Weed Technology (2022) 36, 384-389

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 (2022)
Response of smooth pigweed (Amaranthus hybridus) accessions from Argentina to herbicides from multiple sites of action
Weed Technology 36 (3), 384-389
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Julio A. Scursoni, Martin M. Vila-Aiub

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Amaranthus hybridus (weed)	Soybean (Glycine max)	Argentina