International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Status of Herbicide Resistance in United Kingdom - Stephen Moss : January, 2015

Alopecurus myosuroides (black-grass) is the major herbicide-resistant weed problem and, by 2013, occurred on virtually all of the estimated 20,000 farms in 35 counties where herbicides are applied regularly for its control. Resistance to mesosulfuron + iodosulfuron, first used in the UK in autumn 2003, has now been detected on >700 farms in 27 counties in England. Resistance is conferred by both ALS target site (Pro-197 & Trp-574 mutations) and non-target site mechanisms. Resistant Lolium multiflorum (Italian rye-grass) occurs on >475 farms in 33 counties and resistant Avena spp. (wild-oats) on >250 farms in 28 counties of England. The first cases of ALS target site resistance (Pro-197) in UK populations of L. multiflorum were detected in 2012. ALS-resistant Stellaria media (common chickweed) was found on >50 farms in 13 counties in England, Scotland and Northern Ireland and ALS-resistant Papaver rhoeas (common poppy) on >40 farms in nine counties of England. ALS-resistant Tripleurospermum inodorum (scentless mayweed) was found on five farms in three counties (Yorkshire, Norfolk and Angus). These included the first recorded case in Scotland where the ALS mutation responsible (Pro-197-Gln) was determined, making this the first UK population of Tripleurospermum inodorum to have ALS target site resistance confirmed.

Herbicide Resistant Weeds in United Kingdom
Herbicide Resistant Weeds in United Kingdom
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Herbicide Resistant Weeds in United Kingdom
#SpeciesCommon NameFirst YearSite of Action
1 Senecio vulgarisCommon GroundselUnited Kingdom 197744 PSII inhibitors - Serine 264 Binders (C1 C2/5)
365
2 Poa annuaAnnual BluegrassUnited Kingdom 198144 PS I Electron Diversion (D/22)
359
3 Epilobium ciliatumFringed WillowherbUnited Kingdom 198144 PSII inhibitors - Serine 264 Binders (C1 C2/5)
363
4 Poa annuaAnnual BluegrassUnited Kingdom 198144 PSII inhibitors - Serine 264 Binders (C1 C2/5)
366
5 Alopecurus myosuroidesBlackgrassUnited Kingdom 198244 Inhibition of Acetyl CoA Carboxylase (A/1)
357
6 Conyza canadensisHorseweedUnited Kingdom 198244 PSII inhibitors - Serine 264 Binders (C1 C2/5)
362
7 Alopecurus myosuroidesBlackgrassUnited Kingdom 198244 PSII inhibitors - Serine 264 Binders (C1 C2/7)
507
8 Solanum nigrumBlack NightshadeUnited Kingdom 198344 PSII inhibitors - Serine 264 Binders (C1 C2/5)
364
9 Alopecurus myosuroidesBlackgrassUnited Kingdom 198444 Inhibition of Acetolactate Synthase (B/2)
323
10 Stellaria mediaCommon ChickweedUnited Kingdom 198544 Auxin Mimics (O/4)
358
11 Alopecurus myosuroidesBlackgrassUnited Kingdom 198744 Inhibition of Microtubule Assembly 2 (K1/3)
329
12 Arabidopsis thalianaMouse-ear CressUnited Kingdom 198844 PSII inhibitors - Serine 264 Binders (C1 C2/5)
7762
13 Epilobium ciliatumFringed WillowherbUnited Kingdom 198944 PS I Electron Diversion (D/22)
360
14 Chenopodium albumCommon LambsquartersUnited Kingdom 198944 PSII inhibitors - Serine 264 Binders (C1 C2/5)
361
15 Matricaria discoideaPineapple-weedUnited Kingdom 198944 PSII inhibitors - Serine 264 Binders (C1 C2/5)
367
16 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 199044 Inhibition of Acetyl CoA Carboxylase (A/1)
356
17 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 199044 PSII inhibitors - Serine 264 Binders (C1 C2/7)
5080
18 Avena sterilisSterile OatUnited Kingdom 199344 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase (A/1)
Inhibition of Acetolactate Synthase (B/2)
Antimicrotubule mitotic disrupter (Z/25)
354
19 Avena fatuaWild OatUnited Kingdom 199444 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase (A/1)
Inhibition of Acetolactate Synthase (B/2)
Antimicrotubule mitotic disrupter (Z/25)
355
20 Stellaria mediaCommon ChickweedUnited Kingdom 200044 Inhibition of Acetolactate Synthase (B/2)
5088
21 Papaver rhoeasCorn PoppyUnited Kingdom 200144 Inhibition of Acetolactate Synthase (B/2)
5169
22 Tripleurospermum perforatum (=T. inodorum)Scentless ChamomileUnited Kingdom 200244 Inhibition of Acetolactate Synthase (B/2)
7763
23 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 201244 Inhibition of Acetolactate Synthase (B/2)
10968
24 Sonchus asperSpiny SowthistleUnited Kingdom 201644 Inhibition of Acetolactate Synthase (B/2)
18185
25 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 201844 Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/15)
17153
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 20, 2021 .  Available  www.weedscience.org
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