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21 March 2022 Response of smooth pigweed (Amaranthus hybridus) accessions from Argentina to herbicides from multiple sites of action
Julio A. Scursoni, Daniel Tuesca, Federico Balassone, Juan P. Morello, Daniela Medina Herrera, María C. Lescano, Nicolás Montero Bulacio, Roberto J. Crespo, Mara B. Depetris, Martin M. Vila-Aiub
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Abstract

Smooth pigweed is one of the most troublesome weeds in Argentina. The objective of this study was to evaluate the sensitivity of 50 smooth pigweed accessions to fomesafen, topramezone, glyphosate, 2,4-D, and dicamba. Accessions were collected from soybean fields in various cropping areas in Argentina. The herbicide treatments included 2,4-D (1,140 g ae ha–1), dicamba (560 g ae ha–1), fomesafen (250 g ai ha–1), topramezone (34 g ai ha–1), and glyphosate (1,080 g ae ha–1). Plant survival was evaluated 30 d after each treatment application. Of the smooth pigweed accessions tested, 84% and 76% were susceptible (0% survival) to 2,4-D and dicamba, respectively. More than 90% of the accessions showed high (>60%) survival to glyphosate. While none of the accessions showed total sensitivity (0% survival) to the other herbicides evaluated, 43% and 72% of the accessions showed greater than 60% survival to fomesafen and topramezone, respectively. The differences in survival among accessions confirm the existence of genetic variability in Argentinian smooth pigweed and suggest that weed management practices should be prioritized to preserve the efficacy of these commonly used herbicides.

Nomenclature: 2,4-D; dicamba; fomesafen; glyphosate; topramezone; smooth pigweed; Amaranthus hybridus L.

© The Author(s), 2022. Published by Cambridge University Press on behalf of the Weed Science Society of America.
Julio A. Scursoni, Daniel Tuesca, Federico Balassone, Juan P. Morello, Daniela Medina Herrera, María C. Lescano, Nicolás Montero Bulacio, Roberto J. Crespo, Mara B. Depetris, and Martin M. Vila-Aiub "Response of smooth pigweed (Amaranthus hybridus) accessions from Argentina to herbicides from multiple sites of action," Weed Technology 36(3), 384-389, (21 March 2022). https://doi.org/10.1017/wet.2022.9
Received: 15 September 2021; Accepted: 27 January 2022; Published: 21 March 2022
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KEYWORDS
Auxin herbicides
fomesafen
Glyphosate
topramezone
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