StaffStaff
Jim Shrefler
Area Extension Specialist
Curriculum Vitae
James W. Shrefler
April, 2005
Address: Home: 1219 Dixon Street, Durant, OK 74701
Business: P.O. Box 128, Lane, OK 74555
Telephone: Home (580) 931-0214 Business (580) 889-7343
Email jshrefler-okstate@lane-ag.org
Foreign language: Spanish - Bilingual (reading, writing and speaking)
1995 – present Horticulture Area Extension Specialist, Oklahoma State University.
Hold Adjunct Professor and Graduate Faculty Status.
Major Activities
- Plan and conduct horticulture related educational events for county Extension Educators and producers.
- Initiate and edit monthly newsletters for consumer and commercial horticulture target audiences.
- Instruct growers in the use of recommended weed, insect and disease control measures.
- Develop Internet-based and portable-media-based electronic educational and pest advisory materials for commercial producers.
- Conduct field demonstrations and applied research on production technologies for watermelon, onions, melons, sweet corn etc.
- Conduct applied research on weed control in onions and melons.
- Conduct turf cultivar evaluations and demonstrations.
- Establish USDA-funded research effort to develop weed management technology for sustainable/organic vegetable production.
Major Accomplishments
- Provided leadership for the establishment of a vegetable producer support and education program that integrated the participation of county, state university and USDA-ARS professionals and industry.
- Secure and manage USDA-funded (PMAP) projects for development of IPM systems for cucurbits (P.I./ $93,000), Internet-based IPM information systems (So. Reg. IPM) (P.I./ $33,000) and organic vegetable production technology (Co. P.I./ $196,000).
- Established a statewide cucurbit production educational meeting that has been held annually for 6 years and has been highly acclaimed by national and local producer organizations.
- Provided technical support that enabled the establishment of a commercial onion production and marketing operation.
- Made significant contributions to weed control technology and information availability for Oklahoma vegetable producers. My efforts lead to improved recommendations and contributed to acquisition of new herbicide labels.
1993 - 1995 Research Associate, Crops and Soils Department, Texas A&M University. (Sandoz Agro supported position).
- Conducted research on weed control in forage and agronomic crops.
1989 - 1992 Research Assistant. University of Florida.
- Conducted research on weed management in vegetable, grain and fiber crops.
1988 Private Consultant. - Evaluated rice breeding selections to determine local adaptation.
1987 - 1988 Biologist. Everglades Research and Education Center. University of Florida.
- Conducted research on vegetable insect management.
1982 ‑ 1987 Research Associate. Department of Plant Pathology and Crop Physiology. Louisiana State University.
- Conducted research on weed management in rice.
1979 ‑ 1981 Graduate Assistant. Department of Plant Pathology and Crop Physiology. Louisiana State University.
- Conducted research on weed biology and ecology.
1976 ‑ 1979 Agricultural Technical Advisor (Peace Corps - Dominican Republic).
- Conducted educational and problem solving programs on pepper, onion and tomato production for subsistence farmers.
1976 Field Inspector. The Ohio Seed Improvement Co. Inspected wheat, oat, barley and soybean seed crops for varietal purity, weeds and yield.
1970 - 1976 Landscaper and Produce Farm Hand.
1993 Ph.D. Agronomy/Weed Science major, Vegetable Crops minor. University of Florida. Dissertation topics: Weed competition in lettuce as influenced by phosphorus fertility in organic soils.
1983 M.S. in Plant Pathology (Weed Science curriculum). Louisiana State University.
1976 Bachelor of Science in Agriculture. The Ohio State University.
1976-1979 Peace Corps Volunteer - Assisted small-scale vegetable producers under programmatic supervision of the Dominican Development Foundation.
1998 Conducted in-country assessment of integrated pest management needs
as a member of a multidisciplinary project that studied agricultural development needs of the Harran Plains in the Tigris and Euphrates Rivers floodplains of southern Turkey.
Laboratory instructor: senior/graduate level weed science course at University of Florida. Laboratory instructor: senior plant physiology course at Louisiana State University.
Field production of cut flowers -1
Warm and cool season turf cultivars - 2
Legume cover crops in pecans -1
Short and intermediate day onion cultivars - 4
Onion weed control - 7
Pest management alternatives for watermelon production – 10
Pepper, eggplant, okra and sweetcorn cultivars - 4
PUBLICATIONS
Shrefler, J. 2004. Onion variety selection, sources and quality. Proc. 23th Ann. Hort. Industries Show. Tulsa.
Shrefler, J., S. Upson and S. McClure. 2004. First year experience with hoop-house grown onion transplants. Proc. 23th Ann. Hort. Industries Show. Tulsa.
