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Emeritus/Retired Faculty

Department of Plant Sciences

David W. Koch, Ph.D.

David W. Koch

Emeritus Professor, Retired
Department fo Plant Sciences


Degrees Earned

1964 - B.S. Ag Education
1966 - M.S. Agronomy, Kansas State University
1971 - Ph.D. Agronomy, Colorado State University


Forage management and utilization for profitable and sustainable livestock production; cooperator-based forage demonstrations throughout state; integration of biological nematode control for sustainable sugar beet production

Research/Educational Experience

As Research (30%) and Extension (70%) Agronomist, work has related to forages for profitable and sustainable livestock production - reducing winter feed cost through use of alternative forages, fall grazing, conservation tillage seeding methods; integrated management of perennial weeds through competition with perennial forages; biological control of sugar beet nematode. Forage resources for winter grazing; improved forage establishment methods; forage competition for long-term weed control; trap crop use in sugar beet rotations

Research Accomplishments

  • Grants and gifts totaling $1.8 million
  • Project Director of 14 major competitive grants (USDA Special Grants, Small Farm, IPM, Pesticide Impact and LISA/SARE Programs) in areas of alternative establishment, forage-perennial weed competition, integrated control of leafy spurge, reduced pesticide use, soil conservation and winter forages
  • Principal Investigator of seven other major competitive grants (DOE and USDA-IPM Programs) in area of forage competition for long-term weed control
  • Principal Investigator of two state grants (Wyoming Department of Agriculture) in area of grass species adaptation and reclamation potential
  • Publications and Presentations
    • 36 refereed journal and 33 Experiment Station research publications
    • 19 international, 40 national and 66 regional professional meeting abstracts and proceedings

Professional Memberships

  • NE-114, Forage-livestock systems for land with soil and site limitations
  • Chairman, Technical Committee for revision, 1983
  • NEC 8, Forage physiology and management, Secretary, 1972-76
  • WRCC-67, National sustainable agricultural research and education in the Western region, 1993-95
  • WRCC-091, Improving stress resistance of forages in the Western United States, 1997-2002

Extension Accomplishments (last 14 years)

  • Authored 31 extension publications.
  • Presentations at 169 farmer, industry and organizational meetings and workshops.
  • Authored or provided information for numerous magazine articles, newsletters and news releases for state and region; participated in 31 field days; developed numerous radio programs.
  • Since 1985, conducted 109 on-farm educational demonstrations on no-till seedings, alternative forages, new varieties, fertilization, pest control, fall grazing and other improved practices with 87 cooperating producers in all 23 Wyoming counties. Currently manage demonstration projects with 32 cooperating farmers and ranchers.
  • Awarded 8 competitive grants with extension education focus (project director of 6) in area of crop rotations, alternatives to pesticides, conservation tillage, and extending the grazing season.

Recent Publications (from total of 127)

