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Glyphosate‐resistant weeds of South American cropping systems: an overview
Author(s) -
VilaAiub Martin M,
Vidal Ribas A,
Balbi Maria C,
Gundel Pedro E,
Trucco Frederico,
Ghersa Claudio M
Publication year - 2008
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1488
Subject(s) - glyphosate , biology , agronomy , weed , resistance (ecology) , agroecosystem , weed control , herbicide resistance , cropping , cropping system , pesticide resistance , crop , lolium rigidum , agriculture , agroforestry , pesticide , ecology
Abstract Herbicide resistance is an evolutionary event resulting from intense herbicide selection over genetically diverse weed populations. In South America, orchard, cereal and legume cropping systems show a strong dependence on glyphosate to control weeds. The goal of this report is to review the current knowledge on cases of evolved glyphosate‐resistant weeds in South American agriculture. The first reports of glyphosate resistance include populations of highly diverse taxa ( Lolium multiflorum Lam., Conyza bonariensis L., C. canadensis L.). In all instances, resistance evolution followed intense glyphosate use in fruit fields of Chile and Brazil. In fruit orchards from Colombia, Parthenium hysterophorus L. has shown the ability to withstand high glyphosate rates. The recent appearance of glyphosate‐resistant Sorghum halepense L. and Euphorbia heterophylla L. in glyphosate‐resistant soybean fields of Argentina and Brazil, respectively, is of major concern. The evolution of glyphosate resistance has clearly taken place in those agroecosystems where glyphosate exerts a strong and continuous selection pressure on weeds. The massive adoption of no‐till practices together with the utilization of glyphosate‐resistant soybean crops are factors encouraging increase in glyphosate use. This phenomenon has been more evident in Argentina and Brazil. The exclusive reliance on glyphosate as the main tool for weed management results in agroecosystems biologically more prone to glyphosate resistance evolution. Copyright © 2007 Society of Chemical Industry