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←Use the dropdown list in yellow to filter by country! This table lists all herbicide resistant weeds by site of action.  Red indicates that the weed species has evolved resistance to the site of action.  If you want to change the headers from HRAC classification to WSSA or Australian classifications then click on the buttons below.
Herbicide Resistance Action Comittee Global Standard -See Classification Here	Weed Science Society of America Used in North  America -See Classification Here	Australian Herbicide Groups See Classification Here

Global Summary you can select by country in yellow box Herbicide Resistant Weeds by Species and Site of Action *****HRAC Group Codes***** Click Headers to Sort Data. Data Current as of : Tuesday, November 4, 2025

	Species	Total	A	B	C1	C2	D	G	K1	O	F2	Other
130	Poa annua	10	1	1			1	1	1			5
112	Lolium rigidum	9	1	1			1	1	1			4
14	Amaranthus palmeri	7		1				1	1	1	1	2
28	Avena fatua	7	1	1				1	1			3
79	Echinochloa crus-galli var. crus-galli	7	1	1				1	1	1	1	1
81	Eleusine indica	7	1	1			1	1	1			2
110	Lolium perenne ssp. multiflorum	6	1	1			1	1				2
12	Amaranthus hybridus (syn: quitensis)	5		1				1		1		2
16	Amaranthus retroflexus	5		1				1			1	2
219	Amaranthus tuberculatus (=A. rudis)	5		1				1		1	1	1
21	Arctotheca calendula	5		1			1	1		1		1
65	Conyza sumatrensis	5		1			1	1		1		1
78	Echinochloa colona	5	1	1				1		1		1
111	Lolium perenne	5	1	1				1				2
141	Raphanus raphanistrum	5		1				1		1	1	1
6	Alopecurus myosuroides	4	1	1				1	1			0
18	Ambrosia artemisiifolia	4		1				1		1		1
30	Avena sterilis ssp. ludoviciana	4	1	1				1				1
32	Bidens pilosa	4		1			1	1				1
60	Conyza bonariensis	4		1			1	1				1
77	Digitaria sanguinalis	4	1	1				1			1	0
97	Hordeum murinum ssp. glaucum	4	1	1			1	1				0
101	Kochia scoparia	4		1				1		1		1
166	Sorghum halepense	4	1	1				1	1			0
264	Alopecurus aequalis	3	1	1					1			0
5	Alopecurus japonicus	3	1	1			1					0
29	Avena sterilis	3	1	1								1
36	Brassica rapa (=B. campestris)	3		1				1		1		0
197	Bromus diandrus	3	1	1				1				0
40	Bromus tectorum	3	1	1				1				0
61	Conyza canadensis	3		1			1	1				0
237	Descurainia sophia	3		1						1		1
261	Echinochloa oryzoides	3	1	1				1				0
87	Euphorbia heterophylla	3		1				1				1
98	Hordeum murinum ssp. leporinum	3	1				1	1				0
99	Ischaemum rugosum	3	1	1			1					0
102	Lactuca serriola	3		1				1		1		0
220	Plantago lanceolata	3					1	1		1		0
146	Sagittaria montevidensis	3		1						1		1
327	Senecio vernalis	3		1								2
153	Setaria viridis	3	1	1					1			0
159	Sisymbrium orientale	3		1						1		1
164	Sonchus oleraceus	3		1				1		1		0
165	Sorghum bicolor	3	1	1				1				0
13	Amaranthus blitum (ssp. oleraceus)	2		1			1					0
15	Amaranthus powellii	2		1						1		0
278	Amaranthus spinosus	2		1				1				0
184	Ambrosia trifida	2		1				1				0
20	Apera spica-venti	2	1	1								0
31	Beckmannia syzigachne	2	1						1			0
194	Bidens subalternans	2		1				1				0
38	Bromus diandrus ssp. rigidus (=B. rigidus)	2	1	1								0
289	Bromus sterilis	2	1	1								0
348	Carduus acanthoides	2						1		1		0
277	Centaurea cyanus	2		1						1		0
47	Chenopodium album	2		1						1		0
340	Chloris radiata	2		1				1				0
205	Cynosurus echinatus	2	1	1								0
71	Cyperus difformis	2		1								1
76	Daucus carota	2						1		1		0
239	Digitaria insularis	2	1					1				0
177	Digitaria ischaemum	2	1							1		0
304	Echinochloa crus-galli var. formosensis	2	1	1								0
178	Echinochloa phyllopogon (=E. oryzicola)	2	1	1								0
90	Fimbristylis miliacea	2		1						1		0
91	Galeopsis tetrahit	2		1						1		0
272	Galium aparine	2		1						1		0
93	Galium spurium	2		1						1		0
310	Hedyotis verticillata	2					1	1				0
95	Helianthus annuus	2		1				1				0
328	Hirschfeldia incana	2		1						1		0
223	Leptochloa chinensis	2	1								1	0
104	Limnocharis flava	2		1						1		0
226	Limnophila erecta	2		1						1		0
123	Papaver rhoeas	2		1						1		0
124	Parthenium hysterophorus	2		1				1				0
