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Dispersal and Frequency of Glyphosate-Resistant and Glyphosate-Tolerant Weeds in Soybean-producing Edaphoclimatic Microregions in Brazil

Published online by Cambridge University Press:  30 January 2019

Felipe Ridolfo Lucio ,
Augusto Kalsing ,
Fernando Storniolo Adegas ,
Caio Vitagliano Santi Rossi ,
Núbia Maria Correia ,
Dionisio Luiz Pisa Gazziero  and
Alexandre Ferreira da Silva
Felipe Ridolfo Lucio*
Affiliation:
Research Scientist, Corteva Agriscience Agriculture Division of DowDuPont, São Paulo, Brazil
Augusto Kalsing
Affiliation:
Research Scientist, Corteva Agriscience Agriculture Division of DowDuPont, São Paulo, Brazil
Fernando Storniolo Adegas
Affiliation:
Researcher, Brazilian Agricultural Research Corporation, Embrapa Soybean, Brazil
Caio Vitagliano Santi Rossi
Affiliation:
Research Scientist, Corteva Agriscience Agriculture Division of DowDuPont, São Paulo, Brazil
Núbia Maria Correia
Affiliation:
Researcher, Brazilian Agricultural Research Corporation, Embrapa, Cerrado, Brasilia, Brazil
Dionisio Luiz Pisa Gazziero
Affiliation:
Researcher, Brazilian Agricultural Research Corporation, Embrapa Soybean, Brazil
Alexandre Ferreira da Silva
Affiliation:
Researcher, Brazilian Agricultural Research Corporation, Embrapa Maize and Sorghum, Sete Lagoas, Brazil
*
Author for correspondence: Felipe Ridolfo Lucio, Corteva Agriscience Agriculture Division of DowDuPont, São Paulo 14027-025, Brazil. (Email: frlucio@dow.com)
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Abstract

Glyphosate-resistant (GR) and glyphosate-tolerant weeds cause considerable yield losses and represent a growing threat to soybean production systems. Despite the relevance of this topic, few studies have evaluated the dispersal of these species in Brazil. The objective of this study was to evaluate the dispersal and frequency of known GR and glyphosate-tolerant weeds in soybean-producing microregions. A total of 2,481 interviews were conducted in different regions of Brazil. The interviews were stratified among 20 edaphoclimatic microregions (ECRs) to cover all of the country’s soybean-producing regions. A minimum number of interviews was estimated to generate a margin of error of ≤10% within the ECRs and ≤5% in the country. The values of the farmers’ responses were extrapolated to the total soybean production area of each ECR and the country as a whole, and the absolute values of each response were normalized as percentage values. The dispersal and management data demonstrate a loss of efficiency of glyphosate-resistance technology. Species that are naturally tolerant to glyphosate such as goosegrass, Commelina spp., and Ipomoea spp. had a greater presence in the ECRs, as did the resistant biotypes, particularly Conyza spp. and sourgrass, due to the large area cultivated with GR soybean, where glyphosate has been used with high frequency.

Keywords

Daniel Stephenson, Louisana State University Agricultural CenterGlyphosatedayflower species, Commelina spp.goosegrass, Eleusine indica (L.) Gaertn.horseweed, Conyza sppmorningglory species, Ipomoea sppsourgrass, Digitaria insularis (L.) Mez ex Ekmansoybean, Glycine max (L.) MerrInterferenceresistancesoybean macroregionweed mappingyield
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 1 , February 2019 , pp. 217 - 231
Copyright
© Weed Science Society of America, 2019. 

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Footnotes

Cite this article: Lucio FR, Kalsing A, Adegas FS, Rossi CVS, Correia NM, Gazziero DLP, da Silva AF (2019) Dispersal and frequency of glyphosate-resistant and glyphosate-tolerant weeds in soybean-producing edaphoclimatic microregions in Brazil. Weed Technol 33:217–231. doi: 10.1017/wet.2018.97

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