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15 September 2023 Differential susceptibility of Iowa waterhemp (Amaranthus tuberculatus) populations to 2,4-D, dicamba, and glufosinate
Ryan C. Hamberg, Ramawatar Yadav, Micheal D.K. Owen, Mark A. Licht
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Abstract

Multiple herbicide-resistant waterhemp (Amaranthus tuberculatus (Moq.) J.D. Sauer) has limited herbicide options for Iowa row crop production. Soybean (Glycine max (L.) Merr.) cultivars and corn (Zea mays L.) hybrids resistant to 2,4-D, dicamba, and glufosinate have provided more herbicide options for waterhemp management. A probability-based survey of Iowa fields was conducted in fall 2019 wherein waterhemp seeds were collected and their susceptibility to 2,4-D, dicamba, and glufosinate was determined. The average survival of all populations treated with 1× 2,4-D, dicamba, and glufosinate was 17%, 5%, and 4%, respectively. Seven percent of treated populations exhibited ≥50% survival to 1× rates of 2,4-D.

Ryan C. Hamberg, Ramawatar Yadav, Micheal D.K. Owen, and Mark A. Licht "Differential susceptibility of Iowa waterhemp (Amaranthus tuberculatus) populations to 2,4-D, dicamba, and glufosinate," Canadian Journal of Plant Science 103(6), 595-599, (15 September 2023). https://doi.org/10.1139/cjps-2023-0081
Received: 6 June 2023; Accepted: 19 July 2023; Published: 15 September 2023
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KEYWORDS
corn
Herbicide resistance
probability-based survey
soybean
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