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C.O.R.N Newsletter 2008-40
     December 1, 2008 - December 16, 2008


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Have Triple and Quad Stacks Become the New “Conventional” Hybrids?
by Peter Thomison, Rich Minyo, Allen Geyer

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“Traited” hybrids (i.e hybrids with transgenic traits for Bt insect resistance and herbicide tolerance) now dominate the Ohio Corn Performance Test (OCPT) and more than 71% of the entries are triple or quad stacks (contain three or four transgenic traits). In the 2002 test, less than 15% of the hybrid entries were traited. In 2007, over 80% of the entries were traited. This year over 92% of the entries were traited. Of these traited hybrids, 172 hybrids are triple or quad stacks, 27 are double stacks, 23 contain a single trait. This trend in the Ohio Corn Performance Test reflects the increasing adoption of transgenic hybrids by farmers in Ohio. As recently as 2005, less than 20% of corn acreage in the state was planted to transgenic corn hybrids. However, this year the USDA-Economic Research Service (http://www.ers.usda.gov/data/biotechcrops/ ) estimates that two thirds of the state’s corn acreage was planted to transgenic corn hybrids (37% of total acreage planted to stacked trait hybrids, 17% to herbicide tolerant hybrids, and 12% to some type of Bt hybrid). Many corn agronomists in the past used the term “conventional” to characterize hybrids without transgenic traits (non-GMO). However, if conventional also implies commonly grown corn hybrids, it’s no longer applicable to non-transgenic hybrids.

In the OCPT summary of hybrids evaluated in western Ohio (five test sites), seven of the top ten yielding hybrids are triple or quad stacks and one contains a single trait (Bt corn borer resistance). However, non-transgenic hybrids with high yield potential are available and two of the top ten hybrids are non-transgenic. Stacked traits don’t ensure high yields. Of the bottom ten hybrids, eight are triple stacks.

2008 Ohio Corn Performance Test results are now available online at:
http://www.oardc.ohio-state.edu/corntrials/.

Readers can subscribe electronically to this newsletter by signing up at http://agcrops.osu.edu/services/email.html. E-mail labarge.1@osu.edu if you have problems subscribing or no longer wish to receive this newsletter.

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.


Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868

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