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 Inhibition of Acetolactate Synthase (B/2)
 		169
2 Chenopodium albumCommon LambsquartersPortugal 200334 PSII inhibitors - Serine 264 Binders (C1 C2/5)
 		5227
3 Conyza bonariensisHairy FleabanePortugal 201034 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
 		5539
4 Conyza canadensisHorseweedPortugal 201134 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
 		7824
5 Lolium perennePerennial RyegrassPortugal 201334 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
 		7825
6 Echinochloa phyllopogon (=E. oryzicola)Late WatergrassPortugal 201534 Inhibition of Acetolactate Synthase (B/2)
 		27294
7 Echinochloa crus-galli var. crus-galliBarnyardgrassPortugal 201534 Inhibition of Acetolactate Synthase (B/2)
 		28264
8 Echinochloa crus-galli var. crus-galliBarnyardgrassPortugal 201834 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
 		28265
9 Papaver rhoeasCorn PoppyPortugal 201834 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Auxin Mimics (O/4)
 		28267
10 Papaver rhoeasCorn PoppyPortugal 201834 Inhibition of Acetolactate Synthase (B/2)
 		28271
11 Lolium perenne ssp. multiflorumItalian RyegrassPortugal 201934 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
 		28266
12 Echinochloa phyllopogon (=E. oryzicola)Late WatergrassPortugal 202034 Inhibition of Acetyl CoA Carboxylase (A/1)
 		28268
13 Echinochloa phyllopogon (=E. oryzicola)Late WatergrassPortugal 202034 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase (A/1)
Inhibition of Acetolactate Synthase (B/2)
 		28269
14 Cyperus difformisSmallflower Umbrella SedgePortugal 202334 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
PSII inhibitors - Histidine 215 Binders (C3/6)
 		28270
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 24, 2025 .  Available  www.weedscience.org
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