244	Phalaris brachystachys	2	1	1								0
127	Phalaris minor	2	1	1								0
128	Phalaris paradoxa	2	1	1								0
140	Ranunculus acris	2		1						1		0
265	Rottboellia cochinchinensis (=R. exaltata)	2	1	1								0
147	Salsola tragus	2		1				1				0
148	Senecio vulgaris	2		1								1
149	Setaria faberi	2	1	1								0
155	Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)	2	1	1								0
158	Sinapis arvensis	2		1						1		0
190	Solanum ptycanthum	2		1			1					0
168	Stellaria media	2		1						1		0
174	Xanthium strumarium	2		1								1
280	Acalypha australis	1										1
319	Ageratum conyzoides	1		1								0
3	Agrostis stolonifera	1										1
300	Alisma canaliculatum	1		1								0
4	Alisma plantago-aquatica	1		1								0
7	Amaranthus albus	1		1								0
9	Amaranthus blitoides	1		1								0
287	Amaranthus viridis	1		1								0
183	Ammannia auriculata	1		1								0
209	Ammannia coccinea	1		1								0
1360	Ammannia multiflora	1		1								0
268	Anthemis arvensis	1		1								0
19	Anthemis cotula	1		1								0
356	Anthriscus caucalis	1		1								0
292	Arabidopsis thaliana	1		1								0
353	Aster squamatus	1						1				0
213	Bacopa rotundifolia	1		1								0
322	Bifora radians	1		1								0
308	Blyxa aubertii	1		1								0
318	Brachiaria eruciformis	1						1				0
35	Brachypodium distachyon	1	1									0
37	Brassica tournefortii	1		1								0
338	Bromus catharticus	1						1				0
357	Bromus commutatus	1		1								0
246	Bromus japonicus	1		1								0
352	Bromus madritensis	1						1				0
324	Bromus rubens	1						1				0
245	Bromus secalinus	1		1								0
274	Buglossoides arvensis (=Lithospermum arvense)	1		1								0
207	Camelina microcarpa	1		1								0
41	Capsella bursa-pastoris	1		1								0
42	Carduus nutans	1								1		0
43	Carduus pycnocephalus	1								1		0
44	Centaurea solstitialis	1								1		0
334	Centaurea stoebe ssp. micranthos	1								1		0
332	Chamaesyce maculata	1		1								0
53	Chloris barbata = (C. inflate)	1						1				0
316	Chloris elata	1						1				0
262	Chloris truncata	1						1				0
330	Chloris virgata	1						1				0
228	Chrysanthemum coronarium	1		1								0
55	Cirsium arvense	1								1		0
311	Clidemia hirta	1		1								0
56	Commelina diffusa	1								1		0
312	Convolvulus arvensis	1					1					0
66	Crassocephalum crepidioides	1					1					0
271	Crepis tectorum	1		1								0
68	Cuphea carthagenensis	1					1					0
69	Cuscuta pentagona (=C. campestris)	1		1								0
276	Cynodon hirsutus	1						1				0
303	Cyperus brevifolius	1		1								0
329	Cyperus compressus	1		1								0
290	Cyperus esculentus	1		1								0
266	Cyperus iria	1		1								0
317	Cyperus odoratus	1		1								0
74	Damasonium minus	1		1								0
225	Digitaria ciliaris	1	1									0
285	Diplotaxis erucoides	1		1								0
227	Diplotaxis tenuifolia	1		1								0
302	Dopatrium junceum	1		1								0
305	Echinochloa crus-galli var. zelayensis	1								1		0
193	Echinochloa crus-pavonis	1								1		0
236	Echinochloa erecta	1										1
186	Echium plantagineum	1		1								0
315	Ehrharta longiflora	1	1									0
210	Elatine triandra var. pedicellata	1		1								0
295	Eleocharis acicularis	1		1								0
82	Epilobium ciliatum	1					1					0
85	Erigeron philadelphicus	1					1					0
176	Eriochloa punctata	1	1									0
286	Erucaria hispanica	1		1								0
247	Erysimum repandum	1		1								0
191	Fumaria densiflora	1							1			0
339	Galinsoga parviflora	1		1								0
306	Galium tricornutum	1		1								0
298	Gamochaeta pensylvanica	1					1					0
2358	Glebionis segetum	1		1								0
358	Hordeum jubatum	1	1									0
217	Hydrilla verticillata	1										1
229	Iva xanthiifolia	1		1								0
100	Ixophorus unisetus	1		1								0
336	Lactuca saligna	1						1				0
323	Lamium amplexicaule	1		1								0
232	Landoltia punctata	1					1					0
103	Lepidium virginicum	1					1					0
267	Leptochloa panicoides	1	1									0
270	Leptochloa virgata	1						1				0
105	Limnophila sessiliflora	1		1								0
106	Lindernia dubia (=Lindernia dubia var. major)	1		1								0
