Demographics of glyphosate-resistant and susceptible Italian ryegrass populations from Paraná

Pagnoncelli, Fortunato De Bortoli; Trezzi, Michelangelo Müzell; Salomão, Helis Marina; Hartmann, Katia Cristina Dalpiva; Pereira, Patrícia Bortolanza; González-Andújar, José L.

doi:10.51694/advweedsci/2021;39:00011

Cited by 1 publication

(1 citation statement)

References 27 publications

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“…The herbicides metsulfuron-methyl and paraquat experienced a growth of nearly 600% in the past decade, which is also related to the use as alternative herbicides to control GRweeds. The use of clethodim grew 2300%, which was the highest increase all the herbicides evaluated, and is related to the occurrence of GR-Lolium multiflorum, GR-Digitaria insularis and GR-Eleusine indica (Pagnoncelli et al, 2021;Leal et al, 2021, Heap, 2022. The expiration of many herbicide active ingredient patents in the early 2000s, followed by the end of the first generation of GR soybean patent in 2016 (Haggblade et al, 2017) also contributed for the greater use of herbicides in Brazil, especially glyphosate.…”

Section: Herbicide-resistant Crops: a New Era In Weed Managementmentioning

confidence: 95%

Herbicide use history and perspective in South America

Merotto¹,

Gazziero²,

Oliveira³

et al. 2022

Advances in Weed Science

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Background: Agriculture in South America (SA) had a great expansion in the last decades and weed control changed accordingly with region and crop practices. Objective: The objective of this review is to present the history of herbicide use and discuss the main changes in weed management in SA. Methods: Herbicide use quantities were obtained from official institutions and commercial organizations in Argentina, Brazil, Chile, Paraguay and Uruguay. Data were summarized per active ingredient, herbicide mode of action or crop. The evolution of the cultivated area of the main crops in each country, and the crop and weed management associated to it were considered to discuss the importance and the consequences of the main herbicides used. Results:In 2019 the most used herbicides in Brazil were glyphosate, 2,4-D, atrazine, paraquat and diuron representing 62, 15, 7, 5 and 2% of the total amount used. In Argentina, the increasing selection of herbicide resistant populations (4 cases/year), resulted in utilization of older chemistries. Weed control in Uruguay is traditionally benefited from crop/pasture rotations but recently is also facing problems of continuous cropping systems. Agriculture in Chile is more diverse, but similar patterns and problems of herbicide use are present. Conclusions: Intensification of agriculture, no-tillage, glyphosate resistant crops, and herbicide resistant weeds were the most important drivers of herbicide use changes in SA. Integrated weed management is unpostponable to provide sustainable increasing food production in SA.

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Section: Herbicide-resistant Crops: a New Era In Weed Managementmentioning

confidence: 95%