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Russell Hahn

Russell Hahn

Emeritus

238A Emerson Hall
(607) 255-1759

I joined the Integrated Field Crop and Soil extension team at Cornell in 1974. As an extension specialist, my mission is to evaluate weed management strategies for agronomic crops in NY State, to incorporate the results into management guidelines, and to conduct educational programs on the implementation of these guidelines.

Research Focus

Research focus is on development and support of weed management guidelines for conventional and herbicide-resistant field crops grown in conventional and no/zone-tillage cropping systems. Troublesome annual broadleaf weeds such as common ragweed and common lambsquarters receive special attention along with perennial weeds like dandelion. In addition to routine herbicide testing done in support of the guidelines in the Cornell Guide for Integrated Field Crop Management, effort is devoted to developing strategies to deal with weed population shifts, especially in no-tillage cropping systems, and to delay or prevent development of new herbicide-resistant weed populations in NY State.

Outreach and Extension Focus

Extension programs for integrated weed management in field crops emphasize effective and economical weed management strategies for conventional and herbicide-resistant field crops in both conventional and no-tillage cropping systems. Awareness of problems with herbicide-resistant weeds and herbicide resistance management are key elements of this program. Important activities include the annual update of the weed management sections of the "Cornell Guide for Integrated Field Crop Management" along with numerous workshops, field days, and other training sessions. These sessions provide an opportunity for private and commercial pesticide applicators to receive re-certification credits. Many of these sessions provide continuing education units (CEUs) for crop advisers through the Northeast Region Certified Crop Adviser Program. Contributions to "What's Cropping Up?"- a newsletter for New York field crops and soils, are also part of my outreach effort. Target audiences include extension field staff, dealers, applicators, crop advisers, and field crop producers in New York and New England. In addition, I serve on the College's IPM Operating Committee as Chair of the Livestock/Field Crops IPM Committee.

Awards and Honors

  • Industry Impact Award (2014) New York State Agribusiness Association
  • Outstanding Extension Award (2014) Weed Science Society of America
  • Outstanding Paper in Weed Technology (2013) Weed Science Society of America
  • Research and Extension Award for Outstanding Accomplishments in Extension/Outreach (2013) College of Agriculture and Life Sciences

Selected Publications

Journal Publications

Conference Proceedings

  • Hahn, R. R., Richtmyer , R. J., & Orlowski , J. M. (2014). Dandelion management in zone-tillage glyphosate resistant corn and soybeans. Northeastern Weed Science Society , Northeastern Weed Science Society 114 p.
  • Hahn, R. R., Richtmyer, R. J., & Orlowski, J. M. (2012). Reduced rate residual herbicides prevent dandelion establishment in zone-tillage corn and soybeans. Proceedings Northeastern Weed Science Society . Northeastern Weed Science Society, Northeastern Weed Science Society 106 p.
  • Hahn, R. R., & Stachowski, P. J. (2006). Hedge bindweed control in field corn. Proceedings Northeastern Weed Science Society, Proceedings Northeastern Weed Science Society, USA 81 p.

Newsletters

  • Hahn, R. R. (2014). Glyphosate-resistant weeds likely in NY. p. 8-10 What's Cropping Up? Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853.
  • Hahn, R. R. (2014). Late summer is a good time to control deep-rooted perennial broadleaf weeds. p. 5-6 What's Cropping Up? Department of Crop and Soil Sciences, Cornell University , Ithaca, NY 14853.

Presentations and Activities

  • Dandelion management in zone-tillage glyphosate-resistant corn and soybeans. Northeastern Weed Science Society 68th Annual Meeting . January 2014. Northeastern Weed Science Society . Philadelphia, PA .
  • Reduced rate residual herbicides prevent dandelion establishment in zone-tillage corn and soybeans. Northeastern Weed Science Society 66th Annual Meeting . January 2012. Northeastern Weed Science Society . Philadelphia, PA.