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Sweetpotato Tolerance to Halosulfuron Applied Postemergence

Published online by Cambridge University Press:  20 January 2017

Andrew W. MacRae ,
David W. Monks ,
Roger B. Batts ,
Allan C. Thorton  and
Jonathan R. Schultheis
Andrew W. MacRae*
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
David W. Monks
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Roger B. Batts
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Allan C. Thorton
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Jonathan R. Schultheis
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
*
Corresponding author's E-mail: [email protected].
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Abstract

Studies were conducted in 2003 and 2004 to determine the effect of application timing and halosulfuron rate on sweetpotato yield and quality. Halosulfuron was applied 1, 2, and 4 wks after transplanting (WAP) sweetpotato in 2003, and 2, 3, and 4 WAP in 2004. Treatments within each timing included halosulfuron at 13, 26, 39, 52, and 65 g ai/ha plus a weed-free control. Combined over year, site, cultivar and rate, halosulfuron applied at 1, 2, 3, and 4 WAP stunted sweetpotato 32, 15, 11, and 14%, respectively, rated 2 wks after treatment. The stunting observed with the 1 and 2 WAP timings caused a 17 and 10% reduction in yield of No. 1 roots, respectively, compared with the weed-free control. The 3 and 4 WAP timings of halosulfuron did not reduce yield of No. 1 roots. Total yield was reduced approximately 11% at the 1, 2, and 3 WAP application timings. Halosulfuron at 4 WAP did not reduce total yield. Combined over year, site, and cultivar, halosulfuron applied at 39 g/ha did not reduce the weight of No. 1 roots or total crop yield and thus could be an effective POST option for weed control in sweetpotato.

Keywords

Halosulfuronsweetpotato, Ipomoea batatas (L.) LamTimingrateyieldinjury
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 993 - 996
Copyright
Copyright © Weed Science Society of America 

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