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Sweet Corn Hybrid Sensitivity to Clopyralid

Published online by Cambridge University Press:  20 January 2017

Nader Soltani ,
Shane Diebold ,
Darren E. Robinson  and
Peter H. Sikkema
Nader Soltani*
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, Ontario, Canada N0P 2C0
Shane Diebold
Affiliation:
Ridgetown College, University of Guelph, Ridgetown, Ontario, Canada N0P 2C0
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph, Ridgetown, Ontario, Canada N0P 2C0
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph, Ridgetown, Ontario, Canada N0P 2C0
*
Corresponding author's E-mail: nsoltani@ridgetownc.uoguelph.ca
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Abstract

Limited information exists on sweet corn tolerance to postemergence (POST) applications of clopyralid under Ontario growing conditions. Eight sweet corn hybrids were evaluated for tolerance to clopyralid in three field experiments conducted in 2001 and 2002 in Ontario. Clopyralid was applied POST at 200 and 400 g ai/ha, the proposed and twice the proposed registered rate for use in sweet corn in Ontario. Sweet corn response to clopyralid did not vary among the hybrids tested. In 2001, visual injury among hybrids 7 d after treatment (DAT) with clopyralid at 400 g/ha was less than 3%. Subsequent visual injury evaluations at 14 and 28 DAT showed no differences among sweet corn hybrids at either rate of clopyralid evaluated. The application of clopyralid at 200 and 400 g/ ha had no detrimental effect on plant height or marketable yield of any of the eight sweet corn hybrids. On the basis of visual injury, height, and marketable yield response ‘Calico Belle’, ‘CNS 710’, ‘DelMonte 2038’, ‘GG 222’, ‘GG 246’, ‘GH 2684’, ‘Reveille’, and ‘Rival’ are all tolerant to the POST application of clopyralid.

Keywords

Clopyralidsweet corn, Zea mays L.Clopyralidherbicide injurysweet cornsensitivitytoleranceDAP, days after plantingDAT, days after treatmentPOST, postemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 342 - 345
Copyright
Copyright © Weed Science Society of America 

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