108	Lindernia micrantha	1		1								0
109	Lindernia procumbens	1		1								0
341	Lithospermum arvense	1		1								0
181	Lolium persicum	1	1									0
309	Ludwigia prostrata	1		1								0
248	Matricaria recutita (= M. chamomilla)	1		1								0
281	Mazus fauriei	1					1					0
296	Mazus pumilus	1					1					0
234	Mesembryanthemum crystallinum	1		1								0
240	Mitracarpus hirtus	1					1					0
118	Monochoria korsakowii	1		1								0
202	Monochoria vaginalis	1		1								0
273	Myosoton aquaticum	1		1								0
169	Nassella neesiana	1										1
221	Nassella trichotoma	1										1
189	Neslia paniculata	1		1								0
242	Oryza sativa var. sylvatica	1		1								0
122	Panicum dichotomiflorum	1		1								0
1359	Panicum miliaceum var. ruderale Kitag.	1		1								0
335	Paspalum paniculatum	1						1				0
231	Pentzia suffruticosa	1		1								0
314	Picris hieracioides	1		1								0
350	Poa trivialis	1		1								0
131	Polygonum aviculare	1										1
88	Polygonum convolvulus (=Fallopia convolvulus)	1		1								0
134	Polygonum lapathifolium	1		1								0
135	Polygonum pensylvanicum	1		1								0
136	Polygonum persicaria	1		1								0
313	Polypogon fugax	1	1									0
224	Raphanus sativus	1		1								0
142	Rapistrum rugosum	1		1								0
282	Rorippa indica	1		1								0
214	Rotala indica var. uliginosa	1		1								0
301	Rotala pusilla	1		1								0
320	Rumex dentatus	1		1								0
349	Rumex obtusifolius	1		1								0
215	Sagittaria guayanensis	1		1								0
230	Sagittaria pygmaea	1		1								0
294	Sagittaria trifolia	1		1								0
307	Schoenoplectus fluviatilis	1		1								0
196	Schoenoplectus juncoides	1		1								0
182	Schoenoplectus mucronatus (=Scirpus mucronatus)	1		1								0
299	Schoenoplectus wallichii	1		1								0
283	Sclerochloa dura	1					1					0
297	Sclerochloa kengiana	1	1									0
351	Secale cereale	1		1								0
150	Setaria pumila (=S. glauca)	1		1								0
157	Sida spinosa	1		1								0
279	Silene gallica	1		1								0
241	Sinapis alba	1		1								0
160	Sisymbrium thellungii	1		1								0
195	Snowdenia polystachya	1	1									0
161	Solanum americanum	1					1					0
162	Solanum nigrum	1					1					0
199	Soliva sessilis	1								1		0
163	Sonchus asper	1		1								0
187	Sorghum bicolor ssp. drummondii (=Sorghum sudanese)	1	1									0
326	Spergula arvensis	1		1								0
167	Sphenoclea zeylanica	1								1		0
325	Sporobolus fertilis	1										1
1358	Steinchisma laxum	1						1				0
204	Thlaspi arvense	1		1								0
333	Tridax procumbens	1						1				0
116	Tripleurospermum perforatum (=T. inodorum)	1		1								0
171	Urochloa panicoides	1						1				0
34	Urochloa plantaginea (=Brachiaria plantaginea)	1	1									0
275	Vaccaria hispanica	1		1								0
321	Vicia sativa	1		1								0
173	Vulpia bromoides	1					1					0
175	Youngia japonica	1					1					0
354	Zea mays ssp. mexicana	1	1									0
1	Abutilon theophrasti	0										0
11	Amaranthus cruentus	0										0
22	Arenaria serpyllifolia	0										0
26	Atriplex patula	0										0
33	Bidens tripartita	0										0
51	Chenopodium album var. striatum (=C. strictum var. glaucophyllum)	0										0
48	Chenopodium ficifolium	0										0
50	Chenopodium polyspermum	0										0
67	Crypsis schoenoides	0										0
75	Datura stramonium	0										0
84	Epilobium tetragonum	0										0
92	Galinsoga ciliata	0										0
355	Leptochloa fusca spp. fasicularis	0										0
291	Leptochloa scabra	0										0
115	Matricaria discoidea	0										0
121	Panicum capillare	0										0
129	Plantago lagopus	0										0
133	Polygonum hydropiper	0										0
137	Polypogon monspeliensis	0										0
138	Portulaca oleracea	0										0
114	Rostraria smyrnacea (=Lophochloa smyrnacea)	0										0
337	Rumex acetosella	0										0
152	Setaria verticillata	0										0
222	Urtica urens	0										0

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, November 4, 2025 .  Available  www.weedscience.org
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