glyphosate in a silvery threadmoss colony.  Weed Sci. Soc. of Am. Abstracts 55:155.
  • Rana*, S.S., J. Corbett, and S.D. Askew.  2014.   A new liquid formulation of metsulfuron for broadleaf weed control in warm-season turf.  Proc. South. Weed Sci. Soc. 67:137.
  • Rana*, S.S., J. Corbett, and S.D. Askew.  2014.  A new liquid formulation of quinclorac for smooth crabgrass control in cool-season turf. Proc. South. Weed Sci. Soc. 67:91.
  • Rana*, S.S., K.A. Venner*, M.C. Cox*, and S. Askew.  2014.  Bermudagrass control in cool-season turf with topramezone.  Weed Sci. Soc. of Am. Abstracts 55:143.
  • Rana*, S.S., M.C. Cox*, D. Loughner, and S.D. Askew.  2014.  Comparing formulations and timings of dithiopyr plus florasulam for crabgrass and broadleaf weed control in cool-season turf.  Proc.Northeast. Weed Sci. Soc. 68:58.
  • Rana*, S.S., S.D. Askew, J. Borger, T. Harpster, and D. Lycan.  2014.  Mesotrione plus triclopyr formulations for weed control in cool-season turf.  Proc.Northeast. Weed Sci. Soc. 68:29.
  • Rana*, S.S., S.D. Askew, K.A. Venner*, and A.N. Smith*.  2014.  Response of 110 Kentucky bluegrass varieties to methiozolin.  Weed Sci. Soc. of Am. Abstracts 55:254.
  • Smith*, A.N., S. Askew, and S. Hagood.  2014.  Absorption, translocation, and metabolism of glyphosate in nicosulfuron and glyphosate-resistant Sorghum halepense.  Weed Sci. Soc. of Am. Abstracts 55:289.
  • Smith*, A.N., S.D. Askew, and G.S. Hackman.  2014.  Postemergence and residual crabgrass control with Cavalcade PQ in cool-season turf.  Proc.Northeast. Weed Sci. Soc. 68:124.
  • Smith*, A.N., S.D. Askew, and J. Corbett.  2014.  Evaluating Qualipro preemergence liquid formulation herbicides for crabgrass control and selectivity in bermudagrass and perennial ryegrass turf.  Proc.Northeast. Weed Sci. Soc. 68:24.
  • Venner*, K.A., E. Collakova, S. Koo, and S. Askew.  2014.  Investigating the role of tyrosine aminotranferase inhibition on Poa annua response to methiozolin.  Weed Sci. Soc. of Am. Abstracts 55:255.
  • Venner*, K.A., M.C. Cox*, S.D. Askew, and K. Miller.  2014.   Bermudagrass and goosegrass control in creeping bentgrass with topramezone.  Proc. South. Weed Sci. Soc. 67:232.
  • Venner*, K.A., S.D. Askew, and S. Koo.  2014.  Influence of cultural treatments on putting green recovery following methiozolin applications.  Proc. South. Weed Sci. Soc. 67:117.
  • Venner*, K.A., S.D. Askew, and S.J. Koo.  2014.  Interaction of ethephon and methiozolin on creeping bentgrass and annual bluegrass putting greens.  Proc.Northeast. Weed Sci. Soc. 68:50.
  • Venner*, K.A., S.D. Askew, M. Goatley, and W. Askew.  2014  .Evaluation of glyphosate rates on fine fescue cultivars.  Weed Sci. Soc. of Am. Abstracts 55:145.
  • Venner*, K.A., S.D. Askew, M.C. Cox*, and K. Miller.  2014.  Bentgrass response to topramezone.  Proc.Northeast. We
Shawn Askew
  • (540) 231-5807
  • saskew@vt.edu
  • 203 Old Glade Road Research Center
    Mail code: 0331
    Blacksburg, VA 24061