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 Photosystem II inhibitors (C1/5)
365
2 Poa annuaAnnual BluegrassUnited Kingdom 198144 PSI Electron Diverter (D/22)
359
3 Epilobium ciliatumFringed WillowherbUnited Kingdom 198144 Photosystem II inhibitors (C1/5)
363
4 Poa annuaAnnual BluegrassUnited Kingdom 198144 Photosystem II inhibitors (C1/5)
366
5 Alopecurus myosuroidesBlackgrassUnited Kingdom 198244 ACCase inhibitors (A/1)
357
6 Conyza canadensisHorseweedUnited Kingdom 198244 Photosystem II inhibitors (C1/5)
362
7 Alopecurus myosuroidesBlackgrassUnited Kingdom 198244 PSII inhibitor (Ureas and amides) (C2/7)
507
8 Solanum nigrumBlack NightshadeUnited Kingdom 198344 Photosystem II inhibitors (C1/5)
364
9 Alopecurus myosuroidesBlackgrassUnited Kingdom 198444 ALS inhibitors (B/2)
323
10 Stellaria mediaCommon ChickweedUnited Kingdom 198544 Synthetic Auxins (O/4)
358
11 Alopecurus myosuroidesBlackgrassUnited Kingdom 198744 Microtubule inhibitors (K1/3)
329
12 Arabidopsis thalianaMouse-ear CressUnited Kingdom 198844 Photosystem II inhibitors (C1/5)
7762
13 Epilobium ciliatumFringed WillowherbUnited Kingdom 198944 PSI Electron Diverter (D/22)
360
14 Chenopodium albumCommon LambsquartersUnited Kingdom 198944 Photosystem II inhibitors (C1/5)
361
15 Matricaria discoideaPineapple-weedUnited Kingdom 198944 Photosystem II inhibitors (C1/5)
367
16 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 199044 ACCase inhibitors (A/1)
356
17 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 199044 PSII inhibitor (Ureas and amides) (C2/7)
5080
18 Avena sterilisSterile OatUnited Kingdom 199344 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Antimicrotubule mitotic disrupter (Z/25)
354
19 Avena fatuaWild OatUnited Kingdom 199444 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Antimicrotubule mitotic disrupter (Z/25)
355
20 Stellaria mediaCommon ChickweedUnited Kingdom 200044 ALS inhibitors (B/2)
5088
21 Papaver rhoeasCorn PoppyUnited Kingdom 200144 ALS inhibitors (B/2)
5169
22 Tripleurospermum perforatum (=T. inodorum)Scentless ChamomileUnited Kingdom 200244 ALS inhibitors (B/2)
7763
23 Lolium perenne ssp. multiflorumItalian RyegrassUnited Kingdom 201244 ALS inhibitors (B/2)
10968
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 18, 2017 .  Available  www.weedscience.org
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