International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Portugal - Isabel Calha : January, 2014

In Portugal the most serious problems with herbicide resistance are the recent cases of glyphosate resistance in perennial crops.

Herbicide Resistant Weeds in Portugal
Herbicide Resistant Weeds in Portugal
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Herbicide Resistant Weeds in Portugal
#SpeciesCommon NameFirst YearSite of Action
1 Alisma plantago-aquaticaCommon WaterplantainPortugal 199534 ALS inhibitors (B/2)
 		169
2 Chenopodium albumCommon LambsquartersPortugal 200334 Photosystem II inhibitors (C1/5)
 		5227
3 Conyza bonariensisHairy FleabanePortugal 201034 EPSP synthase inhibitors (G/9)
 		5539
4 Conyza canadensisHorseweedPortugal 201134 EPSP synthase inhibitors (G/9)
 		7824
5 Lolium perennePerennial RyegrassPortugal 201334 EPSP synthase inhibitors (G/9)
 		7825
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