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4 October 2021 ‘Atlantic’ and ‘Dakota Pearl’ chipping potato responses to glyphosate and dicamba simulated drift
Matthew J. Brooke, John Stenger, Andrej W. Svyantek, Collin Auwarter, Harlene Hatterman-Valenti
Author Affiliations +
Abstract

Field trials were conducted to determine the effects of glyphosate and/or dicamba simulated drift rates on chipping potatoes (Solanum tuberosum L.) ‘Atlantic’ and ‘Dakota Pearl.’ Sublethal herbicide rates were applied at the tuber initiation stage and consisted of dicamba at 99 g ae ha–1 or glyphosate at 197 g ae ha–1 applied alone or the combinations of dicamba at 20 or 99 g ae ha–1 and glyphosate at 40 or 197 g ae ha–1, respectively. At 7 days after treatment (DAT), the high spray combination of glyphosate plus dicamba resulted in the greatest plant damage (28%). Plant injury from plants treated with the low combination of glyphosate plus dicamba did not differ from the nontreated control. At 21 DAT, visible injury increased to 40% for plants treated with the high combination of glyphosate plus dicamba. Total yield suggested that dicamba and glyphosate caused similar yield reductions as plants that received glyphosate at 197 g ha–1 or dicamba at 99 g ha–1 had lower total yields compared to the nontreated and plants that received the combination of glyphosate (197 g ha–1) and dicamba (99 g ha–1) had lower total yields compared to plants that received either herbicide alone. However, ‘Dakota Pearl’ plants were more sensitive to glyphosate at 197 g ha–1 than were ‘Atlantic’ plants, causing the interaction for most tuber grades. Tuber specific gravity was lower for plants that received glyphosate at 197 g ha–1, dicamba at 99 g ha–1, or this combination, but this reduction would not prevent chip processing. Results reinforce the need for diligence when applying these herbicides in proximity to a susceptible crop, such as chipping potatoes, and the need to thoroughly clean sprayers before application to a sensitive crop.

Nomenclature: Dicamba; glyphosate; potato; Solanum tuberosum L. ‘Atlantic;’ ‘Dakota Pearl’

© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America.
Matthew J. Brooke, John Stenger, Andrej W. Svyantek, Collin Auwarter, and Harlene Hatterman-Valenti "‘Atlantic’ and ‘Dakota Pearl’ chipping potato responses to glyphosate and dicamba simulated drift," Weed Technology 36(1), 15-20, (4 October 2021). https://doi.org/10.1017/wet.2021.83
Received: 14 February 2021; Accepted: 21 September 2021; Published: 4 October 2021
KEYWORDS
herbicide injury
lower specific gravity
reduced yield
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