Herbicide Resistant Weeds by Year and Site of Action (This data can be used to make the species x SOA x year resistance graph) : Tuesday, April 16, 2024

Year	Total	A	B	C1	C2	D	G	K1	O	F2	Other
1957	2	0	0	0	0	0	0	0	2	0	0
1970	2	0	0	0	0	0	0	0	2	0	0
1972	2	0	0	0	0	0	0	0	2	0	0
1973	3	0	0	0	0	0	0	1	2	0	0
1975	3	0	0	0	0	0	0	1	2	0	0
1976	3	0	0	0	0	0	0	1	2	0	0
1977	3	0	0	0	0	0	0	1	2	0	0
1978	3	0	0	0	0	0	0	1	2	0	0
1979	4	0	0	0	0	0	0	1	3	0	0
1980	7	0	0	0	0	3	0	1	3	0	0
1981	9	0	0	0	0	4	0	1	4	0	0
1982	15	2	1	0	0	5	0	2	4	0	1
1983	17	2	1	0	0	5	0	2	5	0	2
1984	21	2	2	0	0	7	0	2	5	0	3
1985	25	3	2	0	0	8	0	2	6	0	4
1986	29	3	3	0	0	10	0	2	6	0	5
1987	34	4	6	0	0	10	0	3	6	0	5
1988	41	4	8	0	0	11	0	4	8	0	6
1989	50	5	11	0	0	13	0	5	9	0	7
1990	60	6	13	0	0	18	0	6	10	0	7
1991	67	9	15	0	0	20	0	6	10	0	7
1992	73	10	18	0	0	20	0	8	10	0	7
1993	92	12	32	0	0	21	0	8	11	0	8
1994	100	13	37	0	0	21	0	8	12	0	9
1995	106	13	41	0	0	21	0	8	13	0	10
1996	125	17	54	0	0	21	1	8	14	0	10
1997	140	20	63	0	0	21	2	9	15	0	10
1998	151	22	69	0	0	21	2	9	17	0	11
1999	163	26	73	0	0	21	2	10	20	0	11
2000	176	29	81	0	0	21	3	10	21	0	11
2001	185	31	85	0	0	22	4	10	21	0	12
2002	195	33	88	0	0	23	4	10	23	0	14
2003	198	33	89	0	0	23	6	10	23	0	14
2004	214	33	98	0	0	23	9	11	23	0	17
2005	234	35	105	0	0	24	14	11	25	0	20
2006	239	35	109	0	0	25	14	11	25	0	20
2007	251	36	116	0	0	26	16	11	26	0	20
2008	257	36	119	0	0	26	19	11	26	0	20
2009	275	40	125	0	0	27	20	11	27	2	23
2010	294	43	133	0	0	28	25	12	27	2	24
2011	312	43	140	0	0	31	26	12	28	2	30
2012	325	44	149	0	0	31	28	12	29	2	30
2013	332	44	153	0	0	31	29	12	31	2	30
2014	351	47	160	0	0	31	34	12	32	2	33
2015	368	47	162	0	0	32	38	12	36	3	38
2016	376	48	162	0	0	32	41	12	39	3	39
2017	387	49	164	0	0	32	43	12	40	3	44
2018	395	49	166	0	0	32	49	12	40	3	44
2019	405	49	169	0	0	32	54	12	42	3	44
2020	412	50	172	0	0	32	55	12	42	3	46
2021	416	50	172	0	0	32	57	12	42	3	48
2022	423	51	173	0	0	33	58	12	43	4	49
2023	427	51	174	0	0	33	59	12	44	5	49

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, April 16, 2024 .  Available  www.weedscience.org
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