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16 November 2018 Response of Sweetpotato Cultivars to Linuron Rate and Application Time
Shawn C. Beam, Katherine M. Jennings, Sushila Chaudhari, David W. Monks, Jonathan R. Schultheis, Mathew Waldschmidt
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Abstract

Field studies were conducted in 2015 and 2016 in North Carolina to determine the response of ‘Covington’ and ‘Murasaki-29’ sweetpotato cultivars to four rates of linuron (420, 560, 840, and 1,120 g ai ha-1) alone or with S-metolachlor (803 g ai ha-1) applied 7 or 14 d after transplanting (DAP). Injury (chlorosis/necrosis and stunting) to both cultivars was greater when linuron was applied with S-metolachlor as compared to linuron applied alone. Herbicide application at 14 DAP caused greater injury (chlorosis/necrosis and stunting) to both cultivars than when applied at 7 DAP. At 4 wk after treatment (WAT), stunting of Covington and Murasaki-29 (hereafter Murasaki) from linuron at 420 to 1,120 g ha-1 increased from 27% to 50% and 25% to 53%, respectively. At 7 or 8 WAT, crop stunting of 8% or less and 0% was observed in Covington and Murasaki, respectively, regardless of application rate and timing. Murasaki root yields were similar in the linuron alone or with S-metolachlor treatments, and were lower than the nontreated check. In 2016, no. 1 and marketable sweetpotato yields of Covington were similar for the nontreated check, linuron alone, or linuron plus S-metolachlor treatments, but not in 2015. Decreases in no. 1 and marketable root yields were observed when herbicides were applied 14 DAP compared to 7 DAP for Covington in 2015 and for Murasaki in both years. No. 1 and marketable yields of Covington were similar for 420 to 1,120 g ha-1 linuron and nontreated check except marketable root yields in 2015. No. 1 and marketable sweetpotato yields of Murasaki decreased as application rates increased.

Nomenclature: Linuron; S-metolachlor; sweetpotato, Ipomoea batatas (L.) Lam. ‘Covington’, ‘Murasaki’

©Weed Science Society of America, 2018.
Shawn C. Beam, Katherine M. Jennings, Sushila Chaudhari, David W. Monks, Jonathan R. Schultheis, and Mathew Waldschmidt "Response of Sweetpotato Cultivars to Linuron Rate and Application Time," Weed Technology 32(6), 665-670, (16 November 2018). https://doi.org/10.1017/wet.2018.68
Received: 8 May 2018; Accepted: 19 July 2018; Published: 16 November 2018
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KEYWORDS
Crop injury
crop tolerance
storage root
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