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 aeha−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 por ciento were susceptible (0 por ciento survival) to 2,4-D and dicamba, respectively. More than 90 por ciento of the accessions showed high (mayor a 60 por ciento) survival to glyphosate. While none of the accessions showed total sensitivity (0 por ciento survival) to the other herbicides evaluated, 43 por ciento and 72 por ciento of the accessions showed greater than 60 por ciento 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.
Scursoni, J. A.; Tuesca, D.; Balassone, F.; Morello, J.; Medina Herrera, D.; Lescano, M. C.; Montero Bulascio, N.; Crespo, R. J.; Depetris, M. B. & Vila Aiub, M. M. (2022). Response of smooth pigweed (Amaranthus hybridus) accessions from Argentina to herbicides from multiple sites of action. Weed Technology,36, (3),p.384-389
10.1017/wet.2022.9
Scursoni, Julio Alejandro,Tuesca, Daniel,Balassone, Federico,Morello, Juan,Medina Herrera, Daniela,Lescano, María C., et al.. 2022. "Response of smooth pigweed (Amaranthus hybridus) accessions from Argentina to herbicides from multiple sites of action". Weed Technology 36, no.3:384-389.
Recuperado de http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2022scursoni