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Yield and Physiological Response of Peanut to Glyphosate Drift

Published online by Cambridge University Press:  20 January 2017

Bridget R. Lassiter*
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
Ian C. Burke
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
Walter E. Thomas
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
Wendy A. Pline-Srnić
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
David L. Jordan
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
Gail G. Wilkerson
Affiliation:
North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: bridget_lassiter@ncsu.edu

Abstract

Five experiments were conducted during 2001 and 2002 in North Carolina to evaluate peanut injury and pod yield when glyphosate was applied to 10 to 15 cm diameter peanut plants at rates ranging from 9 to 1,120 g ai/ha. Shikimic acid accumulation was determined in three of the five experiments. Visual foliar injury (necrosis and chlorosis) was noted 7 d after treatment (DAT) when glyphosate was applied at 18 g/ha or higher. Glyphosate at 280 g/ha or higher significantly injured the peanut plant and reduced pod yield. Shikimic acid accumulation was negatively correlated with visual injury and pod yield. The presence of shikimic acid can be detected using a leaf tissue assay, which is an effective diagnostic tool for determining exposure of peanut to glyphosate 7 DAT.

Information

Type
Research
Copyright
Copyright © Weed Science Society of America 

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