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Sweetpotato Tolerance and Palmer Amaranth Control with Metribuzin and Oryzalin

Published online by Cambridge University Press:  14 September 2017

Stephen L. Meyers ,
Katherine M. Jennings  and
David W. Monks
Stephen L. Meyers*
Affiliation:
Graduate Research Assistant, Assistant Professor, and Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695.
Katherine M. Jennings
Affiliation:
Graduate Research Assistant, Assistant Professor, and Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695.
David W. Monks
Affiliation:
Graduate Research Assistant, Assistant Professor, and Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695.
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Field studies were conducted in Clinton, NC in 2007 and 2009 to determine sweetpotato crop response and Palmer amaranth control with metribuzin and oryzalin. Treatments consisted of 140 and 202 g ai ha−1 metribuzin applied immediately after transplanting [0 wk after transplanting (WAP)] or 2 WAP, 560 and 1121 g ha−1 oryzalin 0 WAP, and tank mixes of metribuzin (140 or 202 g ha−1) and oryzalin (560 or 1,121 g ha−1) 0 WAP. At 2 WAP, metribuzin alone applied 0 WAP resulted in greater crop injury (33%) than oryzalin alone (1%), and the tank mix of metribuzin plus oryzalin resulted in greater crop injury (49%) than either herbicide applied alone. Greater crop injury occurred when metribuzin was applied at 202 g ha−1 (54%) than 140 g ha−1 (34%). Levels of injury were similar at 4 WAP (34, 8, and 52% for metribuzin, oryzalin, and the tank mix, respectively). At 4 WAP, injury from metribuzin was greater when it was applied 0 WAP (34%) compared to 2 WAP (18%). By 10 WAP, injury from metribuzin applied at 2 WAP was only 4%. At 4 WAP, Palmer amaranth control was excellent for all treatments and ≥98%. At 10 WAP, control among treatments ranged from 77% to 85%. Palmer amaranth control provided by metribuzin was similar for applications made 0 WAP (78%) and 2 WAP (77%). Oryzalin alone provided similar control (85%) to metribuzin alone 0 WAP, but greater control than the tank mix (77%). Neither metribuzin nor oryzalin rate differed in weed control provided at 10 WAP. Oryzalin 0 WAP and metribuzin 2 WAP provided no. 1 sweetpotato yields equivalent to the hand-weeded check. No. 1 yields of all other treatments were less than the hand-weeded check but greater than the weedy check.

Keywords

MetribuzinoryzalinPalmer amaranth, Amaranthus palmeri S. Wats.sweetpotato, Ipomoea batatas L. Lam. ‘Beauregard’ and ‘Covington’Herbicide toleranceweed control
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 6 , December 2017 , pp. 903 - 907
Copyright
© Weed Science Society of America, 2017 

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Footnotes

a

Current address of first author: Assistant Professor, North Missisisppi Research and Extension Center–Pontotoc Ridge–Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS 38863.

Associate Editor for this paper: Peter J. Dittmar, University of Florida.

References

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