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1 March 2017 Frequency and Dispersal of Glyphosate-Resistant Sourgrass (Digitaria insularis) Populations across Brazilian Agricultural Production Areas
Ramiro F. Lopez Ovejero, Hudson K. Takano, Marcelo Nicolai, Antonio Ferreira, Marcel S. C. Melo, Anderson L. Cavenaghi, Pedro J. Christoffoleti, Rubem S. Oliveira
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Abstract

The rapid spread of glyphosate-resistant sourgrass populations generates concern in the agricultural production sector in Brazil. Nonetheless, there is not much information related to the frequency and dispersion of sourgrass throughout recent years. We investigated the frequency and dispersion of glyphosate-resistant sourgrass populations in Brazilian agricultural regions as part of a larger-scale weed resistance monitoring study. A discriminatory rate of 960 g ae ha−1 of glyphosate was used on plants at the 2- to 3-tiller stage, originating from 2,593 populations of sourgrass sampled in 329 counties in 14 Brazilian states between 2012 and 2015. The dispersion of sourgrass populations originated in western Paraná State, next to the Paraguay border, where the first resistance case was reported. Its dispersion to the central region of Brazil, mainly in soybean-producing areas, is most likely a consequence of agricultural equipment movement and wind-mediated dispersal. Glyphosate-resistant sourgrass populations were found in every geographical region across all Brazilian states tested. These data highlight the importance of an appropriate weed resistance monitoring program to track the evolution and dispersion of resistance to mitigate these issues by focusing efforts regionally and raising awareness among stakeholders in each region.

Nomenclature: glyphosate, sourgrass, Digitaria insularis (L.) Mez ex Ekman, soybean, Glycine max (L.) Merr.

© Weed Science Society of America, 2017 
Ramiro F. Lopez Ovejero, Hudson K. Takano, Marcelo Nicolai, Antonio Ferreira, Marcel S. C. Melo, Anderson L. Cavenaghi, Pedro J. Christoffoleti, and Rubem S. Oliveira "Frequency and Dispersal of Glyphosate-Resistant Sourgrass (Digitaria insularis) Populations across Brazilian Agricultural Production Areas," Weed Science 65(2), 285-294, (1 March 2017). https://doi.org/10.1017/wsc.2016.31
Received: 24 July 2016; Accepted: 1 November 2016; Published: 1 March 2017
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