Shrefler, J. 2004. Onion Variety selection and weed control update. Hydro Vegetable Meeting. Hydro, Oklahoma.
Shrefler, J. 2003. Melon Pest Manager – A pest management decision making aid for cucurbit producers. 2003 Oklahoma Statewide Cucurbit Production and Marketing Meeting. Chickasha.
Shrefler, J.W. 2003. Small Fruit Production in Sustainable Agriculture. Proc. 22th Ann. Hort. Industries Show. Springdale, Arkansas.
Shrefler, J. 2002. Weed Control in Watermelon. Annual Melon Growers Meeting, Kennett MO.
Shrefler, J. 2002. Watermelon Research at the Lane Ag. Center. Annual Melon Growers Meeting, Kennett Missouri.
Shrefler, J. 2002. Onion Research Update. Hydro Vegetable Meeting. Hydro, Oklahoma.
Shrefler, J.W. 2002. Onion Production and Variety Selection. Proc. 21th Ann. Hort. Industries Show. Tulsa.
Shrefler, J.W. and L. Brandenberger. 2002. Sprayer Technology Options and a Review of Calibration. Proc. 21th Ann. Hort. Industries Show. Tulsa.
Shrefler, J.W. 2001. Onion Production for Oklahoma. Proc. 20th Ann. Hort. Industries Show. Springdale, Arkansas.
Shrefler, J.W. 2000. Weed Control in Watermelon. Proc. 19th Ann. Hort. Industries Show. Tulsa.
Shrefler, J.W. 1998. Vegetable Weed Control. Proc. 17th Ann. Okla. Hort. Industries Show. Tulsa.
Shrefler, J.W. 1998. Alternative Weed Control Techniques. Proc. 17th Ann. Okla. Hort. Industries Show. Tulsa.
Shrefler, J. W. 1997. Techniques for a Continuous Produce Supply. Proc. 15th Ann. Okla. Hort. Industries Show. Tulsa.
Shrefler, J. W., B. W. Roberts and W. O’Hern. 1997. Watermelon Weed Control Studies. Proc. 15th Ann. Okla. Hort. Industries Show. Tulsa.
Shrefler, J. W. 1996. Weed Management in Small Fruit. Proc. 14th Ann. Okla. Hort. Industries Show. Tulsa.
Bruton, B, J. Edelson, W. Roberts, V. Russo, M. Taylor, J. Shrefler, C. Webber. 2004. Transplanted onion production guidelines for Oklahoma and Missouri. Lane Res. and Ext. Center, Oklahoma State University and USDA, Agricultural Res. Service cooperative report.
Shrefler, J. 1999 – 2005. Annual updates of Vegetable and Small Fruits weed control sections. OSU Extension Agent’s Handbook. Oklahoma Cooperative Extension Service.
2001 - 2005 Southeast District Ag News and Notes. J. Shrefler edits a monthly multi-discipline newsletter for County Extension Educators in SE Oklahoma.
2002 -2003 Horticulture in Southern Oklahoma. J. Shrefler wrote a monthly Homeowner-oriented horticulture newsletter to provide timely information for distribution through County Extension units.
2003 Vegetable Trial Report. J. Shrefler contributed reports on onion variety trials. MP-164, Dept. of Hort. and Landscape Arch., Okla. State Univ.
2003 Vegetable Weed Control Studies in Oklahoma. J. Shrefler contributed reports on watermelon, honeydew and onion herbicide studies. Okla. State Univ. MP-162
Brandenberger, L., Shrefler, J. and B. W. Roberts. 2002. Weed Control in Vegetables - 2002. OSU Current Report 6008.
2002 Vegetable Weed Control Studies in Oklahoma. J. Shrefler contributed reports on Watermelon Herbicide Studies. Okla. State Univ. MP-162
Bolin, P. and L. Brandenberger, eds. 2002. Cucurbit Integrated Crop Management. OSU Extension Publication E-853. J. Shrefler developed a weed management section.
2002 Vegetable Trial Report. J. Shrefler contributed reports on onion and watermelon variety trials. MP-164, Dept. of Hort. and Landscape Arch., Okla. State Univ.
Shrefler, J. and B. W. Roberts. 2001. Weed Control in Vegetables - 2001. OSU Current Report 6008.
2001 Vegetable Trial Report. J. Shrefler contributed reports on onion variety trials, watermelon disease management, and cantaloupe weed control. HORT 02-1, Dept. of Hort. and Landscape Arch., Okla. State Univ.
