Weed Technology
Published by: Weed Science Society of America
Weed Technology 20(4):873-876. 2006
doi: 10.1614/WT-05-046.1
Snap Bean (Phaseolus vulgaris) Tolerance to Halosulfuron PRE, POST, or PRE followed by POST1




2Graduate Research Assistant, Extension Associate, Graduate Research Assistant, and Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609. Corresponding author's bdsilvey@ncsu.edu
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.
Nomenclature: halosulfuron; yellow nutsedge, Cyperus esculentus L. #3 CYPES; snap bean, Phaseolus vulgaris L. ‘Strike’.
Additional index words: crop injury, plant height, yield.
Abbreviations: fb, followed by; PRE, preemergence; POST, postemergence; WAP, wks after planting.
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Letters followed by this symbol are a WSSA-approved computer code from Composite List of Weeds, Revised 1989. Available only on computer disk from WSSA, 810 East 10th Street, Lawrence, KS 66044.
Induce, a mixture of alkyl aryl polyoxylkane ethers, free fatty acids, and dimethyl polysiloxane. Helena Chemical Company, 225 Schilling Boulevard, Suite 300, Collierville, TN 38017.
Spraying Systems Co., P.O. Box 7900, Wheaton, IL 61089–7900.

The effect of halosulfuron application timing on yellow nutsedge (CYPES) control, snap bean injury and plant height at harvest, and yield, averaged over halosulfuron rate and years