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Glyphosate-resistant Corn Interference in Glyphosate-resistant Cotton

Published online by Cambridge University Press:  20 January 2017

Walter E. Thomas ,
Wesley J. Everman ,
Scott B. Clewis  and
John W. Wilcut
Walter E. Thomas
Affiliation:
North Carolina State University, Box 7620 Raleigh, NC 27695-7620
Wesley J. Everman
Affiliation:
North Carolina State University, Box 7620 Raleigh, NC 27695-7620
Scott B. Clewis
Affiliation:
North Carolina State University, Box 7620 Raleigh, NC 27695-7620
John W. Wilcut*
Affiliation:
North Carolina State University, Box 7620 Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected]
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Abstract

Studies were conducted at three locations in North Carolina in 2004 to evaluate density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield. GR corn was taller than GR cotton as early as 25 d after planting, depending on location. A GR corn density of 5.25 plant/m of crop row reduced late season cotton height by 49, 24, and 28% at Clayton, Lewiston–Woodville, and Rocky Mount, respectively, compared to weed-free cotton height. At Clayton, GR corn dry biomass per m crop row and GR corn seed biomass per m of crop row decreased linearly with increasing corn density. The relationship between GR corn and GR cotton yield loss was described by the rectangular hyperbola model with the asymptote (a) constrained to 100% maximum yield loss. The estimated coefficient i (yield loss per unit density as density approaches zero) was 9, 5, and 5 at Clayton, Lewiston–Woodville, and Rocky Mount, respectively. The examined GR corn densities had a significant effect on cotton yield, but not as significant as many other problematic grass and broadleaf weeds.

Keywords

Glyphosatecorn, Zea mays L., ZEAMX, ‘DKC 69-71RR’cotton, Gossypium hirsutum L. ‘FM 989RR’, ‘ST 4892RR’Competitioneconomic thresholdmodelsweed biomassweed densityplant height
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 372 - 377
Copyright
Copyright © Weed Science Society of America 

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