2001 Vegetable Weed Control Studies in Oklahoma. J. Shrefler contributed reports on cucurbit herbicide evaluations. Okla. State Univ. MP-162
2000 Vegetable Trial Report. J. Shrefler contributed reports on onion variety trials and watermelon disease management. HORT 01-1, Dept. of Hort. and Landscape Arch., Okla. State Univ.
Pratt, P., B. Stacey, S. Gray-Melaugh, J. Shrefler. Backyard Fruit Production. Slide and CD-ROM based educational program.
Research
Brandenberger, L.P., J.W. Shrefler, C.L. Webber III, R.E. Talbert, M.E. Payton, L.K. Wells and M. McClelland. 2005 Preemergence weed control in direct-seeded watermelon (Citrullus lanatus) Crops. (Weed Technology. Vol. ?). (Accepted for publication).
Brandenberger, L.P., R.E. Talbert, R.P. Wiedenfeld, J.W. Shrefler, C.L. Webber III and M.S. Malik. 2005. Effects of halosulfuron on weed control in commercial honeydew crops. (Weed Technology. Vol. ?). (Accepted for Publication).
Dogramaci, M., J. W. Shrefler and J.V. Edelson. 2004. Management strategies for squash bug (Anasa tristis DeGeer) in watermelon (Citrullus lanatus Thunb.). 2005. J. Econ. Entomol. 97(6) 1999-2005.
Dogramaci, M., W. Lu, B. W. Roberts, J. W. Shrefler, M. Payton, M. J. Taylor, J.A. Duthie, and J.V. Edelson. 2004. Occurrence and abundance of watermelon (Citrullus lanatus) arthropod pests in Oklahoma. Southwestern Entomologist. 29(2) 99-110.
Lu, W., M. Biernacki, W. Roberts, J. Duthie, J. Edelson, J. Shrefler, and M. Taylor. 2003. Characteristics and geographic variation of watermelon (Citrullus lanatus) production in Oklahoma from a statewide survey. Journal of Vegetable Crop Production. 9(1): 33–48.
Shrefler, J., J. Duthie, J. Edelson, W. Roberts, M. Taylor, and M. Dogramaci. 2002.
Foliar Disease Management Alternatives for Watermelon (Citrullus lanatus). Cucurbitaceae 2002. pp 252-258.
Duthie, J.A., Shrefler, J.W., Roberts, B.W., and Edelson, J.V. 1999. Plant density-dependent variation in marketable yield, fruit biomass, and marketable fraction in watermelon. Crop Science 39:406-412.
Duthie, J.A., Roberts, B.W., Edelson, J.V., and Shrefler, J.W. 1999. Plant density-dependent variation in density, frequency, and size of watermelon fruits. Crop Science 39:412-417.
Roberts, W., J.V. Edelson, J. Duthie, J. Shrefler and N. Roe. 1999. Limitations and potential for conservation tillage systems in horticultural crops. Hort. Tech. 9(3): 359-365.
Dusky, J.A., J.W. Shrefler, D.G. Shilling, B.J. Brecke, D.L. Colvin, C.A. Sanchez, and W.M. Stall. 1996. Influence of phosphorus fertility on competition between lettuce and Amaranthus spinosus. Proceedings of the Second International Weed Control Congress. Copenhagen.
Shrefler, J. W., W. M. Stall and J. A. Dusky. 1996. Spiny Amaranth (Amaranthus spinosus L.), a Serious Competitor to Crisphead Lettuce (Lactuca sativa L.). Hort Science 31:347-348.
Shrefler, J. W., J. A. Dusky, D. G. Shilling, B. J. Brecke and C. A. Sanchez. 1994. Effects of Phosphorus Fertility on Competition between Lettuce (Lactuca sativa) and Spiny Amaranth (Amaranthus spinosus). Weed Sci. 42:556-560.
Shrefler, J. W., D. G. Shilling, J. A. Dusky and B. J. Brecke. 1994. Influence of Phosphorus Fertility on Intra- and Inter-specific Interference between Lettuce (Lactuca sativa) and Spiny Amaranth (Amaranthus spinosus). Weed Sci. 42:574-578.
Presentation Abstracts (Professional Audiences)
Roberts, W., J. Edelson, J. Shrefler and M. Taylor. 2004. Long-term changes as affected by poultry litter applications. HortScience 39 (3):655.
Shrefler, J.W. and Webber, C.L. III. 2004. Weed Control Trials in Transplanted Onions in Oklahoma. HortScience 39 (3):661.
Webber, C.L. III. and Shrefler, J.W. 2004. Alternative Weed Control Options for Spring Transplanted Onions. Weed Sci. Soc. Abstr. No. 26 v. 44: p. 7.
