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Snap Bean (Phaseolus vulgaris) Tolerance to Halosulfuron PRE, POST, or PRE followed by POST

Published online by Cambridge University Press:  20 January 2017

Brandy D. Silvey ,
Wayne E. Mitchem ,
Andrew W. Macrae  and
David W. Monks
Brandy D. Silvey*
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
Wayne E. Mitchem
Affiliation:
Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609
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
*
Corresponding author's E-mail: bdsilvey@ncsu.edu
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Abstract

A field experiment was conducted in 1996 and 1997 to determine snap bean tolerance to halosulfuron based on crop injury, height, and yield. Halosulfuron was applied preemergence (PRE), postemergence (POST), and sequentially PRE followed by (fb) POST at 35, 53, and 70 g ai/ha, respectively. For comparison, a hand-weeded check was included. When data were averaged across years and halosulfuron rates, halosulfuron PRE, POST, and PRE fb POST provided similar yellow nutsedge control (74 to 82%) at snap bean harvest. Halosulfuron PRE resulted in 4% snap bean injury at harvest. Similarly, halosulfuron PRE fb POST resulted in 5% injury, while halosulfuron POST caused the most damage at 8%. Snap bean height at harvest was reduced 14% with halosulfuron POST compared to the weed-free check, with only 5 and 6% reduction caused by halosulfuron PRE and PRE fb POST, respectively. Halosulfuron POST reduced yield 39% compared to the weed-free check, while the PRE and PRE fb POST application timings produced yield similar to the check. When averaged across years and halosulfuron application timings, an increase in halosulfuron rate had no effect on yellow nutsedge control or snap bean yield. A linear trend was found for snap bean injury and plant height at harvest with snap bean injury increasing with an increase in halosulfuron rate while snap bean plant height decreased with an increase in halosulfuron rate. Application of halosulfuron PRE is the safest means to control yellow nutsedge in snap bean in North Carolina.

Keywords

halosulfuronyellow nutsedge, Cyperus esculentus L. #3 CYPESsnap bean, Phaseolus vulgaris L. ‘Strike’crop injuryplant heightyieldfb, followed byPRE, preemergencePOST, postemergenceWAP, wks after planting
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 873 - 876
Copyright
Copyright © Weed Science Society of America 

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