  • Koch, D.W. in press. Phosphorus fertilization of garrison creeping foxtail. Wyoming Agric. Ext. Sta. Bul.
  • Jennings, J.W., L.J. Held, D.W. Koch and F.A. Gray. 1999. Trap crop radish: An economical option for controlling nematodes in Wyoming sugar beets. Wyoming Agric. Exp. Sta. Reflections 9(1):23-25.
  • Koch, D.W., F.A. Gray, L. Yun, J.R. Gill, and M. Schwope. 1999. Trap-crop radish use: A biological control for the sugarbeet nematode in sugarbeet-malt barley rotations of the Big Horn Basin. Wyo. Agric. Exp. Sta. Bul. B-1068.
  • Gray, F.A. and D.W. Koch. 1999. Biology and control of Verticillium wilt in alfalfa. Wyoming Agric. Expt. Sta. Bul. 1022R.
  • Koch, D.W., F.A. Gray, and J.R. Gill. 1999. Steps to successful trap crop use in the Big Horn Basin. Wyoming Coop. Ext. Serv. Bul. 1070.
  • Koch, D.W., F.A. Gray and J.R. Gill. 1999. Trap crops: Promising alternatives for sugar beet nematode control. Wyoming Coop. Ext. Serv. Bul. B-1029R.
  • Whitson, T.D. and D.W. Koch. 1998. Control of downy brome (Bromus tectorum) with herbicides and perennial grass competition. Weed Technology 12:391-396.
  • Koch, D.W. and R.H. Delaney. 1998. Role of forages in sustainable agriculture. Wyoming Agric. Exp. Sta. Reflections 8:7-11.
  • Gray, F.A., D.W. Koch and J.M. Krall. 1998. Comparative field reaction of sugarbeet and several cruciferous crops to Nacobbus aberrans. Nematropica 27(2):221-227.
  • Shigaki, T., F.A. Gray, R.H. Delaney and D.W. Koch. 1998. Evaluation of host resistance and intercropping for management of the northern root-knot nematode in sainfoin, Onobrychis viciifolia. J. Sustainable Agric. 12:23-39.
  • Koch, D.W. and A. Karakaya. 1998. Extending the grazing season with turnips and other brassicas. Wyoming Coop. Ext. Serv. Bul. B-1051.
  • Ferrell, M.A., T.D. Whitson, D.W. Koch and A.E. Gade. 1998. Leafy spurge (Euphorbia esula) control with several grass species. Weed Tech. 12:374-380.
  • Gray, F.A. and D.W. Koch. 1998. Guide for selecting alfalfa varieties with disease resistance for Wyoming. Wyoming Agric. Exp. Sta. Bul. B-919R.
  • Koch, D.W. and F.A. Gray. 1997. Nematode-resistant oil radish for Heterodera schachtii control. I. Sugarbeeet-malting barley rotations. J. Sugar Beet Research 34:31-443.
  • Koch, D.W., S.D. Aagard, and R.M. Kettle. 1997. Making the most of winter forage resources. Wyoming Agric. Exp. Sta. Reflections 7:27-31.
  • Krall, J.M., D.W. Koch, F.A. Gray and L.M. Yun. 1996. Potential of sugar beet nematode-resistant radishes and mustard for use in sugar beet rotations. Pp. 619-622. In J. Janick (ed.). Progress in New Crops. Amer. Soc. Hort. Sci. Press, Alexandria, VA.
  • Karakaya, A., F.A. Gray and D.W. Koch. 1996. Host range and pathogenicity of Phytophthora isolated from kale, tyfon, and alfalfa. J. Turk. Phytopath. 24(3):145-148.
  • Koch, D.W. 1995. Forage research and demonstrations, 1991-93. Wyo. Coop. Ext. Serv. MP-84, 92 pp.
  • Koch, D.W. 1993. No-till seeding of alfalfa - one way to reduce cost of winter feed. Wyo. Agric. Exp. Sta. Reflections 2:23-25.
  • Koch, D.W. 1993. Seeding alfalfa without tillage. XVII Inter. Grassl. Congr., Palmerston North, NZ, Pp. 781-784.
  • Rule, D.C., D.W. Koch, R.R. Jones and C.J. Kercher. 1992. Brassica and sugar beet forages for lambs - growth performance of lambs and composition of forage and dock-fat fatty acid. J. Prod. Agric. 3:372-376.
  • Koch, D.W. 1991. Introducing alfalfa into meadows without tillage. In Proc. of the Third Intermountain Meadow Symp., Pp. 57-68. Colo. and Wyo. Agric. Exp. Sta. Tech. Bul. LTB 91-2.
  • Koch, D.W. 1990. Growing brassicas for pasture. Wyo. Coop. Ext. Serv. Bul. B856R.
  • Koch, D.W. and F. Hruby. 1990. Production and quality of forage grasses under dryland conditions. Wyo. Agr. Exp. Sta. Bul. MP-62, Pp. 253-255.
  • Koch, D.W., R. Yeager, D. Reynolds, and N.R. Adam. 1989. Evaluation with heifers of introduced grasses in relation to native range. Wyo. Agr. Exp. Sta. Bul. MP-62, Pp. 192-196.
  • Koch, D.W. 1989. Alternative forages for fall grazing. Wyo. Agr. Exp. Sta. Bul. MP-62, Pp. 197-191.
  • Koch, D.W., T.D. Whitson, M.A. Ferrell and N.R. Adam. 1989. Forage quality of dryland grasses in late summer. Wyo. Agr. Exp. Sta. Bul. MP-62, Pp.197-98.
  • Koch, D.W., C. Kercher, D. Agee, and R. Jones. 1989. Production and use of high-quality, cold-hardy forages. XVI Inter. Grassl. Congr., Nice, France, Pp. 1127-1128.
  • Koch, D.W. 1988. Production and use of sudangrass, sorghum-sudangrass hybrids and millets for forage. Wyo. Coop. Ext. Serv. Bul. B-904.
  • Koch, D.W. and F.A. Gray. 1988. Fall grazing in relation to Verticillium wilt and subsequent yields of alfalfa. Wyo. Agr. Exp. Sta. Bul. MP-55, Pp 244-245.
  • Koch, D.W. 1987. Meadow fertilization - stretching the fertilizer dollar. Wyo. Coop. Ext Serv. Bul. 894.
  • Gholson, L. and D.W. Koch. 1987. Using preservatives for alfalfa hay production in Wyoming. Wyo. Coop. Ext. Bul. 890. Integrated Pest Management Series No. 6.
  • Koch, D.W. (ed.) 1986. Profitable alfalfa production. Chap. 1. Alfalfa cultural practices, Pp. 1-6. Wyo. Coop Ext. Bul. 867.

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