Webber, C.L. III. and Shrefler, J.W. 2004. Dry Bean (Phaseolus vulgaris L.) Yield Components: Weed Control and Soil Moisture Interactions. Hort. Sci. 39(3):654.
Roberts, W., B. Bruton, J. Edelson, J. Shrefler and M. Taylor. 2003. Watermelon Stand Establishment and Disease Control. HortScience 38 (6) p. 1278.
Roberts, W., P. Perkins-Veazie, L. Brandenberger, J. Edelson and J. Shrefler. 2003. Oklahoma Watermelon Cultivar Evaluations. HortScience 38(6) p. 1294.
Shrefler, J.W. 2003. Extending Teaching and Demonstration Activities to a Greater Audience with Portable Computer Media. HortScience 38(6) p. 1265.
Webber, C.L. III. and Shrefler, J.W. 2003. Effect of Cover Crop, Tillage, and Weed Competition on Black Bean Yields. Proc. So. Weed Sci. Soc. v. 56
Webber, C.L. III. and Shrefler, J.W. 2003. Weed Competition and Dry Bean Yield Components. Weed Sci. Soc. Amer. Abstr. v. 43: p. 10.
Roberts, W., M. Biernacki, J. Edelson, J. Shrefler, and M. Taylor. 2002. Uniformity in watermelon cultivar trials. HortScience 37(5):752-753.
Roberts, W., B. Bruton, J. Edelson, and J. Shrefler. 2002. Effects of cultural practices on watermelon stand and disease. HortScience 37(5):746-747.
Roberts, W., L. Brandenberger, J. Edelson, and J. Shrefler. 2002. Watermelon cultivar evaluations in Oklahoma. HortScience 37(5): 753.
Shrefler, J.W. and C. L. Webber III. 2002. Effect of preemergence herbicides on early seeded watermelon. HortScience 37.
M. Dogramaci, J.V. Edelson, S. D. Pair and J. W. Shrefler. 2001. Comparison of management strategies for squash bug (Anasa tristis) in watermelon. Proc. Ento. Soc. Amer.
Shrefler, J. W. 2001. Assessment of the Potential for Sweet Onion Production in Southeast Oklahoma. HortScience 36.
Biernacki, M., W. Roberts, J. Shrefler, J, Duthie, J. Edelson and M. Taylor. 2000. Effects of weed density and distance on watermelon growth and development. Proc South. Weed Sci. Soc. 53.
Biernacki, M., W. Roberts, J. Shrefler, J, Duthie, J. Edelson and M. Taylor. 2000. Water use by watermelon and selected weeds. Proc. South. Weed Sci. Soc. Proc. South. Weed Sci. Soc. 53.
Webber, C. L., J. W. Shrefler. 2000. Interaction of planting dates and preemergence herbicides on watermelon stand establishment. Proc. South. Weed Sci. Soc. 53.
Shrefler, J. and A. Sutherland. 2000 Evaluation of Herbicides for Weed Control in Echinacea (Echinacea purpurea) Grown for Medicinal Purposes. Proc. South. Weed Sci. Soc. 53.
Roberts, W., J. E. Motes, J. Edelson, J. Shrefler, M. Biernacki and M. Taylor. 1999. Watermelon germination response to temperature and cultivar. Proceedings of the American Society of Horticultural Sciences, 59th annual meeting, January - February 1999, Memphis, Tenn. HortScience 34:827.
Roberts, W., J. Duthie, J. Edelson, and J. Shrefler. 1998. Foliar and Spatial Requirements for Watermelon. HortScience. 33(3):545.
Duthie, J., J. Shrefler, W. Roberts, and J. Edelson. 1998. Yield Response of Watermelon to Plant Density. HortScience 33(4):598.
Roberts, W., J. A. Duthie, J. V. Edelson, and J. W. Shrefler. 1998. Watermelon Foliage and Yield Relationships. HortScience. 33(4):598.
Shrefler, J., B.W. Roberts, J.V. Edelson, J.A. Duthie and M.J. Taylor. 1998. Assessment of currently available and potential tools for controlling weeds in watermelon. Proc. South. Weed Sci. Soc. 51.
Shrefler, J. W., J.V. Edelson, M. E. Miller, and D. G. Riley. 1997. Grower perceptions of IPM and weed control: results of cucurbit workshops in Texas and Oklahoma. Proc. South. Weed Sci. Soc. 50.
Shrefler, J. W., J. M. Chandler and K. L. Smith. 1995. Relative activities of chloroacetamide herbicides on large crabgrass (Digitaria sanguinalis (L.) Scop.) in a silt loam soil. Proc. South. Weed Sci. Soc. 48.
