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Yield and Physiological Response of Flue-Cured Tobacco to Simulated Glyphosate Drift

Published online by Cambridge University Press:  20 January 2017

Ian C. Burke ,
Walter E. Thomas ,
Wendy A. Pline-Srnić ,
Loren R. Fisher ,
W. David Smith  and
John W. Wilcut
Ian C. Burke
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Walter E. Thomas
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
Wendy A. Pline-Srnić
Affiliation:
Syngenta, Jealotts Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK
Loren R. Fisher
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
W. David Smith
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
Box 7620, Crop Science Department, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Field trials were conducted in 2001 at the Tobacco Research Station near Oxford, NC, and in 2002 at the Lower Coastal Plains Research Station near Kinston, NC, to determine tobacco yield, injury, and shikimic acid accumulation in response to simulated glyphosate drift. Glyphosate was applied to 12- to 13-cm-high tobacco ‘K326’ early postemergence at 0, 9, 18, 35, 70, 140, 280, 560, and 1,120 (1×) g ai/ha. Crop injury was rated 7 and 35 d after treatment (DAT) and shikimic acid accumulation in leaves at 7 DAT, tobacco yield, and leaf grade index (whole-plant index of harvest interval leaf value) were also assessed. Shikimic acid accumulation and injury symptoms increased similarly as glyphosate rate increased. Glyphosate rates of 140 g/ha (0.125 of recommended rate) or higher resulted in significant crop injury, reduced tobacco yield, and decreased leaf grade index. Shikimic acid accumulation at 7 DAT was inversely related to tobacco yield. Shikimic acid accumulation was found to be an effective diagnostic tool to determine glyphosate drift in tobacco; however, in-season data are needed to correlate shikimic acid accumulation with yield loss.

Keywords

Glyphosate; tobacco, Nicotiana tabacum L. ‘K326’Crop injuryherbicide assayshikimateDAT, days after treatment
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 255 - 260
Copyright
Copyright © Weed Science Society of America 

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