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9 October 2019 Response of sweetpotato to pendimethalin application rate and timing
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Field trials were conducted near Pontotoc, Mississippi; Chase, Louisiana; and Clinton, North Carolina, in 2017 and 2018 to determine the effect of pendimethalin rate and timing application on sweetpotato crop tolerance, yield, and storage root quality. Treatments consisted of five pendimethalin rates (266, 532, 1,065, 1,597, and 2,130 g ai ha–1) by two application timings (0 to 1 or 10 to 14 d after transplanting). Additionally, a nontreated check was included for comparison. Crop injury (stunting) was minimal (≤4%) through 6 wk after transplanting (WAP) and no injury was observed from 8 to 14 WAP, regardless of application timing or rate. The nontreated check yielded 6.6, 17.6, 5.5, and 32.1 × 103 kg ha–1 of canner, no. 1, jumbo, and total grades, respectively. Neither pendimethalin application timing nor rate influenced jumbo, no. 1, marketable, or total sweetpotato yield. Overall, these results indicate that pendimethalin will be a valuable addition to the toolkit of sweetpotato growers.

Nomenclature: Pendimethalin; sweetpotato, Ipomoea batatas (L.) Lam. ‘Covington’, ‘Beauregard’

© Weed Science Society of America, 2019.
Stephen L. Meyers, Sushila Chaudhari, Katherine M. Jennings, Donnie K. Miller, and Mark W. Shankle "Response of sweetpotato to pendimethalin application rate and timing," Weed Technology 34(2), 301-304, (9 October 2019).
Received: 19 April 2019; Accepted: 2 October 2019; Published: 9 October 2019

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