Shrefler, J. W., K. L. Smith and J. M. Chandler. 1995. Zorial Uses in Cotton to Enable Corn and Sorghum Rotations. Amer. Soc. of Agron. So. Branch Annual Meeting Proc.
Shrefler, J. W., J. M. Chandler and K. L. Smith. 1994. Performance consistency of some chloroacetamide herbicides as affected by rainfall patterns. Proc. South. Weed Sci. Soc. 47:41.
Shrefler, J. W., J. A. Dusky, and D. G. Shilling. 1993. Early Season Competition Between Spiny Amaranth (Amaranthus spinosus) and Lettuce as Influenced by Phosphorus Fertility. Abstr. Weed Sci. Soc. Am. 33.
Dusky, J. A. and J. W. Shrefler. 1992. Spiny Amaranth (Amaranthus spinosus L.) Competition with Lettuce. Proc. South. Weed Sci. Soc. 45:313.
Shrefler, J. W., J. A. Dusky, C. A. Sanchez and D. G. Shilling. 1992. Spiny Amaranth Interference with Lettuce as Influenced by Phosphorus Fertilization. Abstr. Weed Sci. Soc. Am. 32, 68.
Shrefler, J. W., J. A. Dusky, C. A. Sanchez and D. L. Colvin. 1991. Weed Interference in Crisphead Lettuce. Proc. South. Weed Sci. Soc. 44:206.
Dusky, J. A. and J. W. Shrefler. 1990. Comparison of Two Fall Panicum Ecotypes. Proc. South. Weed Sci. Soc. 43:325.
Baker, J. B., J. W. Shrefler and K. P. Shao. 1987. Sphere of Influence of Hemp Sesbania in Rice. 1987. Proc. South. Weed Sci. Soc. 40:304.
Shrefler, J. W., E. C. McGawley, W. J. Blackmon and B.D. Reynolds. 1986. Effects of Hot Water Treatments on Root Knot Nematodes in Tubers of Apios americana. Journal of Nematology 18:632.
Shrefler, J. W., T. R. Harger and P. R. Nester. 1981. Surfactants with Overtop Application of Bentazon and Acifluorfen in Southeast Louisiana Soybeans. Abstr. Weed. Sci. Soc. Am. 20
Harger, T. R., J. W. Shrefler, E. P. Millhollon and J.V. LaFrankie. 1980. Germination of Rottboellia exaltata Under Laboratory and Field Conditions. Proc. South. Weed Sci. Soc. 33:256.
Technical Reports and Book Chapters
Stall, W. M. and J. W. Shrefler. 2001. Weed Management. p.150-155. In: D. N. Maynard (ed.) Watermelons. Characteristics, production and marketing. ASHS Press, Alexandria, Va.
Shrefler, J. W. 1999. Summary of Crop Safety Studies for Halosulfuron use in Cucurbits. Submitted to IR-4 Headquarters Staff.
Roberts, B. W., J. Edelson, J. Duthie, J. Shrefler, J. Ennis, S. Smith, W. O'Hern, N. Roe, G. Cornforth and T. Mathews. 1997. Multi-cropping cattle and watermelon in the southern plains. In: Sustainable Agriculture Research and Education: Southern Region 1997 Annual Report. pp. 53-54. f.
Shrefler, J. W., R. Gallaher and J. Sartain. 1991. Diagnosis of Potassium Deficiency in Soybean. Agronomy Research Report. Agronomy Department, University of Florida, Gainesville.
Shrefler, J. W. 1980. El Uso Actual del Semillero con los Frutos Menores y Verduras en Bani: Practicas y Limitaciones Tecnicas. Submitted to the Dominican Development Foundation following completion of service as a Peace Corps Volunteer.
Certifications and Specialized Training
- Certified Pesticide Applicator (several states) 1989 - 2004.
- Certified Crop Advisor (passed exam and maintained for one year)
- Web site development / accessibility training
Committee Activity
Search and Screen Committee for business and marketing positions of OSU Food and Agricultural Products Research and Technology Center.
Southern Weed Science Society – Horticultural Crops Section Chair in 1999.
Kerr Center For Sustainable Agriculture – Served on the evaluation committees of the 2000 and 2001 Producer Grant Programs.
Southern Region IPM - Chaired 2002 request for proposals review committee.
- American Society of Horticultural Sciences
- Weed Science Society of America
- Southern Weed Science Society
- Chaired horticultural crops section
- Southern Region – American Society of Horticultural Sciences
- Member of team that received an extension publication award
- Oklahoma Vegetable Association
- Received Outstanding Service Award
- Oklahoma Fruit Growers Association
- Oklahoma Association of Extension Agriculture Agents
- Epsilon Sigma Phi