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Response of Sweetpotato to Oryzalin Application Rate and Timing

Published online by Cambridge University Press:  21 December 2018

Sushila Chaudhari ,
Katherine M. Jennings  and
Stephen L. Meyers
Sushila Chaudhari*
Affiliation:
Postdoctoral Research Scholar, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC, USA
Katherine M. Jennings
Affiliation:
Associate Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC, USA
Stephen L. Meyers
Affiliation:
Assistant Extension/Research Professor, North Mississippi Research and Extension Center, Pontotoc Ridge–Flatwoods Branch Experiment Station,Mississippi State University, Pontotoc, MS, USA
*
*Author for correspondence: Sushila Chaudhari, Department of Crop and Soil Sciences, William Hall, 101 Derieux Place, North Carolina State University, Raleigh, NC, 27695. (E-mail: [email protected])
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Abstract

The investigation of potential herbicides for weed control in sweetpotato is critical due to the limited number of registered herbicides and the development of populations of herbicide- resistant weeds. Therefore, field studies were conducted at the Horticultural Crops Research Station, Clinton, NC and the Pontotoc Ridge–Flatwoods Branch Experiment Station, Pontotoc, MS to determine the effect of oryzalin application rate and timing on sweetpotato tolerance. Oryzalin at 0.6, 1.1, 2.2, 3.4, and 4.5 kg ai ha–1 was applied immediately after transplanting or 14 d after sweetpotato transplanting (DAP). At Clinton, oryzalin applied immediately after transplanting resulted in ≤1% leaf distortion 4 and 6 wk after transplanting (WAP) regardless of application rate. However, when oryzalin was applied 14 DAP, greater sweetpotato leaf distortion was observed from 2.2, 3.4, and 4.5 kg ha–1 (≤8%) than 0.6 and 1.1 kg ha–1 (≤4%). At Pontotoc, oryzalin applied immediately after transplanting resulted in ≤6% leaf distortion 4 WAP regardless of application rate. However, when oryzalin was applied at 14 DAP, greater leaf distortion was reported from 3.4 and 4.5 kg ha–1 (11 to 13%) than 0.6, 1.1, and 2.2 kg ha–1 (4 to 6%). Oryzalin application rate and timing did not affect yield of no.1, jumbo, or marketable sweetpotato. Based on these results, oryzalin herbicide has potential for registration in sweetpotato.

Keywords

Peter J. Dittmar, University of FloridaOryzalinsweetpotatoIpomoea batatas (L.) Lam. ‘Covington,’ ‘Beauregard’Crop injurycrop tolerancestorage root
Type
Research Article
Information
Weed Technology , Volume 32 , Issue 6 , December 2018 , pp. 722 - 725
Copyright
© Weed Science Society of America, 2018. 

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